204 PROCEEDINGS OF THE ACADEMY OF 



Breadth between temporal crests 5 in. 3 1. 



" " frontal borders 6" 9 1. 



" of nasal meatus 1" 101. 



" of muzzle at notch 3 " 7 1. 



middle 2 " 



Teeth || 



Delphinus d e 1 p h i s. 



In four specimens (two from Mus. Salem,) the teeth vary within the above 

 tabulated range, and have the length of muzzle from notch three times the 

 breadth at latter point. The intermaxillaries form an elevated ridge. One 

 specimen probably from the British seas. 



Steno frontatus Gray ex Cuvier. 



A fine specimen from Mus. Salem (No. 102,) differs from the figure in Osse- 



mens Fossiles in that the contraction of the muzzle takes place behind the 



middle of its length, instead of in front of it, and the prominence of the nasal 



bones marks nearly the middle of the orbit instead of falling a short distance 



behind the postorbital process. Dimensions as follows : 



In. Lines., 



From end of symphysis mandibuli to convexity of occip. condyle... 21 



Length of symphysis 5 3 



" of ramus 16 6 



End of muzzle to palatal notch 13 10 



" " to preorbital notch 12 



Width at " " 4 3 



" of palate at first tooth 3 3 



" " ninth tooth - 1 8 



" between temporal crests 5 8 



" of nasal meatus 2 3 



" at postorbital processes 8 5 



Teeth incurved, fang compressed |J 



Habitat. Unknown. 



Platanista gangetioa. 



Mus. Academy. Morton Coll. 



On the Species of GALEKUCA and allied Genera inhabiting North America. 

 BY JOHN L. LE CONTE, M. D. 



Some of the species mentioned in the present paper are of interest in an 

 economical view, being quite injurious to cultivated plants. Others will pro- 

 bably be found more or less injurious, as the advance of civilization in the 

 western territories will from time to time enable them to substitute for their 

 indigenous food plants useful to man. 



Confusion exists in regard to the nomenclature of our species, not only 

 because some of the most abundant have remained undescribed, but also for 

 the reason that those already known have not been properly referred to the 

 genera recognised in other parts of the globe ; nor have definitions of the genera 

 yet been given in any American work. 



With a view of supplying the information thus needed, and enabling those 

 interested in economic entomology to work with more effect by having the 

 objects distinctly defined by characters and names, I have here endeavored to 

 give in a brief synoptic form the distinctive marks of the Galerucse and allied 

 genera contained in my collection. 



The tribe Galerucini (Galerucidse of authors) consists of those Chryso- 

 melidje having the antennae inserted upon the front, generally closely approxi- 

 mate, long and slender ; the anterior coxce prominent and conical, generally 



[Oct. 



