THERIDION.—ARGYRODES, 207 
Theridion oblivium, sp. n. 
Adult female, length 23 lines. 
Cephalothorax of ordinary form; ocular area rather prominent, especially the middle of the fore part; clypeus 
higher than half the facial space, much impressed below the eyes, prominent at the lower margin. Colour 
yellow-brown, strongly suffused and marked with a deeper hue. 
Eyes in general normal position, occupying the whole fore part of the caput. The central quadrangle is 
considerably longer than broad, and distinctly wider in front than behind; the fore-centrals and hind- 
laterals appear to be the largest, the hind-centrals smallest, the interval between the latter, equal to 
nearly about an eye’s diameter, being a little less than that which separates each from the hind-laterals ; 
the slight curve of the posterior row is directed backwards. 
Legs moderate in length and strength, 1, 4, 2,3. They are yellow in colour, annulated (but not spotted) with 
dark, slightly reddish-yellow-brown, and clothed with numerous coarse hairs. 
Falces not very strong, straight, yellow-brown, striped longitudinally with a deeper hue. 
Masxille and labiwm dark yellow-brown, the latter much broader than high and emarginate at its apex. 
Sternum longer than broad, subtriangular, with prominences opposite the insertion of the legs. It is yellow in 
colour, narrowly bordered with deep red-brown, in which the prominences form a series of blunt subconical 
points, three on each side and one at the hinder extremity. 
Abdomen large, nearly equal in length and height at its highest part. At the beginning of the posterior slope 
is a distinct subconical prominence. It is yellow-brown in colour, somewhat symmetrically spotted and 
marked with white, black, and dark yellow-brown; the hinder slope is almost vertical, much spotted with 
dull yellow and whitish, and with a large irregular black marking on each side nearly halfway to the 
spinners; below these black patches on each side to the spinners is a close-set series of short transverse 
parallel deep brown lines. The underside is blackish, with a large central whitish marking, whose anterior 
side has two large angular indentations; behind this on each side near the spinners are two white spots. 
It is somewhat thickly clothed with coarse red-brown hairs. The genital aperture is small but of 
characteristically distinct form. 
Hab. Costa Rica (Rogers). 
This spider is somewhat similar to Theridion tepidariorum and T. fordum, Keyserling ; 
but the subconical prominence on the abdomen (which allies it with Theridion miatum) 
distinguishes it at once from both the other species named, and the unspotted legs 
separate it from 7’. tepidariorum. 
ARGYRODES, Simon. 
Argyrodes aurea, sp. n. 
Adult female, length slightly over 1 line; length of abdomen on upperside § line; height from spinners to 
upperside rather over § line. 
Cephalothorax of normal form ; fore part of the ocular area broad and prominent; clypeus strongly transversely 
impressed immediately below the ocular area, but roundly prominent at the lower margin. Colour yellow- 
brown, suffused with blackish and with a marginal black line. 
Eyes normal in general position. The convexity of the slight curve of the posterior row directed forwards. 
Central quadrangle broader than long, and perhaps slightly wider in front than behind; fore-lateral eyes 
largest ; the hind-central eyes are nearly double as far apart as each is from the hind-lateral next to it. 
The height of the clypeus rather exceeds half that of the facial space. 
Legs rather short, slender, 1, 2, 4,3; those of the first pair much the longest. Colour of the first pair like 
that of the cephalothorax, with a narrow yellowish annulus at the hinder extremity of the tibiw, the 
metatarsi being also yellow, with a narrow dark brown annulus at the fore extremity ; the second pair are 
yellow, the tibize annulated with dark brown; the third and fourth pairs yellow. 
Falces strong ; similar in colour to the cephalothorax. 
Maxille and labium normal and of a yellowish-brown colour. 
Sternum subtriangular, obtusely pointed at the hinder extremity. 
