216 ARANEIDEA. 
greater part of its length, furnished on the convex or inner side with long pale bristly hairs; from its 
base on the outer side issues a bent or curved apophysis nearly as long and strong as the joint and with 
the same direction; this apophysis is convex outside, concave inside, and strongly emarginate or bifid 
at its extremity, which is a little broader than the base. The digital joint is large, as long as the radial 
and cubital joints together, oval, much drawn out at its fore extremity, like that of the genus Tegenaria. 
The palpal organs are prominent and highly developed, situated mostly beneath the basal half of the 
digital joint, and consisting of strong corneous processes, one of which extends to the extremity. 
Falces of the same colour as the cephalothorax, long, moderately strong, straight, slightly porrected, a little 
cut away towards their anterior extremity on the inner side; teeth on the inner margins, if any, very 
minute; a number of coarse bristly bent hairs at their fore extremity on the inner side, spreading over 
the fangs. 
Mazxille, labium, and sternum yellow. 
Abdomen elongate-oval, of a uniform pale luteous-yellow colour. Spinners moderate in length, porrected, the 
inferior pair strongest, the superior rather longer. 
Hab. Guatemaa, Santa Ana (Sarg). 
ARISTON *, gen. nov. (fam. Uloboride). 
This genus is nearly allied to Uloborus, Latr., but differs from it in the much wider ocular area, as well as in 
other respects. 
Cephalothorax short, broad, truncated behind, very obtuse in front ; lateral marginal impressions at the caput 
slight ; profile level from the eyes to the hinder slope. 
Eyes subequal, of moderate size, the fore-centrals, perhaps, the largest, in two transverse nearly parallel curved 
rows ; the convexity of the curves directed forwards; the posterior row rather the shortest and most 
curved. The width of the ocular area is nearly or quite double its length; the central quadrangle is 
broader than long, and its anterior side distinctly shorter than the posterior. The interval between the 
hind-centrals is nearly four times that between each and the hind-lateral eye next to it; this last interval 
is about an eye’s diameter; that between the fore-centrals is about two diameters. The anterior row 
occupies the whole width of the caput. The height of the clypeusis nearly or quite equal to the diameter 
of the fore-central eyes. 
Legs short, 1, 4, 2, 3, slender, destitute of spines ; throughout the length of the upperside of the femora of the 
2nd, 8rd, and 4th pairs is a single line of rather close-set, long, prominent, curved, slender hairs, each 
issuing from a minute tubercular base or granulation. This, however, may be only a specific character. 
Palpi short, ending with a weak, untoothed, curved claw. 
Falces short, strong, straight, subconical, prominent or tumid in front. 
Maxille short, strong, broad, truncate. 
Labium small, somewhat wider across the middle than at the base, and pointed at the apex. 
Sternum rather elongate-oval, hollowed out strongly at the anterior margin to admit the labium, very convex. 
Abdomen short-oval, strongly convex above; spinners short at the apex of the abdomen, inferior pair strongest ; 
infra-mammillary organ undivided, and close in front of it is a long transverse opening (probably spira- 
cular). The calamistrum on the metatarsi of the fourth pair of legs extends only along half the joint. 
Ariston albicans, sp. n. 
Adult female, length 1 line. 
Cephalothorax pale yellow, with a broad, diffused, dusky blackish, longitudinal band on each side from the 
hind-lateral eyes to the posterior extremity. 
Eyes on black, slightly tuberculate spots (for relative size and position, &c., see generic characters above). 
Legs dull greenish-yellow, suffused on the tibie, metatarsi, and tarsi with a dusky hue; on the genus, and 
also at the base, and near the fore extremity on the upperside of each of the tibiee is a long, tapering, 
somewhat spine-like bristle. 
* Nom. propr. 
