ARGYRODES.—ARIAMNES. 129 
(excepting at their posterior extremities), the tibiee with a small pale annulus at their hinder extremity. 
The third and fourth pairs are much paler, excepting the genue and the fore ends of the tibiz. 
The falces are dark yellow-brown, tolerably long and strong, straight, a little prominent at their base in front, 
porrected, and their extremities meeting those of the maxille, which with the labium and sternum are of 
normal form and similar in colour to the falces. 
The palpi are short, pale yellow-brown; the digital joint large, oval, deep brown ; the palpal organs very 
simple, consisting apparently of a single large, oval, convex lobe. 
The abdomen is of moderate size, very convex above, broadest and highest at its hinder part, which has a 
small subconical prominence on each side, and its centre drawn out backwards into a short obtuse caudal 
prominence; viewed sideways the profile of the abdomen forms a pretty regular curve with a hollow 
line from the extremity to the spinners, about equal in length to the distance from them to the fore end 
of the abdomen, The colour is black, the upperside ornamented with a bold pattern of silvery lines and 
patches easier to depict than describe, but having a large somewhat quadrate black area at the fore ex- 
tremity ; on each side of the extremity of the caudal prominence is a distinct silvery spot, and also two 
others in a transverse line halfway between the caudal prominence and the spinners, and a straight silvery 
nearly vertical or slightly oblique stripe from the lateral subconical prominence on each side. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
ARIAMNES, Thorell. 
Ariamnes furcata, sp. n. 
Adult female, length very slightly over 1 line ; length of abdomen to the spinners 3 of a line ; height of abdo- 
men 1? of a line. 
Cephalothorax pale and yellowish, with a central-longitudinal, marginal, and converging-lateral dusky brownish 
lines. The height of the clypeus, which is convex and prominent, exceeds half that of the facial space, 
and is suffused with dusky brown. 
Eyes rather small, and most of them nearly equal in size, forming a transverse oval, or in two curved lines, of 
which the anterior is shortest but most strongly curved, the convexity of the curves being directed away 
from each other; the four central eyes form a largish square, and each lateral pair is placed obliquely 
and rather near to it; the anterior eye of each lateral pair is much smaller than the others. 
Legs moderately long, 1, 2, 4, 3, slender, furnished with short fine hairs only; colour pale dull yellowish. 
Falces rather short, straight, not very strong, rather porrected. 
Mawille normal, their extremities level with the extremities of the falces, and almost meeting over the 
labium. 
Labium short, rather broad, somewhat rounded at the apex. 
Sternum rather elongate-subtriangular, and, like the falces, maxille, and labium, similar to the legs in colour. 
Abdomen of a pale luteous colour, thickly covered with silvery-white spots, except on the dorsal vessel, the latter 
showing as an elongate marking pointed at its hinder extremity, which goes off into a fine line, and has a 
short oblique line emanating from it on each side where it begins to taper. The upperside of the abdo- 
men is greatly elevated into an erect tapering eminence two and a half times as high as the length of the 
abdomen, the upper part of which curves a little backwards, and its blunt extremity is divided into two 
small conical divergent processes, directed laterally from each other, and presenting a kind of fish-tail or 
furcate termination. Genital aperture small but of characteristic form. 
Hab. Mzxico, Teapa in Tabasco (H. H. Smith). 
Ariamnes gracillima, sp. n. 
Adult female, length nearly 10 lines; length of cephalothorax 1 line; length to spinners slightly over 2 lines. 
Cephalothorax narrow-oval, flattened ; the whole spider, as preserved in spirit of wine, is of a dull yellow hue, 
but from a rough sketch in colours made by Mr. Champion at the time of its capture, the cephalothorax 
BIOL. CENTR.-AMER., Arachn. Aran., January 1894. st 
