. A manual for the study of insects. Insects. COLEOPTERA, 543 at the roots of trees and grass; a few live under the bark of trees. The family Georyssid^ (Ge-o-rys^si-dse) includes only two American species. " They arc small, rounded, convex, roughly sculptured, black insects, found at the margin of streams, on wet sand ; they cover themselves with a mass of mud, so that no part of the insect is visible.'* (LeConte and Horn.) The family PARNlDiE (Par'ni-dae) includes small water beetles, in which the legs are not fitted for swimming. The tarsi are five-jointed ; the first four segments of
. A manual for the study of insects. Insects. COLEOPTERA, 543 at the roots of trees and grass; a few live under the bark of trees. The family Georyssid^ (Ge-o-rys^si-dse) includes only two American species. " They arc small, rounded, convex, roughly sculptured, black insects, found at the margin of streams, on wet sand ; they cover themselves with a mass of mud, so that no part of the insect is visible.'* (LeConte and Horn.) The family PARNlDiE (Par'ni-dae) includes small water beetles, in which the legs are not fitted for swimming. The tarsi are five-jointed ; the first four segments of the tarsi are short and equal; the fifth is longer than the others con- joined ; the tarsal claws are unusually large. The body is clothed with fine, silken hairs, which retain a film of air when the insect is beneath the water. These beetles are found adhering to stones or plants beneath the surface of the water. The larva of Psephenus lecontei (Pse-phe^nus le-con'te-i) is common in the East, clinging to the lower surface of stones in rapid streams; and we have found it in muck near a spring. It is very flat and circular in outline (Fig. 652), and measures about five sixteenths of an inch in length. It is rarely recognized as an insect by the young collector. Other larvae of this family have similar habits, and resemble this species in form except that the margin of the body is notched between the segments. ^ Fig. 652. The family Heterocerid^ (Het-e-ro- cer^i-dse) includes only the genus Heterocerus (Het-e-roc'e- rus). These beetles '* are oblong or subelongate, oval, densely clothed with short silky pubescence, very finely punctate, and of a brown color, with the elytra usually vari- egated with undulated bands or spots of a yellow color. They live in galleries which they excavate in sand or mud at the margin of bodies of water, and, when disturbed, run from their galleries and take flight.*' (LeConte and Horn.). Please note that these images are extracted from scanned page i
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
