The rain beetles are a group of beetles found in the far west of North America. They spend most of their lives underground, emerging in response to rain or snow, thus the common name. Formerly classified in the Geotrupidae, they are currently assigned to their own family Pleocomidae, considered the sister group to all the remaining families of Scarabaeoidea. The family contains a single extant genus, Pleocoma, and two extinct genera, Cretocoma, described in 2002 from Late Cretaceous deposits in Mongolia, and Proteroscarabeus of Late Cretaceous China.
Ochodaeidae, also known as the sand-loving scarab beetles, is a small family of scarabaeiform beetles occurring in many parts of the world.
The family Archeocrypticidae is a small group of beetles with no vernacular common name, though recent authors have coined the name cryptic fungus beetles. Adults and larvae seems to be saprophagous and are often found in plant litter. Worldwide, about 10 genera and 50 species are found, most species are pantropical. Enneboeus caseyi has been recorded from the American South, Central America, and Mexico. About 20 species are found in Australia, in the genera Enneboeus and Australenneboeus.
Pachybrachis is a genus of scriptured leaf beetles in the family Chrysomelidae. There are at least 220 described species in Pachybrachis.
Glaphyridae is a family of beetles, commonly known as bumble bee scarab beetles. There are eight extant genera with about 80 species distributed worldwide and two extinct genera described from the fossil record of China.
Ataenius is a genus of aphodiine dung beetles in the family Scarabaeidae. There are at least 290 described species in Ataenius.
Smicronyx is a genus of snout and bark beetles in the family Curculionidae. There are at least 70 described species in Smicronyx.
Mordellina is a genus of tumbling flower beetles in the family Mordellidae.
Hoplia is a genus of monkey beetles in the family Scarabaeidae. There are at least 300 described species in Hoplia.
Cremastocheilus is a genus of fruit and flower chafers in the family Scarabaeidae. There are at least 40 described species in Cremastocheilus.
Cymatodera is a genus of checkered beetles in the family Cleridae. There are at least 70 described species in Cymatodera.
Epuraea is a genus of sap-feeding beetles in the family Nitidulidae. There are at least 40 described species in Epuraea.
Lioligus is a genus of pill beetles in the family Byrrhidae. There are at least 2 described species in Lioligus.
Plateros is a genus of net-winged beetles in the family Lycidae. There are at least 30 described species in Plateros.
Serica is a genus of from the group of May beetles and junebugs in the family Scarabaeidae. There are at least 100 described species in Serica.
Mycterus is a genus of palm and flower beetles in the family Mycteridae. There are about six described species in Mycterus.
Podabrus is a genus of soldier beetles in the family Cantharidae. There are at least 110 described species in Podabrus.
Tytthonyx is a genus of soldier beetles in the family Cantharidae. There are about 13 described species in Tytthonyx.
Nicagus is a genus of stag beetles in the family Lucanidae. There are at least three described species in Nicagus.
Cordylospasta is a genus of blister beetles in the family Meloidae. There are at least two described species in Cordylospasta.
