| Chrysotoxum flavifrons | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Diptera |
| Family: | Syrphidae |
| Genus: | Chrysotoxum |
| Species: | C. flavifrons |
| Binomial name | |
| Chrysotoxum flavifrons Macquart, 1842 | |
| Synonyms | |
| |
Chrysotoxum flavifrons, the Blackshield Meadow Fly, is a species of North American hoverfly. They are wasp mimics.
For terminology Speight key to genera and glossary
external link to inaturalist images
The proportions of the three antennal segments are about 3:3:10 In males the frons, has no strong swelling, and upper eye facets that are larger. The male eye has long pile, while it is shorter in females. The face is yellow pollinose with a middle vitta that is broad black to brown median, and a tubercle that is low near the lower margin. The frons is black with lateral yellow stripes.
The hairs of the scutum is are black and yellow.. In females, the scutellar hairs are long and dense, and those on the anterior half are not distinctly shorter than those on the posterior half. The hairs of the notopleuron are always partly black, while the hairs of the anepimeron are mostly or entirely black. Other pleural hairs are mostly yellow. The anterior anepisternum typically has 5 to 15 long, fine, erect pale hairs on the lower half, but may have fewer hairs or be bare. The proepimeron is black in color, while the katepisterum is black or obscurely yellowish near the upper margin. The katatergite is black or extensively yellowish. The anepisternum usually has five to 15 hairs on the lower half, but may have fewer hairs or be bare. The katepisternum is black or has an obscure dull yellow spot near the upper margin. Finally, the lateral notopleural hairs and anepimeral hairs are black in color.
The abdominal margins extend beyond the middle of the second tergite and are yellow. The posterolateral angles of tergites 3 and 4 are strongly pointed, with that of tergite 4 being subacute. Tergite 2 has a posterior margin that is black, except laterally in some specimens. The yellow bands on tergites 3 and 4 are divided, and tergite 5 has a black inverted Y that is wider than it is long. Sternite 2 has a bright yellow posterior margin, while sternite 3 has a pair of yellow spots on the anterior half. The surstylus in this species is rather broad and almost evenly tapered from base to apex.
The wing vein R4+5 in this species is clearly dipped into cell r4+5. The cell bm typically has a distinct bare median stripe but can rarely be entirely trichose. Additionally, the front edge of the wing is brown.
The legs are yellow in color and have black coxae, trochanters, and bases of the femora. The tabia 3 is slightly curved, while the tarsa are brownish yellow. [1] [2]
Canada and United States from the following states and provinces: Yukon, B.C., Nova Scotia, Ontario, New Brunswick, Alberta, Montana, Indiana, Maine, Alaska, California, New Mexico, Colorado, Illinois, Iowa, and Idaho. [1]
Didea, the lucent flies is a holarctic genus of black and yellow large sized flies 10–15 mm (0.39–0.59 in). belonging to the hoverfly family of Diptera. The larvae feed on aboreal aphids.
Parasyrphus is a genus of hover fly found in the holarctic area of the world including species like Parasyrphus tarsatus located in some very northern areas. Very few of the 31 identified species have known larvae. Of the known larvae most are predators of tree aphids with one, Parasyrphus nigritarsis, that feed on beetle eggs and larvae.
Platycheirus immarginatus, the Comb-legged Sedgesitter, is a common species of hoverfly. It is found in parts of northern Europe and northern North America.
Toxomerus geminatus (Say,1823) the Eastern Calligrapher, is a common species of syrphid fly observed in the eastern and central United States and Canada.(see map) Syrphid flies are also known as Hover Flies or Flower Flies because the adults are frequently found hovering around flowers from which they feed on nectar and pollen. Adults are 6.1–7.6 mm (0.24–0.30 in) long. The larvae are predators of a variety of aphids and mites.
Toxomerus politus is a species of hoverfly. It is known from North, Central and South America. Although little is known about the early stages of this species, associations with corn have been noted. The adults and likely the larvae feed on the pollen of the corn plants.
Brachyopa flavescens, The Yellow Sapeater, is a fairly common species of syrphid fly. It has been observed in northeastern North America. Hoverflies get their names from the ability to remain nearly motionless while in flight. The adults are also known as flower flies for they are commonly found around and on flowers, from which they get both energy-giving nectar and protein-rich pollen. Larvae for this genus are of the rat-tailed type. B.flavescens larvae have not been described.
Helophilus fasciatus, the narrow-headed marsh fly, is an abundant species of syrphid fly observed throughout the United States and Canada. Hoverflies can remain nearly motionless in flight. The adults are also known as flower flies for they are commonly found on flowers, from which they get both energy-giving nectar and protein-rich pollen. The larvae of this genus are associated with wet decaying organic material, particularly accumulations of decaying vegetation in ponds and mud and farmyard manure or silage. The adults of this species lays eggs on vegetation overhanging the water. The larvae hatch and drop into the water.
