30 Mr. J. Blackwall on new species of 



VII. — Notice of Spiders captured by Professor Potter in Canada, 

 with descriptions of such Species as appear to be new to science. 

 By John Blackwall, F.L.S. 



On the return of my friend Professor Potter from Canada to 

 England in the autumn of 1844, he obhgingly transmitted to me 

 specimens of spiders preserved in spirit, which he had captured 

 in that and part of the preceding year in the vicinity of Toronto. 

 The collection comprised twenty-six species, including numerous 

 varieties occasioned by differences in age, sex, and other circum- 

 stances of a less obvious character ; seventeen of them I have de- 

 scribed in detail, under the impression that they are new to 

 arachnologists ; one is known to occur in the United States of 

 North America ; and the remaining eight species, which are com- 

 mon to the American and European continents, I have introduced 

 as contributing in some measure towards the elucidation of a 

 subject possessing a considerable degree of interest ; namely, the 

 geographical distribution of Araneidea. 



Tribe OCTONOCULINA. 



Family Ltcosid^. 



Genus Lycosa, Latr. 



1. Lycosa Babingtoni. 



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

 thorax f ; breadth -J^ ; breadth of the abdomen y^^ ; length of 

 a posterior leg 1^ ; length of a leg of the third pair ^, 



Mandibles powerful, conical, vertical, very hairy in front, and 

 provided with strong teeth and long hairs on the inner surface : 

 maxillae gradually enlarged from the base to the extremity, which 

 is obliquely truncated and fringed with long hairs on the inner 

 surface ; they are somewhat curved towards the lip, which is al- 

 most quadrate : sternum heart-shaped, hairy : these parts are dark 

 brown, the extremities of the maxillae and lip being tinged with 

 red. Cephalo-thorax hairy, compressed before, depressed on the 

 sides and at the posterior part, with furrows diverging from the 

 middle towards the lateral margins, and a narrow indentation in 

 the medial line of the posterior region ; it is of a brown colour, 

 which is darkest at the anterior part, where the eyes are seated, 

 and it has a narrow, longitudinal, yellowish brown band on each 

 side and in the middle, the latter being the most conspicuous. 

 Intermediate eyes of the anterior row larger than the exterior 

 ones ; anterior eyes of the quadrilateral the largest of the eight. 

 Legs long, robust, provided with hairs and sessile spines ; fourth 



