686 REV. O. P. CAMBRIDGE ON NEW [Nov. 18, 



in 1879 from Captain Hutton. In general appearance and colours 

 it reminds one strongly of Spiders of the family Palpimanides, from 

 which, however, it is clearly distinct, and its true position is, as it 

 appears to me, among the Enyoides, near the genus Ceto, Sim., to 

 which it seems to be tolerably nearly allied, though differing in the 

 relative length and breadth of the cephalothorax, as well as in the 

 form of the maxillae and labium, and in other structural points. 



Fam. Agelenides. 

 Robsonia, gen. nov. 



Cephalothorax short, broad, truncated before, not very convex 

 above ; the fore extremity of the caput scarcely narrower than the 

 thorax ; lateral marginal constrictions at the caput very slight. 



Eyes small, subequal, in two transverse subparallel rows, the 

 anterior of which is the shortest and very close to the fore margin 

 of the caput, rendering the clypeus almost obsolete. The posterior 

 row of eyes is slightly curved, the convexity of the curve directed 

 forwards ; the four central eyes are the smallest. 



Legs moderate in length, slender, 1, 4, 2, 3, furnished with very 

 fine prominent hairs, some of which, on the undersides, are very 

 long. On the tarsi and metatarsi of the third and fourth pairs are 

 a very few short spines. Tarsal claws three in number ; the superior 

 pair strong, slightly curved, and furnished with about ten fine denti- 

 culations or pectinations ; the inferior claw very abruptly bent down- 

 wards close to its base. The hairs are strongest and most numerous 

 beneath the fore extremities of the metatarsi and tarsi of the second, 

 third, and fourth pairs, but do not constitute either a scopula or 

 claw-tuft properly so-called. 



Falces very long, strong, straight, prominent, and almost cylin- 

 drical ; the fang, when at rest, directed backwards, slightly obliquely, 

 but approaching nearly to the position characteristic of the Thera- 

 phosides. Each falx is furnished with a row of teeth almost 

 throughout its whole length on the inner side of the fang as it lies 

 at rest, and two others form a short row on the opposite side of the 

 base of the fang. 



Ma.vil/ce long, straight, greatly enlarged at the hinder part where 

 the palpi are inserted, and constricted immediately above that point ; 

 their outline is rounded to the extremity, where they are obliquely 

 truncated in a slightly hollow line inwards. 



Labium long, about two thirds the length of the maxillae, of a 

 broadish oblong-oval form, truncated both at the base and apex. 



Sternum heart-shaped. 



Abdomen oviform : spinners six, rather short, but all of equal 

 length, the two middle ones being of unusual size, almost equal, in 

 fact, to the rest. 



The affinities of this genus are rather puzzling. Were it not for 

 the three terminal tarsal claws, it would seem to come easily into the 

 family Drassides. The form of the maxillae and labium point to a 

 relationship with the Dysderides. It must, however, I think, be 



