1874.] REV. O. P. CAMBRIDGE ON NEW DRASSIDES. 393 



are oval, slightly oblique, about equal in size to those of the hind 

 central pair, and each is contiguous to the fore central eye on its 

 side ; the interval between the eyes of each lateral pair is equal to 

 half the diameter of one of them. All the eyes are pearly white, 

 except those of the fore central pair, which are dark. The height of 

 the clypeus is rather less than the diameter of one of the fore central 

 eyes and is equal to about one fourth of that of the facial space ; 

 the interval between each fore central eye and the hind central 

 opposite to it is equal to the diameter of the former. 



The legs are strong, especially in the femoral joints, and moderately 

 long ; their relative length appeared to be 4, 1, 2, 3 ; but the difference 

 is not great ; they are of a yellow-brown colour, not quite so dark as 

 the cephalothorax ; they are furnished, but not thickly, with hairs 

 and spines, and beneath the two terminal claws on each tarsus is a 

 small tuft of squamose or papilliform hairs. 



The palpi are moderately strong, but not very long ; the cubital 

 joint is short ; the radial is about equal in length, but is gradually 

 produced on its outer side into a long tapering process, somewhat 

 bluntly but angularly enlarged beneath towards its extremity, which 

 terminates with a sharply curved spinous point ; the angular enlarge- 

 ment gives it the appearance, in some positions, of being somewhat 

 bifid at its extremity. The digital joint is large, and of a pointed 

 oval form ; its length equals that of the cubital and radial joints 

 together (including the apophysis of the latter). 



The falces are moderate in length, nearly vertical, and rather 

 slender ; these with the maxillae, labium, and sternum, which are all 

 of normal structure, are of a yellow-brown colour, rather paler than 

 that of the cephalothorax. 



The abdomen is of moderate size, and of an oblong-oval rather 

 flattened form ; on the fore half of the upperside is a large, yellow- 

 brown, somewhat oval, shining, coriaceous patch, occupying nearly its 

 whole width ; this patch is pointed behind, and through its semitrans- 

 parent substance may be seen the usual elongate, longitudinal, central, 

 fusiform, dark black-brown stripe or bar ; the hinder part of the 

 upperside of the abdomen is of a pale dusky yellow-white colour, 

 with a large black-brown patch, from the sides of which issue the 

 ends of the normal oblique stripes or chevrons, the angles of which 

 are lost in the black -brown patch ; the sides are black-brown, and 

 the underside dusky yellowish white. The spinners are rather long, 

 brownish black, of nearly equal length, those of the inferior pair 

 being the strongest and rather the longest. 



An adult male of this very distinct Drassus was found by myself 

 under a stone near Alexandria, Egypt, in April 1864. 



Drassus alexandrinus, sp.n. (Plate LI. fig. 18.) 



Adult male, length 4 lines. 



This species is very nearly allied to D. cegyptius (postea, p. 394) ; 

 it is, however, rather larger, and differs in the form of the palpal 

 organs, while it resembles it closely in general form, structure, and 

 colours ; it differs also from D. lapidicolens (Walck.) in the same 



Proc. Zool. Soc— 1874, No. XXVI. 26 



