732 MR. F. 0, 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. crassipes, 
Keys.; the form of the cephalie 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. tarsalis, Perty, A. rufipes (Lucas), and A. natterert, Auss. 
(Dol. in MS.), females, I will not venture to speak; nor can lL 
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, C. K., and A. piceus, Auss. 
One would not be inclined to attach too great value to the 
characters of A. valencianus, Sim., seeing that the specimen is 
evidently quite young (“ pullus,” sec. Simon). 
Genus AcantHopon, Guérin. 
Type. Acunthodon petitii, Guérin (2), 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. 
Curapace 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. yes. 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. Jovea deep, procurved. Mandables 
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 than broad, slightly narrower towards apex, furnished with 
a single central transverse pair of cusps. Cowa 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 i. cuspidate 
on either side. The spinners are almost obsolete through age, and 
several of the legs are missing. 
