206 ARANEIDEA. 
which is a much larger spider and one which I have received both from the Amazons 
and Parana, S. America. 
Theridion mixtum, sp. n. 
Adult female, length from rather less than 2 to nearly 23 lines. 
This spider is allied to 7. fordum, Keys., and others of that group. 
Cephalothorax of ordinary form, yellow-brown, the ocular region, the hinder part of the caput, the thoracic 
indentation, some converging lateral lines, and other scratchy markings on the sides black-brown. The 
marking on the hinder part of the caput with that at the thoracic junction gives an exact representation 
of a tumbler standing ona stem. This marking is, however, also observable, though not so strikingly, 
in 7. fordum. 
Eyes normal; the central quadrangle is slightly longer than broad, a very little broader in front than behind ; 
the fore-central eyes largest, the hind-centrals smallest, or about equal to the fore-laterals ; clypeus 
strongly impressed immediately below the eyes, and very prominent at its lower side, exceeding in extent 
half that of the facial space. 
Legs short, 1, 2, 4, 3, tolerably strong, yellow-brown or brownish-yellow, pretty closely marked with small 
deep reddish-brown spots, and with an annulus of the same colour at the anterior extremity of the 
femora, tibie, and metatarsi; femora at times more or less suffused with brown, the tarsi immaculate, 
yellowish, the metatarsi paler than the tibiee and femora. 
Falces neither very long nor strong, straight; colour yellow, tinged with reddish, and marked with a longi- 
tudinal dark reddish-brown straight stripe on the outer side, and a shorter somewhat curved one on the 
inner side in front. 
Maxille and labium normal, yellow-brown, paler at the extremities. 
Sternum subtriangular, margins strongly indented, corresponding with the fitting in of the coxal joints of the 
legs, and with a strong marginal prominence opposite to each of these joints. Colour reddish-yellow, 
with an indented black-brown marginal border. 
Abdomen large, upper convexity very great; a subconical prominence at the highest point marks the posterior 
extremity of the upperside and the beginning of the hinder slope, the height of which is greater than the 
length of the abdomen: looked at in profile the abdomen (including that part which projects over the 
thorax) forms an almost equilateral triangle. The ground-colour of the abdomen is brightish red-brown, 
speckled more or less all over with minute yellowish points, and marked on the sides with two slightly 
oblique curved fine yellowish or whitish-yellow lines, more or less strongly margined, on one or both sides, 
with black; sometimes a third yellow line may be traced in front of the other two lines by a linear 
disposition of the small yellow spots. A still more distinct yellowish line than either of the rest runs 
perpendicularly from the summit of the subconical prominence (which is black) to close above the spinners, 
being crossed by several somewhat obscure pale yellowish and black angular lines or chevrons. The 
abdomen is paler along the median line of the upperside, and the upper ends of the anterior lateral yellow 
lines are united by a W-formed yellow transverse line; the surface in front of these lines is more or less 
suffused with black, but with the pale specklings still apparent. On the underside there is a pale reddish- 
yellow transverse linear marking just behind the genital process, and a larger one, of an obtuse-angled 
triangular form, a little in front of the spinners. The spiracular plates also are rather conspicuously 
yellow. The abdomen is rather thickly covered with short, coarse, rusty-yellowish hairs. The genital 
process is small but of characteristic form. Spinners short, compact, clear reddish-yellow-brown. No 
doubt age makes a difference in the darker or lighter general hue; one example was of a generally foxy- 
red colour, but it has all the characteristic markings quite distinct. 
Hab. Guatemaua, Chiacam (Sarg). 
Though this spider is closely allied to Theridion fordum, Keys., the shorter legs and 
more densely pilose abdomen, and the subconical prominence at the upper extremity 
of the latter, will serve to distinguish it readily, besides its different general aspect and 
smaller size. 
