. American spiders and their spinningwork. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . palps; mb, v i j. i? rpi mandible; dg, digital joint of a slight furrOW. illC palps; ra, radial joint; hu, holloW of the failg ishumeral; cu, cubital; ax, ax- • i i i iUary; mx, maxilla;; lb, labi- OCCUpied by a meml)ra- um;sm, sternum; ex, coxa of j-^^^g ^^^^ wllich Icadsthe leg; gl, breathing gills; ep, epyginum ; sp, spinnerets rep- UpWard tO a g la lid resented clcsed; ac, anal elos- ^^^^^^^l witlliu tllC This gland is suj
. American spiders and their spinningwork. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . palps; mb, v i j. i? rpi mandible; dg, digital joint of a slight furrOW. illC palps; ra, radial joint; hu, holloW of the failg ishumeral; cu, cubital; ax, ax- • i i i iUary; mx, maxilla;; lb, labi- OCCUpied by a meml)ra- um;sm, sternum; ex, coxa of j-^^^g ^^^^ wllich Icadsthe leg; gl, breathing gills; ep, epyginum ; sp, spinnerets rep- UpWard tO a g la lid resented clcsed; ac, anal elos- ^^^^^^^l witlliu tllC This gland is sujiposetlto secrete a poisonous liquid. The falx is covered with hair, especially near the base, and at the apex is formed into a toothed groove or sheath into which the fang is folded down when at rest. The sternum (sm) is a cordate plate whichforms the under part of the shell of thecephalothorax. It has four inden-Sternum. ^.^^j^^g ^^ g^ch side, which markthe insertion of legs. On the for-ward part at the middle is placed the labiumor lower lip (lb), a subtriangular or semi-ovateorgan of the mouth. (See Fig. 10.) to the labium and above it is. Fig. 11. Dorsal view of Epeira , abdomen ; b, base ; ap, apex of ab-domen; pt, pits which mark the attach-ment of abdominal muscles; cp, ceph-alic part of cephalothorax; t p, thoracicpart; mb, mandibles. 1, 2, 3, and 4,the legs represented in their order,first, second, third, and fourth. Teh,trochanter of the leg; ex, ccxa; fm,femur; dg, digital, ra, radial, cu, cu-bital, hu, humeral joint of ])alps. the u]ipcrli]), a slight liair tipped iirojectiou, which is the termination of the i)alate. On eitlier side of thelabium is placed one of the maxilla; or lower jaws. They vary in form, the variation giving good generic characters. They have a Maxillse. GENERAL CLASSIFICATION AND STRUCTURE. 23 rotary motion upon the fore part of the sternum, moving toward andagainst each other, thus crushing the interposed prey. The palp
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Keywords: ., bookcentury1800, bookdecade1880, bookidamericanspid, bookyear1889
