171 



are actually ivpreseutod in our collections. Of these 58 species, not 

 more than ten are found in the old catalogue, the remaining 48 thus 

 representing the i)rogre3s made in the knowledge of the fauna since 

 its publication. 



The Lcptidae in the present list contain 47 species (30 Atlantic, 

 6 Pacific and 11 tropical), against 32 species of the old list (all from 

 the Atlantic States, but at least five of which drop off as synonyms). 



The Mydaidae contain 28 species (16 Atlantic, 3 Pacific and 9 

 tropical), against 15 (8 Atlantic and 7 tropical) of the old catalogue. 



The stars prefixed to the specific names in the following list, indi- 

 cate the species contained in Mr. Loow's collection, or in the Museum 

 of Comparative Zoology. 



As an appendix, I give the description of three new species of 

 Mydas, one of which Avas recently discovered in the State of New 

 York. 



Family LEPTIDAE. 



TRIPTOTRICHA. 



Loew, Cent. X, 15; id. Bed. Eat. Z., 1874, p. 381, note. 



*fasciventris Locic, Bed. Ent. Z., 1874, p. 380. Pennsylvania. 

 *riillthorax Say, J. Ac. Phil. Ill, p. 3G, 5 (Leptis); Wiedemann, Aiiss. Zw. 

 I, p. 233 {id.). Pennsylvania ; New York ; Kentucky. 



*discolor Loew, Bed. Ent. Z. 1874, p. 379. San Francisco. 



*lauta Loew, Centur. X, 15; comp. also Berl. Ent. Z.,1874, p. 382. California. 



PHENEUS. 



Walker, Dipt. Saunders. 



tibialis Walker, Dipt. Saund. p. 156. Tab. IV, fig. 3. Jamaica. 



N. B. — Mr. Walker refers this genus to the Asilidae. I place it here on the 

 autliority of Mr. Loew {in Hit.). 



CHRYSOPILA. 



Macquart, Dipt, du Nord de la France, 1827. 



♦basilaris Say, Journ. Ac. Phil. Ill, p. 36, 4 {Leptis); Wiedemann, Auss. Zw. 

 I, p. 228, 16. (id.) VValker, List, etc., I, p. 217. Pennsylvania. 



