732 Mil. 1\ O. PIOEABD OAMBEIDGl ON [June 16, 



A. luteipes, Keys., of which I hare examined the type (a young 

 female), appears to me to be undoubtedly the young of A. crassipes, 

 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. lateipes, Keys. ; whereas in 

 A. harlii and A. ivallacei the cephalic area is much narrowed 

 behind and deeply impi-essed on either side. 



Of A. tarsalis, Perty, A. rujlpes (Lucas), and A. nnttereri, 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- 

 palpis, 0. K., and A. piceus, Auss. 



One would not be inclined to attach too great value to the 

 characters of A. vahncianus, Sim., seeing that the specimen is 

 evidently quite young {'■'■ pullus" sec. Simon). 



Genus Acanthodon, Guerin. 



Type. Acanthoilon petitii, Guerin ( ? ), Rev. 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 exist- 

 ence. 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 (lougitudiually 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. Et/es. Anterior centrals 

 half a diameter apart ; posterior centrals three diameters apart, 

 nearly two diameters from posteiuor 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, uear 

 the outer margin, which is friuged with coarse rufous hairs. 



Sternum too damaged to furnish any useful character. Labium 

 longer than broad, slightly narrower towards apex, furnished with 

 a single central transverse pair of cusps. Goxa 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 tlie legs are missing. 



