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Show 732 MR. F. O. PICKARD CAMBRIDGE ON [June 16, A. luteipes, Keys., of which I have examined the type (a young female), appears to me to be undoubtedly the young of A. crasslpes, Keys. ; the form of the cephalic area, broad behind and only slightly impressed at the sides, is very characteristic of the latter, and agrees in this respect with A. luteipes, Keys.; whereas in A. hartii and A. wallacei the cephalic area is much narrowed behind and deeply impressed on either side. Of A. tarsalls, Perty, A. rufipes (Lucas), aud A. nattereri, Auss. (Dol. in MS.), females, I will not venture to speak; nor can I deduce any satisfactory characters from those given by Ausserer. Of the males, of which I have examined only A. liodon, Auss., I am at present unwilling to speak ; the other males are A. longi-palpls, C. K., and A. plceus, Auss. One would not be inclined to attach too great value to the characters of A. valenclanus, Sim., seeing that the specimen is evidently quite young ("pullus" sec. Simon). Genus ACANTHODON, Guerin. Type. Acanthodon petltll, Guerin ($ ), Bev. Zool. Soc. Cuv. 1838, p. 10. In coll. Brit. Mus. Nat. Hist. (Plate XXXIV. figs. 9, 10, 11, 12.) This specimen, now upwards of sixty years old, is still in existence. A short description of its remains may be useful. Carapace 10-75 long., 9 lat. ; cephalic area two-thirds the length of carapace, gibbous, and slightly bilobate, depressed towards the clypeus. Width (longitudinally with respect to carapace) of ocular tumulus equal to distance from posterior margin of posterior row of eyes to the posterior margin of anterior row of eyes. Its length one and a half times its width. Eges. Anterior centrals half a diameter apart; posterior centrals three diameters apart, nearly two diameters from posterior laterals; one and a half or even more from anterior centrals. Anterior laterals set on a low, bilobate tubercle, half a diameter apart, distant from the anterior centrals a space equal to width of the ocular tumulus, from anterior margin to posterior margin. Fovea deep, procurved. Mandibles with the rastellum consisting of numerous stout teeth. Fang-groove armed with a row of 8 stout conical teeth on the inner margin; 5 smaller ones on the floor, opposite nos. 5-8 of inner row, near the outer margin, which is fringed with coarse rufous hairs. Sternum too damaged to furnish any useful character. Labium longer thau broad, slightly narrower towards apex, furnished with a single central transverse pair of cusps. Coxa of pedipalp twice as long as broad, furnished with numerous cusps on the anterior apical and basal angles, besides others studded on the anterior surface. Tarsi three-clawed; superior pair armed with a single denticle towards the base. Tarsi and protarsi i. and ii. cuspidate on either side. The spinners are almost obsolete through age, and several of the legs are missing. |
