Click Beetles

in $. Hind margin of prosternum with a rounded lobe. Black or brown. 7.5-8.5 mm.

Two very rare species of cerophytids occur in the U.S., one in the East and the other in California; they live under bark and in rotting wood.

CEBRIONID BEETLES Family Cebrionidae

Identification: Body elongate, broadest at base of FW. Mandibles large, thin, projecting forward in front of head. Abdomen 6-segmented. Brownish, with long, dense, suberect pubescence. 15-25 mm.

Most of the 17 species of cebrionids in the U.S. occur in the Southwest. They are found under bark, on the ground, and beneath objects, and are nocturnal. Males are good fliers, with wasplike flight; females are wingless and live in the ground Larvae live in or on the ground and feed on roots.


Identification: Similar to Elateridae (p. 166), but pronotum somewhat stouter and more convex above, anterior margin of prosternum straight across (not lobed), and prothorax more firmly attached to mesothorax, with little capacity for movement. Antennae serrate, pectinate, or flabellate, often fitting into prosternal grooves. Brown or black, sometimes with pale markings. 3-18 mm.

About 70 species of eucnemids occur in N. America, but they are infrequently collected. They are found on foliage, under bark, and in or on rotten wood (especially beech and maple). Adults quiver their antennae continuously (a habit not found in Elateridae). Larvae feed in rotting wood.

PEROTHOPID BEETLES Family Perothopidae Not illus. Identification: Similar to Eucnemidae, but tarsal claws pectinate and prothorax loosely attached to mesothorax. Prosternum narrowly lobed anteriorly. Brownish. 10-18 mm.

Perothopids are rare beetles living on the trunks and branches of old beech trees. The 3 U.S. species occur from Pennsylvania to Florida and in California.

THROSCID BEETLES Family Throscidae Identification: Similar to Elateridae (p. 166), but body more compact (broadest near base of FW), and prosternal lobe firmly attached to mesothorax and not movable. Antennae serrate or with a loose 3-segmented club. Brown or black, sometimes with pale markings. 2-5 mm.

Adults of this small family occur on flowers and vegetation but are not common. Larvae are found in worm-eaten wood, and are probably predaceous.

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