ULOBORWUS. 265 
however, excepting the narrow central longitudinal stripe (which is generally narrower in this sex) and 
a narrow pale margin, is uniformly deep brown; the black marking bordered with white on the hinder 
part of the abdomen is equally, or more, conspicuous, and the anal prominence (in both sexes) is unusually 
developed, pointed and articulated, its articulations evidently the continuation of some false articulations 
at the extremity on the upperside of the abdomen whence it springs; in well-marked specimens the 
sides of the abdomen in the female are yellow-brownish, marked with several slightly oblique black and 
white broken lines. The calamistrum on the tibiae of the fourth pair of legs extends almost throughout 
the whole length of the joint. The genital aperture and process are well developed, prominent, and of 
characteristic form. 
Hab. Mexico, Teapa in Tabasco (7. H. Smith). 
Uloborus cinereus, sp. n. 
Adult female, length 1} lines. 
General form, structure, and appearance normal. 
Cephalothorax pale yellow, clothed with coarse white hairs; sides of caput and thorax blackish; a white 
diffused spot just in front of the thoracic indentation, and another smaller one just behind each hind- 
lateral eye. 
Eyes in normal position and subequal, but the distance between the two transverse rows is rather greater than 
in the species before described. The central quadrangle is distinctly longer than broad, and its anterior 
side shorter than the posterior; the hind-central eyes are very distinctly further apart than from the 
hind-laterals. 
Legs moderately long, 1, 4, 2, 3, not very strong, the length of the first pair not greatly exceeding that of the 
fourth pair. Spines apparently absent. Colour pale yellow, the tibie of the first pair, excepting a patch 
at the base on the upperside, black; genuz blackish or dark brown, and a portion underneath the 
anterior extremity of the femora of the first pair black. Calamistrum on the basal half of the metatarsi 
of the fourth pair, and some coarse tufted hairs at the fore extremity of the tibie of the first pair. 
The fore extremity of the tibie of the fourth pair is suffused with blackish, and there are a few coarse 
tufted hairs on the upperside. 
Falces, maxilla, and labium pale yellow-brownish. 
Sternum dark yellow-brown, its posterior extremity a little produced in an obtuse form. 
Abdomen produced, but not much elevated, on the upperside in front; at its highest part are two low, blunt, 
subconical or roundish prominences in a transverse line. Colour white, the sides marked or suffused with 
blackish ; underside blackish, a space around the base of the spinners black, Spinners dull brownish- 
yellow, the superior pair tinged with black. Abdomen probably more or less clothed with white hairs 
(mostly rubbed off in the only example seen). Genital aperture of distinctive form. Lip just in front 
of the supernumerary mamillary organ well marked and fringed with longish hairs. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
Uloborus spernax, sp. n. 
Adult female, length 14 lines. 
General form and structure normal. 
Cephalothoraa yellow-brown, more or less suffused with dark brown, and thinly clothed with grey hairs; a 
white spot at the thoracic junction, and two on the lateral margin on each side, which is broad and dull 
yellow. 
Eyes subequal, their general position normal ; those of the fore-central pair no larger than the hind-laterals. 
Central quadrangle as long as broad, and its fore side distinctly shorter than the hinder one. The 
interval between the hind-centrals is distinctly greater than that between them and the hind-laterals. 
Legs moderately long, 1, 4, 2, 3, those of the first pair not so long in proportion as in some other species of 
the genus. Spines absent ; a group of somewhat spiniform hairs at the fore extremity of the tibia, Colour 
pale yellow. The calamistrum extends only along the posterior half of the metatarsi of the fourth pair. 
Falces, maxilla, labiwm, and sternum slightly darker than the legs. 
BIOL. CENTR.-AMER., Arachn. Aran., August 1898. 2 ut 
