424 REV. O. P, CAMBRIDGE ON NEW ARANEIDEA. [May 16, 
and second pairs is a not very dense scopula ; and the terminal claws 
are two, apparently not denticulated ; and beneath them is a short, 
dense, compact claw-tuft. 
Falces long, powerful, and vertical, with a very strong fang. 
Mazxille strong, curved over the labium, convex on their exterior 
surface, rounded on their outer sides, obliquely truncated at their 
extremities on the inner side, and with a strong indentation on their 
inner side, just above the level of the apex of the labium. 
Labium short and somewhat oval ; sides curved, and apex slightly 
hollowed. 
Sternum short, oval, truncate before, pointed behind. 
Abdomen oblong-oval, somewhat subcylindrical ; spinners short, 
compact, those of the inferior pair strongest. 
XEROPIGO TRIDENTIGER, Cambr. (Plate XXIX. fig. 1.) 
Olios tridentiger, Cambr. P. Z. 8. 1869, p. 538, pl. xlii. fig. 6; 
and E. Simon, Actes de la Soc. Linnéenne de Bordeaux, vol. xxxiv. 
((4] vol. iv.) p. 299. 
Length of the adult male 43 to 6 lines. 
The cephalothoraz is of a dark reddish-brown colour, deepening 
to black on the caput and falces, and pretty densely clothed with 
short greyish pubescence. 
The eyes of the posterior row are nearly equally separated, the in- 
terval between those of the hind central pair being perhaps rather 
the largest. The four central eyes form very nearly a square, and 
the intervals between those of the anterior row are small, but equal ; 
the fore centrals are much the largest of the eight. 
The legs are yellow, clothed with greyish-yellow pubescence and 
other hairs, and the spines are tolerably long and strong. 
The palpi are rather short, and of a redder yellow-brown than 
the legs, deepening to dark red-brown on the radial and digital 
joints. The radial is rather longer than the cubital joint, and is a 
little produced at its extremity in front, with several somewhat den- 
tiform spines and projections issuing from the extremity of its outer 
and under sides; three of these are close together on the outer 
side, two being sharp-pointed and the lower one enlarged and 
obtuse at its extremity ; underneath the joint is the fourth, which 
is pale-coloured, and furnished with a strong, red-brown, curved 
(somewhat sinuous) tapering spine, whose point is close to the base, 
on the outer side of the digital joint. The digital joint is large and 
of a long-oval form, slightly prominent near the middle on the outer 
margin, The palpal organs are not very prominent or complex, 
but have several spines and spiny processes near their fore 
extremity. 
The falces have their surface roughened with numerous minute 
tubercular granulations, and are covered with strong bristly hairs. 
The mazille and labium are of a deep blackish red-brown colour ; 
and the sternum is of a lighter hue. 
The abdomen is pretty densely clothed with short hairs of a 
