1898.] INSECTS AND ARACHNIDS FROM SOCOTRA, 389 



(in some examples, however, of the latter the legs are of a more 

 uniform dull yellow-brown). 



Siibfam. Tetragnathin.e, 

 Gen. Tetragnatha Walck. 

 Tetragnatha boydi, sp. n. (Plate XXXI. fig. 4.) 



Adult female (No. 101), length 4 lines ; length of cephalothorax 

 2 lines ; length of falces 2| lines nearly. 



Cephalothorax oblong-oval, truncated at each extremity, and 

 widest near the middle ; length double its breadth ; lateral marginal 

 impressions at caput very slight ; caput and margins of thorax 

 darker than the rest ; yellow-brown, but in the dry specimen the 

 colour is unreliable. 



Eyea of posterior row equally separated ; in a very slightly 

 curved line, the convexity of the curve directed forwards ; anterior 

 row much more strongly curved, but with the same direction of 

 the curve ; central quadrangle slightly broader than long, and the 

 fore side distinctly shorter than the hinder one ; the f ore-central 

 pair of eyes longest, and seated on a strongish rounded tubercular 

 prominence ; each of the lateral eyes also on a tubercle. The eyes 

 of each lateral pair are much nearer to each other than the fore- 

 central pair are to the hind-centrals. Clypeus rather less in height 

 than half the facial space. 



Falces very long and projecting forwards, slightly longer than 

 the cephalothorax; considerably divergent ; slightly curved, rather 

 constricted at the fore extremity. Fang more than three-fourths 

 the length of the falx, strong, abruptly bent at the base where it 

 is somewhat enlarged, and there is another somewhat shallow 

 dentiform enlargement towards the middle on the inner sid.^ ; and 

 each of the falces is armed with a strong, somewhat curved, pointed 

 tooth at its extremity, just below the outer side close to the insertion 

 of the fang ; also on the inner side nearly beneath the base of the 

 fang is another strong sharp-pointed tooth ; besides these teeth each 

 falx has a double longitudinal row of others along the underside ; 

 those on the outside are most numerous (10 ?) and most equally 

 separated, the inner ones (7 or 8?) strongest and more confined 

 to the posterior portion of the falx, those of both rows diminishing 

 in strength as they run backwards. 



Legs very slender ; 1, 2, 4, 3, very little difference between 2 

 and 4 ; furnished with hairs and a few short slender spines. 



MaA'ilke, labium, and sternum normal. 



The abdomen was so shrivelled and devoid of colour that nothin<' 

 can be said as to its colours or markings, which, however, are 

 most probably distinctive of the species. 



This Spider is nearly allied to Tetragnatha taylori Cambr. 

 (South Africa), but the relative position of the eyes is different, as 

 well as the form of the fang and the denticulation of the falces. 



[19] 



