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 maxilla are slightly inclined to the labium, and the latter is slightly hollowed or 

 notched at the apex. 



The abdomen is of a pale straw- yellow colour; on the fore half is a very faintly visible, 

 narrow, elongated marking 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 nearer 

 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-oval, 

 truncated before and rounded behind. The genital aperture consists of two somewhat roundish, 

 large, black, contiguous spots in a transverse line, but much obscured 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 TRACHELA8, L. Zoch. 



26. TRACHELAS COSTATA, sp. n., PI. II, Fig. 21, 3 . 



Adult female : length 2J to 2f lines. 



The cephalothorax is short-oval, rather longer than broad, truncated before, moderately, and 

 pretty uniformly, convex above, and constricted on the lateral margins of the caput ; the normal 

 indentations are distinct and rather darker coloured than the rest, which is of a yellow-brown 

 colour ; the clypeus is less in height than the diameter of one of the fore-central eyes. The 

 eyes 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 its 

 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 hind- 

 central eyes and the fore- central opposite to it, is equal to the diameter of the latter. 



The legs are rather short, strong, furnished with hairs and slender bristles only ; their 

 relative length appears to be 4, 1, 2, 3, though the difference in length is not great. They 

 are of a brownish-yellow colour, lighter than the cephalothorax, and faintly annulated with 

 dusky brown. Each tarsus ends with two curved pectinated claws, beneath which is a small, 

 not very dense, claw-tuft ; and beneath the tarsi and metatarsi are some short, stout hairs 

 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 about 

 half as long again as the radial, and terminates with a very fine, curved, and almost imper- 

 ceptible claw. 



