Longhorned Beetlessee also Pl

Family Cerambycidae

Identification: Antennae nearly always at least half as long as body, often longer. Body usually elongate and cylindrical. Eyes generally notched, antennae often rising in notch. 3-50 mm. Chrysomelidae (p. 198) are similar and have similar tarsi but differ as follows: antennae nearly always less than half as long as body; rarely over 12 mm.; generally oval in shape; eyes usually oval.

This is a very large family of about 1200 N. American species which includes many attractive and brightly colored beetles. Larvae of most species feed on solid tissues of dead or dying plants, in trunks and branches of fallen or cut trees and shrubs. Many species are very destructive to trees and cut logs.

Subfamily Prioninae. These beetles differ from other ceram-bycids in having the prothorax sharply margined laterally. Members of the genus Prionus are broad and somewhat flattened, brownish or black, and are among the largest of our cerambycids (some nearly 3 in.). Beetles in the genus Parandra are called aberrant long-horned beetles; they have short antennae that extend only to about the middle of the pronotum, and the 4th tarsal segment is large enough to be seen easily; larvae bore in heartwood.

Subfamily Lamiinae (see also PI. 7). The last segment of the maxillary palps is cylindrical and pointed apically. The genus Saperda contains important pest species, and some are strikingly colored. The Roundheaded Apple Tree Borer, S. Candida Fabricius, is light brown, with 2 white stripes; the larva bores in apple and other trees. The Elm Borer (PI. 7), S. tridentata Olivier, is gray, attractively marked with orange; the larva bores under bark of dead and dying elms. Sawyer beetles (Monochamus) are usually 1 in. or more and black or mottled gray; antennae are sometimes twice as long as the body; larvae bore in freshly cut evergreens.

Subfamily Lepturinae (see also PI. 7). The last segment of the maxillary palps is blunt apically. Lepturinae usually have oval or only slightly notched eyes, and Cerambycinae usually have distinctly notched eyes, partly surrounding bases of the antennae. Most Lepturinae have the elytra (FW) broadest at base and narrowing posteriorly, giving the body a broad-shouldered appearance. Many species are found on flowers and are often brightly colored. Members of the genera Anoplodera and Desmocerus, which often occur on flowers, frequently bear yellow, red, or black markings.

Subfamily Cerambycinae (see also PI. 7). The last segment of the maxillary palps is blunt apically. These beetles can be distinguished from Lepturinae by the eyes — usually notched and partly surrounding bases of antennae; they do not have the broad-shouldered appearance of many Lepturinae. A large

0 0

Post a comment