:399 ' ARANEIDEA. 
a. External sclerites of vulva evenly rounded on the outer margins, 
sinuously concave on the inner margins, their anterior end hooked, 
but very narrow, and very sharp at the apex, with a minute cusp on 
the anterior margin. . . . 2 ee ew ee ee ee ee prolatus. 
6. External sclerites of vulva emarginate on the outer margins, evenly - 
convex on the inner margins, their anterior end forming a broad 
hook, not very sharp at the apex, without any minute cusp on the 
anterior margin. . 2. 2. eee ee ee ee ew ee Canaaliculatus. 
Nors.—S. purpureus (E. Simon) is unknown to me, nor are the characters given in the description sufficient 
to enable one to identify it or include it in the Table. 
1. Senoculus prolatus, (Tab. XXXIII. figg. 1, la, 6, 3; 2, 2.) 
Labdacus prolatus, O. P.-Cambr. Biol. Centr.-Amer., Arachn. Aran. i. p. 218, t. 28. figg. 3, 
3a-f(3)*. 
Type 3d, gynetype 9, in coll. Godman & Salvin. Total length, g 10, 9 12 millim. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith!); Guatemata (Sarg). 
2. Senoculus canaliculatus, sp.n. (Tab. XXXIII. fige. 3, ¢; 4, 4a, 2.) 
Type 3, gynetype 2, in coll. Godman & Salvin. Total length, ¢ 8, 9 10 millim. 
Hab. Mexico, Teapa (H. H. Smith); Guatmmata (Sarg); Panama, Bugaba 
(Champion). 
The females from Mexico may prove to belong to a different species, when more 
material is available for examination. 
8. Senoculus purpureus. 
Labdacus purpureus, E. Simon, Bull. Soc. Zool. Fr. v. p. 155 (1880) *. 
Type, 2, in coll. E. Simon. Total length 8°5 millim. 
Hab. Panama}. 
This species is very likely identical with the preceding, but without figures it is 
almost impossible to identify it. 
Fam. HERSILIIDA. 
The spiders belonging to this family probably furnish another instance of the survival 
of a few examples of an ancient group, of which the greater number of the species have 
long since died out, together with the connecting-links, which might have given a clue 
to their relation to other existing groups. They sit squatting close to the bark of trees 
and move with great rapidity, after the manner of the species of the genus Philodromus. 
The tarsal claws are three and the eyes eight in number (see figures). 
