340 Mr. J. Blackwall on new Species of Araneidea 



to the spinners, where the two meet ; and in the anterior part 

 of the space comprised between the two bands there is a short 

 longitudinal one, of a dark dull-greenish colour, which is 

 rather irregular in outline, ramified at its posterior extremity, 

 and has a short transverse bar of the same hue near its anterior 

 extremity ; a somewhat obscure yellow band extends along each 

 side of the medial line of the under part, and two nearly parallel, 

 irregular, fine, black lines pass from the sexual organs halfway 

 towards the spinners; the sexual organs are highly developed, 

 with a strong septum in the middle, and are of a very dark 

 greenish colour, tinged with red, that of the spinners being pale 

 green. 



Two adult females were comprised in the collection, one of 

 which had deposited its ova. 



It is proposed to transfer the Spiders of the genus Pasithea 

 from the family Thomisidce, in which they were originally placed, 

 to that of the Lycosida, as, by the disposition of their eyes and 

 the structure of their legs, they evidently possess a relation of 

 affinity to certain species of the genus Sphasus. 



Family TnoMisiDiE. 



Genus Selbnops, Dufour. 



Selenops alacer. 



Length of the female |ths of an inch ; length of the cephalo- 

 thorax -^, breadth -^ ; breadth of the abdomen ^ ; length of 

 a leg of the third pair l-j\ ; length of a leg of the first pair 1 . 



The eyes are disposed on the anterior part of the cephalo- 

 thorax; four, nearly equal in size, form, immediately above the 

 frontal margin, a slightly curved transverse row, whose convexity 

 is directed forwards; the eyes of each lateral pair are seated 

 obliquely on a tubercle apart, the two anterior ones, which are 

 oval and the smallest and lightest- coloured, being situated a 

 little in advance of the lateral eyes of the transverse row ; and 

 this row, if extended, would include in its curve the two posterior 

 eyes, which are the largest of the eight. The cephalothorax is 

 large, depressed, compressed before, slightly rounded in front, 

 and greatly so on the sides, which are strongly marked with 

 furrows converging towards an oblong indentation in the medial 

 line of the posterior region ; it is of a red-brown colour, and is 

 supplied with hoary hairs having a yellowish tint." The falces 

 are short, powerful, conical, very convex in front, vertical, and 

 armed with a few teeth on the inner surface ; the maxillae are 

 straight, and increase in breadth towards the extremity, which 

 is obliquely truncated on the inner side ; and the lip is semi- 

 circular. These parts are of a dark-brown colour, tinged with 



