ON SOME RARE ARACHNIDS 5 1 



and reported on my new species. My thanks therefore are 

 due to the Rev. O. Pickard-Cambridge, M. E. Simon, Prof. W. 

 Kulczynski, and Prof. H, J. Hansen. 



Ischnothyreus velox sp. nov. (Family Oonopidae.) 

 Plate IV., figs. 9, lo, ii, 12, and 13. 



Length nearly 2 mm. Facies somewhat resembling that 

 of Oonops pulcher (Tempi.) The male is rather slenderer 

 than the female, but is not much shorter. 



Cephalothorax is of a rather dark yellowish-brown, much 

 darker than the abdomen or legs. The depth of colour, how- 

 ever, varies in different individuals. 



In i\\e. female the profile begins to rise immediately behind 

 the eyes and ascends in an inclined plane to the thoracic 

 juncture. It then descends rapidly in a somewhat hollow 

 form to the pedicle. 



In the male the profile rises suddenly behind the eyes in a 

 strongly gibbous form, the highest point of which is at least as 

 high as the thoracic juncture. Between the eyes and the latter 

 point the outline forms a distinct arc. At the thoracic juncture 

 it descends as in the female sex. In both sexes striae radiating 

 from the thoracic juncture mark the position of the sutured 

 cephalothoracic segments. On each side of the anterior part 

 of the cephalothorax, about the level of the occiput, a some- 

 what pyriform space is mapped out by a faint line. The 

 pointed end of this space terminates on each side at the 

 margin of the cephalothorax, near the coxa of the first pair of 

 legs. The whole surface of the cephalothorax is somewhat 

 granular. 



The EVES are six in number. All are large and placed 

 upon black spots. The four posteriors are arranged very nearly 

 in a straight line. The two anteriors, obliquely placed, are 

 contiguous on the one hand with the posterior laterals, and on 

 the other each touches its fellow. The enclosed space is 

 deeply pigmented, and the whole ocular area is strongly 

 hirsute. 



