Mr. J. Blackwall on new species 0/ Araneidea. 9l 



southern latitude and greater proximity to the continent must 

 exercise some influence; 3rdly and lastly, with respect to the 

 species of the adjacent African continent, of which only a few of 

 the larger species, or of others introduced by commerce, but 

 none of the far more numerous smaller kinds, are known. It is 

 much to be desired that future investigations may be carried on 

 in these directions. 

 Teneriife, July 28, 1858. 



XII. — Descriptions of six recently discovered species, and Charac- 

 ters of a new genus 0/ Araneidea. By John Blackwall, 

 F.L.S. 



Tribe Octonoculina. 



Family Lycosid^. 



Genus Dolomedes, Latr. 



Dolomedes ornatus. 



Length of the female y^th of an inch; length of the cephalo- 

 thorax ^V ^ breadth ^-^ ; breadth of the abdomen -^-q ; length of 

 a posterior leg y ; length of a leg of the third pair § . 



The cephalothorax is convex, glossy, compressed before, 

 rounded on the sides, and has a slight indentation in the medial 

 line ; a broad brownish-red band, which tapers to its posterior ex- 

 tremity, extends along the middle, and on each side of it there is a 

 longitudinal brown band, which decreases in breadth to the lateral 

 eye of the posterior row ; the sides have a pale, dull, yellow hue, 

 that of the lateral margins is black, and a blackish spot occurs 

 on the frontal margin, below each lateral eye of the anterior row. 

 The falces are conical, vertical, and armed with a few teeth on 

 the inner surface : the maxillse are short, somewhat enlarged 

 and rounded at the extremity, and slightly inclined towards the 

 lip. These organs have a pale, dull, yellowish hue ; a blackish 

 streak extends along the former, and appears like a continuation 

 of the spot on the frontal margin of the cephalo-thorax. The 

 lip is nearly quadrate, and of a yellowish-brown colour, the sides 

 being much the darkest. The sternum is heart-shaped, and of 

 a pale, dull, yellow hue, with broad, brownish-black lateral 

 margins. The eyes are seated on black spots on the sides and 

 in front of the anterior part of the cephalothorax; the four 

 anterior ones are minute, and form a straight transverse row, 

 the exterior ones, each of which is placed on a minute tubercle, 

 being rather the smallest ; the other four are large, and describe 

 a trapezoid whose posterior side is much the longest ; the pos- 

 terior eyes of the trapezoid are seated on tubercles, and the 

 anterior ones are the largest of the eight. The legs are mode- 



