NOTES ON LIFE-HISTORIES OF AUSTRALIAN ARANEID.E — RAINBOW. 135 NOTES ON THE ARCHITECTURE, NESTING-HABITS, and LIFE-HISTORIES op AUSTRALIAN AR ANEID^, based ON SPECIMENS IN THE AUSTRALIAN MUSEUM. By W. J. Rainbow, F.L.S., Entomologist. Part IL— THE CRIBELLATiE. Simon, in his work, "Histoire Naturelle des Araignees" (second edition), divides Spiders into two sub-orders, namely, Aranese theraphosse and Aranse verse. Of these, the former was dealt with in my last paper. The latter, which now claims our atten-tion, is again divided into two sections — Cribellatse and Ecribellatse, these terms signifying that those of the first section have what is known technically as a cribellum and calarnistrum, whilst those constituting the second section are not so provided. All the Spiders of the sub-order under consideration may be distinguished from the Territelarife by their falces, which, instead of being strongly porrected, as in the Aranete theraphosae, are directed vertically or obliquely from their base; moreover, their fangs strike sideways, the falces moving in a horizontal or oblique direction, whilst those of the Trap-door Spiders are directed down-wards, and move vertically parallel to one another. The Aranefe ver« cribellatse are divided into eight families, namely : Hypochilidse, Ulo-boridte, Psechridse, Zoropidfe, Dictynid3e,fficobiidfe, Eresidje, and Filistatidae; and of these the second, fifth, and eighth are represented in Australia. The cribellum is an addi-tional silk-spinning organ, and is situated between and at the base of the first pair of spinners ; it consists of a slightly elevated, transverse plate, divided above into two throughout their entire length. joint each, the apices of which are truncated, compressed, and concave. The surfaces of these joints are minutely and numerously punctured, and emit a quantity of fine, flocculent silk, which is used in the construction of webs. %mmp' Fig. 15.— The Cribellum. parts, but united at the base These parts consist of a single
Notes on the architecture, nesting-habits, and life-histories of Australian Araneidae, based on specimens in the Australian Museum. Part II. The Cribellatae
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