. Bulletin - United States National Museum. Science. 1)2 BULLETIN 34, UNITED STATES NATIONAL MUSEUM wards, nearly coutiuuoas medially. Tbe paraspbeuoid teeth stand on two narrow plates, which are well separated, especially behind, and are shortened; anteriorly they only reach to near the middle of the orbits. The mandibular teeth present pecularities in the male, by which it may be readily distinguished from the female. In a large number of speci- mens the oral commissure is but little undulate, and the mandibular teeth though longer medially, are continued to near the basis of the coronoid pr
. Bulletin - United States National Museum. Science. 1)2 BULLETIN 34, UNITED STATES NATIONAL MUSEUM wards, nearly coutiuuoas medially. Tbe paraspbeuoid teeth stand on two narrow plates, which are well separated, especially behind, and are shortened; anteriorly they only reach to near the middle of the orbits. The mandibular teeth present pecularities in the male, by which it may be readily distinguished from the female. In a large number of speci- mens the oral commissure is but little undulate, and the mandibular teeth though longer medially, are continued to near the basis of the coronoid process. The males exhibit a strongly flexuous commissure, and the alveolar margin of the mandible is deeply concave below tbe front of the orbit, and is edentulous. The distal portion is abruptly convex and is armed with long teeth. Tbe margin is sligbtl^^ concave anterior to this point, and finally rises again at the symphysis, which is prominent and protected externally by a pad of crypts as in D. fuscus. The structure of the males is in the mandibular dentition quite that of the genus Autodax; the A. ferreus presenting the characters but little more strongly. ¥o such sexual difference can bo found in the , though the commissure only may be sometimes more flexu- ous in males. The jaws and dentition in the D. nigra do not differ in tbe two sexes. I have observed that two of the many males of Z>. ochro- phfca possess the female denition. The tongue in D, ochrophcea is an elongate oval, considerably free behind. Tbe color of females is a bright brownish yellow, fading to dirty white below, with a dark brown shade on each side from the eye to tbe end of tbe tail, which is daikest above and gives the dorsal space tbe char- acter of a band. There is an irregular series of brown dots along the vertebral line. Males are rather larger and usually darker in color; tiins the dorsal band Is brownish, tbe lateral band blackish, and tbe dorsal spots more distinct. In most specim
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