278 ARANEILDEA. 
are moderate, a little stronger than in C. dubtwm; the oblique indentations denoting the lateral junctions 
of the caput and thorax are represented by merely a very slight, but perceptible impression ; in neither 
sex was there any trace of the normal median indentation at the junction of the caput and thorax. 
The cephalothorax is of a dark brown colour, covered with short grey hairs and long prominent pale ones 
of a bristly nature. 
Eyes very nearly as in C. dubium, but the posterior row has a very slight curve whose convexity is directed 
forwards, and the central quadrangle is more nearly square, its anterior side, however, appears to be 
slightly longer than the posterior. 
Legs pale yellow, marked nearly the same (though perhaps more distinctly striped in appearance), with dark 
brown or blackish, as in C. dubiwm. The spines, however, are longer, and there are three pairs in the 
series beneath the tibize of the first pair of legs. The relative proportion of the legs appears to be the 
same as in C. dubium, 4, 3, 1, 2. 
Palpi( g ) moderately long, dark brown; digital joint paler ; cubital and radial joints short, the latter strongest, 
and with several spine-like bristles on the upperside, but no apophysis on the outer side at the extremity. 
The digital joint is very long, narrow-oval, almost cylindrical, greatly exceeding in length that of the 
radial and cubital joints together. The palpal organs are well developed but simple, consisting of a 
roundish corneous lobe drawn out at its fore extremity nearly to the end of the joint, and terminating 
with a black, sharp-pointed, somewhat corkscrew-shaped spine just beneath the tip of the joint. 
The falces are similar to those of C. dubiwm and of a deep brown colour. 
The maaille are rather longer than in C. dubiwm and not quite so rounded on their inner extremities. Colour 
dark blackish-brown, with pale whitish on the inner margin and extremities. 
Labiwm broader than long, though the actual base is about equai to the width of the apex, the sides being 
strongly rounded ; apex truncate, with the corners rounded off. Colour blackish-brown, with pale 
whitish apex. 
Sternum elongate-oval, truncate in front, and its sides towards the posterior extremity opposite the coxz of the 
third pair of legs very strongly emarginate. It is blackish-brown in colour, clothed with a few long 
coarse hairs. 
Abdomen short, somewhat oval, narrow in front, broad behind. It is blackish in colour, clothed with pale hairs, 
and more thinly with long prominent bristles ; on the fore extremity of the upperside are two long, curved, 
tapering spines in a transverse line directed backwards, and two more in front of them closer together 
but less long and strong. The short: pedicle connecting the thorax and abdomen has a kind of protecting 
sheath in the slight production of the hinder extremity of the thorax, and the abdomen has a rugulose 
coriaceous sheath at its fore extremity. Spinners as in C. dubiwm, but apparently set in a circular pit or 
sheath ; the transverse prominence and lip close in front of the spinners is of a more pronounced character 
than in that species, and between this and the inferior spinners is a well-marked colulus of a triangular 
form. 
The female resembles the male in form, colours, and general appearance. The genital aperture is very simple 
in form but characteristic. 
The grey and white hairs clothing various portions of this spider, as well as of C. dubium, are, when seen 
through a microscope, plumose. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
Mr. Smith has the following note on this species:—‘‘ Female in a leaf, in thick 
woods near a stream; it was sitting on the point of the leaf with the front legs 
extended. A black ant resembling this spider is common in the same woods. 
According to my observations, these ant-like spiders eat only the species of ant which 
they resemble. A specimen of this spider was found in a shady glen, in a thickish 
silken nidus on a leaf.” 
