76 



SECOND YARKAND MISSION. 



Genus TIBELLUS, Sim. 

 Thanatus, C. L. Koch, ad partem. 



94. TlBELLTJS PROPINQUUS, sp. n. 



Immature female : length rather more than 2J- lines. 



This spider is very nearly allied to Tibellus oblongus (Walck.), which it resembles closely 

 in form and colour. In the present species, however, the tibiae and metatarsi of the legs, 

 together with the upper sides of the femora of the first and second pairs, are speckled with 

 minute, dark red-brown spots, while, among a large number of examples of the European 

 species (T. oblongus), I can find no trace of this speckling. It is possible that the discovery 

 of the adult males may show that this spotting of the legs, as well as a less definite abdo- 

 minal marking, is merely a local variation not amounting to a specific distinction. 



Hab. Kashghar, December 1873. 



Genns THANATUS, C. L. Koch. 



95. THANATUS THOEELLII. 



Thanatus thorellii, Cambr., Spid. Pal. and Syria, Proc. Zool. Soc., 1872, p. 309. 



Hub. Immature examples were found in the collections made at Yarkand in November 

 1873, and on the road thence to Bursi, between May 28th and June 17th, 1874. 



96. THANATUS ALBESCENS, sp. n. 



Adult female : length 2| lines. 



The cephalothorax is of a very flattened form ; it is as broad as, or broader than, long, 

 truncated behind, and somewhat obtusely pointed at its anterior extremity in the ocular region; 

 the lateral marginal constrictions of the caput are exceedingly slight ; it is of a pale dull yellow- 

 brown hue, and has a narrow lateral white margin with a little white venose suffusion above 

 it ; the occipital region is also paler than the surrounding surface. 



The f aloes are small, straight, nearly perpendicular, like the cephalothorax in colour, at 

 their bases, and paler at their extremities. 



The legs, palpi, maxillae, and labium are of a pale dull straw-colour. The legs are rather 

 long and slender. Those of the second pair are distinctly the longest, and the third 

 rather the shortest. 



The eyes are very small, scarcely differing in size, and seated on round white tubercles 

 in two curved rows, of which the anterior is much the shorter and more strongly curved. 

 The interval between those of each lateral pair is distinctly greater than that between the 

 fore- and hind-central pairs ; those of the hind-central pair are a little further from each other 

 than each is from the hind-lateral on its side, while the interval between the four centrals is 

 more than double that between each and the fore-lateral next to it, and just equal to that 

 between each and the hind-central opposite to it. The fore-centrals appear to be very slightly 

 larger than the fore-laterals, and the interval between the fore-central and its nearest fore- 

 lateral eye is but a little more than the diameter of the former. 



