ON A COLLECTION OF FORMICID^ FROM LOWER 

 CALIFORNIA AND SONORA, MEXICO. 



BY THEO. PERGANDE. 



The determination and description of Formicidee can 

 only be accomplished in a satisfactory way if large series 

 of specimens, taken from the colonies, are available for 

 examination and comparison. It was with some reluc- 

 tance, therefore, that I have undertaken the task of de- 

 termining the small collection of ants which was brought 

 together by Mr. Gustav Eisen and Mr. Chas. D. Haines 

 of San Francisco, Cal. If I have ventured to describe 

 some of the species as new, it has been done after a 

 thorough study of the literature on the subject and after 

 a careful comparison with the material at my command. 



FORMICID^. 



1. Camponotus maculatus Fab., race ocREATUsEm. 

 One ^ major, one § minor. San Luis and San Es- 



teban. 



This race is found as far north as the Panamint Mount- 

 ains, Cal. 



The description of this new race by Prof. C. Emery 

 will shortly be published in the Zoologische Jahrbiicher. 



2. Camponotus fragilis n. sp. 



5 major: Length, 7-9 mm. Honey-yellow; posterior 

 angles of the head, the femora and scale somewhat paler; 

 the face between the eyes, the clypeus, disk of pro- 

 thorax and the abdomen above, except a broad anterior 

 margin of the second and third segments, brownish. 

 Scape blackish beyond the middle. Eyes black. Man- 

 dibles reddish. Pubescence yellowish, long and slender, 

 densest on the head, thorax and abdomen, sparse along 

 external edge of anterior femora, with a few hairs only 

 at the basal third or fourth of the external edge of the 



2d Seb., Vol. IV. September 19, 1893. 



