56 ARANEIDEA. 
very minute, seated contiguously on a not very strong prominence, and parallel with and not far from 
the margin of the caput at its anterior corners. 
Falces similar in colour and clothing to the cephalothorax, convex, but not very prominent in front. 
Legs short; 1, 2, and 4 subequal, and 3 not very short, if anything 4 longer than 1, of a yellow-brown hue, 
portions (mostly of 1 and 2) of the femora strongly suffused with deep yellow-brown, clotbed with hairs 
like the cephalothorax. Spines chiefly in two, parallel, rows beneath the tibize and metatarsi. 
Palpi similar to the legs in colour and armature. 
Maaille and labium like the cephalothorax in colour, tipped with a pale whitish or grey hue. 
Sternum dark yellow-brown. 
Abdomen of a greyish-drab colour, thickly clothed with yellow-grey pubescence, thinly mixed with short dark 
bristly hairs; the sides have the appearance of numerous slashings or tapering, vertical, greyish-yellow 
stripes ; the anterior upper part of the abdomen has an obtuse gibbosity on each side, with the space between 
and a little in front of them strongly suffused with deep yellow-brown. Spinners short, tolerably compact, 
dark yellow-brown. Genital process deep bistre-brown, prominent, strong, somewhat tapering, and 
directed backwards, obtusely pointed, with a protuberance on each side near the middle. 
Hab. Costa Rica (Rogers). 
A single example. This spider appears to have some slight affinity with Poltys, 
Koch, towards which it may perhaps be taken to indicate a passage from Epeira. 
KATRA, gen. nov. 
Allied to Cyrtarachne. 
Cephalothorax longer than broad. Thorax broadest behind, narrowing gradually to the lateral constrictions at 
caput, which are tolerably strong. Thoracic indentation strong and transverse; behind the ocular area a 
depression or constriction runs over to the lateral constrictions on the margin. 
Eyes small, in three widely separated groups, on more or less strong tuberculiform prominences. The central 
group of four eyes forms a small quadrangular figure, and each lateral group is seated at the extreme upper 
edge of the caput, the eyes of each being distinctly, but not widely, separated from each other. 
Legs, 1, 2, 4, 3, rather short, those of the first two pairs much the strongest; the inner sides of the tibia and 
metatarsi (which are of a rather bent form) armed with numerous slightly curved spines, of which many 
on the first and second pairs are closely and regularly set, as though designed for some purpose analogous 
to that of the calamistrum in some genera of spiders. Tarsi very short. 
Mazille short, bent, somewhat rounded at their extremities. 
Labium short, subtriangular. 
Sternum elongate, heart-shaped, or triangular. 
Abdomen large, semicoriaceous, immensely developed above, and furnished with prominences and tubercular 
projections. 
Kaira altiventer, sp. n. 
Adult female, length from the clypeus to just above the spinners 5 lines, height of abdomen from spinners to 
extremity of gibbosity nearly 7 lines, length of cephalothorax slightly over 2 lines, breadth of thorax 
1? line. 
The colour of the fore part is dull brownish-yellow, and the cephalothorax is clothed thinly with fine whitish 
hairs. 
The eyes are very small, those of the central group equal to each other. The hind centrals are separated from 
each other by about two diameters’ distance, but each is slightly nearer than this to the fore central eye 
on its side. The anterior side of the central quadrangle is longer than the posterior. The height of the 
clypeus is slightly less than half that of the facial space. 
Falces moderate in length and strength, straight, vertical, rounded but not very prominent in front. 
Abdomen very large and high, and projecting greatly over the thorax; on each side of the upper extremity is a 
strong eminence (the termination pointing inwards) covered with many small blunt subconical prominences. 