Helophilus lapponicus, the Yellow-margined Marsh Fly, is a common species of syrphid fly observed across northern North America, northern Europe, Greenland and Siberia. Hoverflies can remain nearly motionless in flight. The adults are also known as flower flies for they are commonly found on flowers, from which they get both energy-giving nectar and protein-rich pollen. Though common the larvae of this species are not known but the larvae of other species in this genus are associated with wet decaying organic material, particularly accumulations of decaying vegetation in ponds and mud and are a so called rat-tailed type.
Syrphus knabi, the The Eastern flower Fly, is an uncommon species of syrphid fly observed in the eastern and United States and Canada. Syrphid flies are also known as Hover Flies or Flower Flies because the adults are frequently found hovering around flowers from which they feed on nectar and pollen. Adults are 7.2–12.9 mm (0.28–0.51 in) long. The larvae are predators of a variety of aphids in trees.
Arctosyrphus willingii, the northern longbeak, is a species of rat-tail maggot fly in the family Syrphidae. This species was formerly a member of the genus Lejops.
'Dasysyrphus intrudens' is a placeholder name for a complex of species that have yet to be properly been divided into individual species. It is found in the Holarctic realm. Though this species actually a complex, it is commonly found in many areas of its range, but yet the larvae of this species were not known to science as of 2012. This may be due to the probable nocturnal habit of these larvae if it is similar to some known larvae of this genus.
Brachyopa daeckei, the black-tailed sapeater, is a rare species of syrphid fly that has been observed in northeastern North America. Hoverflies get their names from the ability to remain nearly motionless while in flight. The adults are also known as flower flies for they are commonly found around and on flowers, from which they get both energy-giving nectar and protein-rich pollen. Larvae for this genus are of the rat-tailed type. B.daeckei larvae have not been described.
Blera scitula, the Western Wood Fly, is an uncommon species of syrphid fly first officially described by Williston in 1882. Hoverflies get their names from the ability to remain nearly motionless while in flight. The adults are also known as flower flies, for they are commonly found around and on the flowers from which they get both energy-giving nectar and protein-rich pollen. The larvae of Blera are of the rat-tailed type, feeding on exuding sap or in the rot holes of trees.
'Blera metcalfi , Metcalf's wood fly, is a rare species of syrphid fly first officially described by Curran in 1925 Hoverflies get their name from the ability to remain nearly motionless while in flight. The adults are also known as flower flies for they are commonly found around and on flowers from which they get both energy-giving nectar and protein rich pollen. The larvae are of the rat-tailed type feeding on exuding sap or in the rot holes of trees.
Sphegina cultrigera is a species of hoverfly in the family Syrphidae found in Kambaiti Pass, Myanmar, a montane forest with swampy areas and streams located 2000 meters above sea level.
Brachyopa caesariata, the Plain-winged Sapeater, is an uncommon species of syrphid fly. It has been observed in Canada, Alaska and northern United States. Hoverflies get their names from the ability to remain nearly motionless while in flight. The adults are also known as flower flies for they are commonly found around and on flowers, from which they get both energy-giving nectar and protein-rich pollen. Larvae for this genus are of the rat-tailed type. B.caesariata larvae have not been described.
Brachyopa cinereovittata, the Grey-striped Sapeater, is a rare species of syrphid fly. It has been observed in northwestern North America. Hoverflies get their names from the ability to remain nearly motionless while in flight. The adults are also known as flower flies for they are commonly found around and on flowers, from which they get both energy-giving nectar and protein-rich pollen. Larvae for this genus are of the rat-tailed type. B.cinereovittata larvae have not been described.
Brachyopa diversa , the Pale-striped Sapeater, is a rare species of syrphid fly. It has been observed in the northeastern part of North America. Hoverflies get their names from the ability to remain nearly motionless while in flight. The adults are also known as flower flies for they are commonly found around and on flowers, from which they get both energy-giving nectar and protein-rich pollen. Larvae for this genus are of the rat-tailed type. B.diversa larvae have not been described.
Sphiximorpha willistoni, or Williston's wasp fly, is a rare species of syrphid fly found in eastern North America. It is a strong wasp mimic. Hoverflies can remain nearly motionless in flight. The adults are also known as flower flies for they are commonly found on flowers, from which they get both energy-giving nectar and protein-rich pollen. Larvae in this genus are found in sap runs of trees.
Sphaerophoria bifurcata, the symmetric globetail, is a species of syrphid fly in the family Syrphidae. The larvae of this genus are predators of aphids and other small hymenoptera. The larvae of this particular species is not known.
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