FORMICID^ OF LOWER CALIFORNIA, MEXICO. 



BY THEO. PERGANDE. 



Since the publication of my paper, published in these 

 Proceedings (pp. 26-36, ante), I have again received, 

 through Mr. W. J. Fox of Philadelphia, another small 

 collection of ants from Lower California, collected by 

 Dr. Gustav Eisen, among which are some species not 

 previously recorded from the peninsula of Lower Cal- 

 ifornia, and also several new forms, which will herewith 

 be described. I hardly need to say that our knowledge 

 of the Formicidce of Lower California is still very limited, 

 and that the material now available for study represents 

 but a small fraction of the genera and species actually 

 occurring: in that interestingr reg'ion. 



FORMICID^. 



I. Camponotus sayi Emery, subsp. bicolor, n. 

 subsp. 



t^ major: Length, 9-10 mm. Head, 2.8x2.6; scape, 

 2 mm.; post, fem., 2.6 mm. 



Almost identical with the typical form, though larger 

 and more robust. The head is somewhat longer and its 

 posterior margin more deeply concave ; the surface more 

 highly polished; eyes smaller; anterior emargination 

 of the clypeus broader and more distinct. Mandibles 

 smoother, rather more highly polished, not striated or 

 but very feebly so, and with fewer punctures. The su- 

 tures between thoracic segments are deeper, especially 

 that between the meso- and metanotum ; the mesonotum 

 more elevated. 



Colorotion as in sayi, though the head somewhat dark- 

 er red. 



^ minor: Length, 3-7 mm. The head of this form 

 is much narrower than in the ^ major, particularly pos- 



2d Ser., Vol. IV. ( U ) May 17, 1894. 



