266 ARANEIDEA. 
Abdomen elevated above, with two slight protuberances in a transverse line at-the highest part. Colour dull 
brown. On the upper part, and upper part of the sides, it is clothed with golden-brown hairs; the two 
protuberances are each furnished with a tuft of somewhat spine-like hairs, of which there are two smaller 
tufts on each side in a longitudinal line converging towards and above the spinners. Lower part of the 
sides and underside white ; inferior spinners pale yellow-brown, superior spinners darker yellow-brown. 
The lip in front of the infra-mamillary organ is well developed and rather pointed. Genital aperture 
characteristically different from those of the other species above described, though bearing a certain 
resemblance. 
Hab. Mexico, Teapa in Tabasco (H. H Smith). 
Uloborus variegatus, sp. n. 
Adult female, length 14 to 2 lines. 
General structure normal. Cephalothorax deep brown or black, clothed with coarse grey pubescence. 
Eyes from above and a little in front, in two transverse concentric rows ; the hind-centrals are slightly further 
from each other than from the hind-laterals; the fore-centrals considerably largest, and nearer together 
than to the fore-laterals; the central quadrangle a little longer than broad. 
Legs annulated with pale yellowish-white and black, or (in the brown-tinted examples) with yellowish and 
dark brown. A single pale annulus, about one-third of the length of the femora, from the anterior end. 
Relative length 1, 4, 2, 3, those of the first pair not inordinately longest. Calamistrum on the metatarsi 
of the fourth pair running along the larger portion of the joint. Armature as in the other species, and 
all the legs are furnished with coarse grey hairs. 
Falces brown or yellowish-brown. 
Mavzille and labium brown, paler at the extremities. 
Sternum dark brown or black, clothed with coarse grey pubescence. 
Abdomen greatly and very obtusely raised at the fore part, with four rounded prominences at its summit, 
forming a large square; the two anterior prominences are smaller than the posterior ones and round, the 
posterior round but subconical. The colour of the abdomen is a mixture of black, brown, grey, and white, 
or black-brown, yellow-brown, grey, and white, and it is pretty thickly clothed with coarse grey and 
golden pubescence; at the fore margin of the upperside are two large, almost confluent, white patches in 
a transverse line, and a little way above the spinners are two short white lines forming a circumflex- 
accent mark whose point is directed forwards. The underside is greatly protuberant in the middle, and 
the lip-like projection just in front of the supernumerary spinners (or infra-mamillary organ) is strongly 
developed. The genital aperture is large and much resembles that of Uloborus vicinus described below, 
but still differs characteristically. 
In immature examples the posterior pair of prominences on the abdomen are stronger than in the adults. 
Hab. Mexico, Omilteme in Guerrero (H. H. Smith). 
From Mr. Smith’s notes it would seem that these spiders are gregarious, or inhabit 
the webs of a larger spider, but this point is not quite clear. The species is one in 
which there is a great variety in colours and markings; one example (which I believe 
to be only a variety) has the abdomen of a uniform dull brownish hue, regularly and 
thickly covered with small white spots of varied shape. 
Vloborus vicinus, sp. n. 
Adult female, length 13 lines. 
Closely allied to Uloborus signatus both in form, colours, and markings, but much smaller; the characteristic 
black marking on the posterior slope of the abdomen, edged with white in that species, is in this spider 
obsolete or only indicated by two or four small white spots on the general dark colour of the slope; the 
pale whitish-yellow annulus near the fore extremity of the tibie of the first pair of legs is in the present 
species clear and distinct, but very narrow. The cephalothorax is uniformly black, with a narrow pale 
