caburensmnnesacienend cone atari csin ce 
276 ARANEIDEA. 
directed backwards, and its central pair of eyes rather further from each other than from the hind-laterals. 
Central quadrangle as broad as long, and its anterior side slightly longer than the posterior. Those of 
each lateral pair are separated from each other by the diameter of the hind-lateral eye. Fore-laterals 
smallest of the eight. The height of the clypeus slightly exceeds the diameter of one of the fore-central 
eyes. 
Legs moderately long, not greatly differing in length, 4, 1, 2, 3, slender ; claw-tuft and scopula absent; spines 
almost only beneath the tibie and metatarsi of the first and second pairs, where they are arranged in 
pairs. 
Falces rather long, powerful, subconical, prominent at their base in front. 
Mazille short, strong, broadest near their extremity, where they are truncate, rounded on the inner side, and 
rather inclined towards the labium. 
Labium short, much broader than high, the sides curving to the apex, which is rather flat or truncate. 
Sternum oval, hollow-truncate at its fore end, and slightly drawn out at its hinder end, which is truncate and 
only divided by a suture from the fore extremity of the coriaceous pedicle connecting the cephalothorax 
and abdomen. This pedicle is cylindric and of moderate length, and runs into a strong, chitinous, 
transversely and deeply rugulose sheath, which increases in size to the plates of the spiracles and genital 
aperture, with which it coalesces; just behind the posterior end of this sheath, on the upperside of the 
abdomen, are two strongish, curved, prominent spines, each issuing from a strongish tubercle in a 
transverse line just at the beginning of the abdomen, which last is short, round-oval, rather broader behind 
than in front; and on the fore half of the upperside is a large, convex, shining, smooth, coriaceous plate, 
rounded at its posterior extremity. 
Mazax spinosa, sp. n. 
Adult female, rather more than 2 lines in length. 
Cephalothorax deep yellowish-brown, thinly covered with short, grey-white, squamose hairs. 
Legs dull orange-yellow, those of the first two pairs rather palest; femora much clouded and marked with 
black or black-brown ; the tibie of the fourth pair have a broad black-brown annulus towards their fore 
extremity, the greater part of the metatarsi of the same pair being also black-brown ; the genue of the 
third and fourth pairs are also much clouded with the same colour. The spines under the tibie of the 
first and second pairs are in three pairs, under the metatarsi in two pairs. 
Palpi rather long, blackish-brown, and furnished with hairs and a few spines. 
Falces dark yellow-brown. 
Mawille and labiwm black-brown, whitish at their extremities. 
Sternum deep yellow-brown. . 
Connecting pedicle and sheath rich deep brown. 
Abdomen black, thinly covered with hairs, of which some are white and squamose ; the coriaceous plate on the 
fore part of the upperside is deep brown, and has also a few white squamose hairs on it. The genital 
aperture is inconspicuous but of characteristic form ; when quite uninjured the white squamose hairs would 
probably form transverse lines, of which there are still traces on the sides of the abdomen. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
This spider is of considerable interest. Being very doubtful as to its position, I 
submitted it to M. Simon, who refers the species to the genus Micaria, of which the 
type is M. fulgens, Walck.; but as it appears to me to differ from this in every 
essential generic character, and to find no place elsewhere, I have formed a new genus 
for it. DM. spinosa is undoubtedly closely allied to, but distinct from, Myrmecotypus, 
Cambr. (antea, p. 123, t. 18. figg. 6, 6 a-d), which M. Simon includes as synonymous 
with Apochinomma, Pavesi—whether rightly or wrongly I cannot say, as I have not seen 
an example of this latter; but M. Simon’s description of that genus appears to differ 
in several important respects from MJyrmecotypus. 
