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.