Wrinkled Bark Beetle

them well fitted for their predaceous habits. They must be handled carefully when caught, because some can administer a painful bite. The larvae construct vertical tunnels in the ground; they wait at the top of tunnel for passing insects and feed on those they manage to subdue. About % the 130 or so species in N. America belong to the genus Cicindela.

GROUND BEETLES Family Carabidae See also Pl. 5

Identification: Head at eyes nearly always narrower than pro-notum. Antennae inserted between eyes and base of mandibles. Legs usually long, slender. Generally black and shiny or dark, sometimes brightly colored. 2-35 (mostly 5-15) mm.

This is one of the largest families of beetles, and its members are probably as common and abundant — at least in the East — as any other beetles. Carabids are generally found on the ground beneath objects; some are found on vegetation and flowers. They commonly fly to lights. Most species are nocturnal, and hide during the day. They often run rapidly when disturbed, and seldom fly. Larvae usually occur in the same situation as adults. Adults and larvae are nearly always predaceous and many are very beneficial — they feed on some of our worst pests, including Gypsy Moth larvae, cankerworms, and cutworms. The species of Calosoma are called caterpillar hunters; adults and larvae often climb trees or shrubs in search of prey. Many ground beetles give off an unpleasant odor when handled. Brachinus species are called bombardier beetles because of their habit of ejecting from the anus a glandular secretion that literally explodes when released, producing a popping sound. This secretion is foul-smelling and irritating, and serves as a means of protection.

ROUND SAND BEETLES Family Omophronidae

Identification: Shape and size distinctive: oval, tapering at each end, very convex, 5-8 mm. Head large. Scutellum apparently absent. Brown or black, with light markings. Prosternum enlarged between coxae, concealing mesosternum.

The infrequently collected beetles of this small family occur in burrows in sand or mud along shores of streams and lakes. Throwing water over the banks forces them into the open, where they are easily collected. Larvae occur in similar situations; larvae and adults are predaceous.

CRAWLING WATER BEETLES Family Haliplidae Identification v Shape and size distinctive: oval, tapering at each end, convex, 2.5-4.5 mm. Hind coxae greatly enlarged and concealing 2 or more abdominal segments. Yellow or brownish, with black spots. Head small. Antennae short.

These beetles are fairly common in or around ponds, streams,

0 0

Post a comment