178 ARANEIDEA. 
The female resembles the male in colours and markings. The maxille are more squarely truncated at the 
extremity, and have some flattish disc-like tubercles on the outer sides ringed with black, and a prominent 
spine-like bristle springing from each. The basal half of the labium is dark brown; at the inner side of 
the extremity of the falces are numerous, very long, strong coarse hairs covering the fangs and meeting 
those directed towards them from the inner extremities of the maxille. The sternum is yellow, thinly 
spotted with reddish-brown. Abdomen broad-oval; convexity moderate; genital aperture conspicuous 
and of very characteristic form. The falces have also each towards their extremities on the inner side a 
band of disc-like tubercles like those on the maxille, and surmounted similarly with bristles. 
Hab. Mexico, Omilteme in Guerrero 7000 to 9000 feet (H. H. Smith). 
ATAULFO*, gen. nov. (Theridiide). 
Cephalothorax nearly round, perhaps slightly longer than broad, the anterior extremity in the middle of the 
lower margin of the clypeus a little produced in a short blunt beak-like form, moderately but 
uniformly convex, the profile, from the ocular area, forming a moderate and uniform curve; normal 
indentations, excepting the thoracic, which is longitudinal and slight, obsolete ; ocular area well defined, 
prominent and tuberculiform ; height of clypeus exceeding half that of the facial space. 
Mazille short, strong, greatly inclined towards (almost meeting over) the labium, so much so that the 
truncation on the outer side of the extremity of the two forms a very nearly straight transverse line. 
Labium very small, broader than high, semicircular at the apex; and from its base being inserted into the 
sternum in a curved line, it is of a somewhat transverse-oval form. 
Sternum heart-shaped, longer than broad, truncate at its anterior extremity, and broadly and obtusely produced 
between the coxe of the fourth pair of legs. 
Legs moderate in length and strength, subequal, 4, 1, 2, 3, furnished with hairs only ; tarsal claws with 2-3 
minute teeth. 
Falces small, weak, straight, perpendicular. 
Eyes close together, rather large and round, in a compact group on the ocular prominence ; the posterior TOW 
with a very slight curve, whose convexity is directed forwards; the anterior row curved in a similar 
direction, but much more strongly ; quadrangle of the central four distinctly longer than broad. 
Ataulfo nugax, sp. n. 
Adult male, length 1 line. 
Cephalothorax, falces, legs, palpi, maxilla, labium, and sternum yellow-brown. Ocular area black, the legs 
tinged with orange, and the maxilla, labium, and sternum with brownish. 
Eyes of the posterior row near together, the intervals being very small and equal. ‘The interval between the 
fore-centrals is about half a diameter, and of each from the fore-lateral eye on its side about half that 
extent. The fore-centrals are smallest, the rest subequal ; the fore-laterals are the largest; the laterals 
are separated by a narrow but distinct interval. 
Palpi short, similar to the legs in colour. Radial joint very short, spreading, without any external apophysis 
at its extremity, but with a distinct prominence at its base on the outer side; the margins of this joint 
have a row of strong bristly hairs. The cubital joint is strongly bent and furnished with a few bristly 
hairs on its fore side. The digital joint is very large, oval, obtuse, though narrowest at its fore extremity 
and furnished with bristly hairs ; its length is at least equal to that of the humeral and cubital joints 
together ; its colour is yellow-brown. ‘The palpal organs, directed outwards, consist of several strong 
corneous processes; one of these towards their base is produced into a long, tapering, black spine, which 
curves all round the base and inner margin of the digital joint, and has its fine point in conjunction with 
some other processes at the fore extremity of these organs. 
The falces are only equal in length to the height of the clypeus, and scarcely reach to the fore extremity of 
the maxillx. 
The abdomen is oval, tolerably convex above, of a dull brownish hue, thickly marked with black, which is in 
* Nom. propr. 
