28 
SECOND YARKAND MISSION. 
brown ; the latter are the darkest, and are distinctly less than double the length of the former ; 
they are furnished with hairs, bristles, and spines, and terminate with a small black claw. 
The maxi lice are slightly inclined to the labium, and the latter is slightly hollowed 01 
notched at the apex. 
The abdomen is of a pale straw- yellow colour ; on the fore half is a very faintly visible, 
narrow, elongated mai'king prolonged posteriorly into a line-like point, and of a slightly 
darker hue than the rest of the abdomen ; a little in front of the middle are six reddish- 
brown impressed spots, three in each of two curved lines, whose convexities are opposed to each 
other so as to form a figure like a dice-box; the intermediate spot of each line is much neaiei 
the anterior than the posterior one, and the interval between the two anterior spots is equal to 
that between the two posterior ones. The form of the abdomen is somewhat oblong-o'v ah 
truncated before and rounded behind. The genital aperture consists of two somewhat roundish, 
large, black, contiguous spots in a transverse line, but much obsciu'ed by numerous bristly 
hairs of a sandy-grey hue ; the spinners of the inferior pair are double the length of the 
superior one, and all are of a yellow-brown colour. 
Bab. — Yarkand, May 21st to 27th, 1874. 
Genus — TBACHELAS, L. Koch. 
26.— Trachelas costata, sp. n., PI. II, Eig. 21, ? . 
Adult female : length to 2§ lines. 
The cephalo thorax is short-oval, rather longer than broad, truncated before, moderately', an( 
pretty uniformly, convex above, and constricted on the lateral margins of the caput ; the norma 
indentations are distinct and rather darker coloured than the rest, which is of a yellow-brovn 
colour; the clypeus is less in height than the diameter of one of the fore-central eyes. 4 he 
eyas are of moderate size, and do not differ greatly in that respect ; those of the fore-lateral 
pair are perhaps slightly the largest of the eight ; they are placed as in Clubiona, but the area 
is shorter and broader, the eyes being more closely grouped together. The hinder row is straight, 
the front row much shorter and curved, the convexity of the curve directed forwards. Those 
of the hind-central pair are rather less than double as far from each other as each is from the 
hind-lateral eyes on its side ; the interval between each and the hind-lateral being scarcely 
the diameter of the former ; the interval between those of the fore-central pair is less than 
half a diameter, and each is almost, but not quite, contiguous to the fore-lateral eye on R s 
side. The eyes of each lateral pair are placed obliquely and are separated by about one- 
third of the diameter of the hind-lateral eyes. The interval between each of the hint 
central eyes and the fore* central opposite to it, is equal to the diameter of the latter. 
The tegs are rather short, strong, furnished with hairs and slender bristles only ; t _ eir 
relative length appears to be 4, 1, 2, 3, though the difference in length is not great. 4 
are of a brownish-yellow colour, lighter than the cephalothorax, and faintly annulated m 
dusky brown. Each tarsus ends with two curved pectinated claws, beneath which is a sma > 
not very dense, claw-tuft; and beneath the tarsi and metatarsi are some short, stout ham 
of uniform length, but scarcely amounting to a scopula. _ 
The palpi are short, similar to the legs in colour and armature ; the digital joint is a mu- 
half as long again as the radial, and terminates with a very fine, curved, and almost impel 
ceptible claw. 
