CATALOGUE OF NORTH AMERICAN DIl'TKKA. 7 I 



these; where there seemed to be no valid reason for the alteration) I have 

 followed Say in nomenclature. In most cases of rcde^eripiinn. I omit the 

 locality, as it is the same as in Say's description. 



Achias, Dipterorum Genus a Fabricio conditum. Kilia?, 1830; 16 pp., i plate. 

 Sphyracephala (Achias) brevicornis SAY, redesc. and figured. 



Monographia Generis Midarum. Nova Acta Academiae Natura 1 Curiosorum, 

 xv, 19-56, 3 col. plates; 1831. 



Four new species from North America. 



Williston, Samuel Wendell. 



An Anomalous Bombylid. Canadian Entomologist, Nov., 1879, 215. 



"Anthrax nov. sp., near fuliginosa." 



Some Interesting New Diptera. Transactions of the Connecticut Academy of 

 Arts and Sciences, iv, 243-246, 1880. 



Rliyiiclioccphaliis suckcnii, Sili'ius polliiwsits, Chrysops discalis, new. 



Eristalis tenax. Note on distribution, Canadian Entomologist, xm, 76; Aug., 

 1881. 



New or Little Known Genera of North American Syrphidas. Canadian Ento- 

 mologist, xiv, 77-82, 1882. 



Three new genera, five species ; superseded by his Synopsis of the 

 Syrphidse. 



Drosophila ampelophila Loew. Canadian Entomologist, xiv, 138, 1882. 

 Note on habits and distribution. 



Contribution to a Monograph of North American Syrphida?. Proceedings of 

 the American Philosophical Society, xx, 299-332, 1882. 

 23 new species, all reproduced in the Synopsis. 



On the North American Asilida? (Dasypogonina?, Laphrin;e) with a New 

 Genus of Syrphidse. Transactions of the American Entom. Society, xi, 



1-36, 3 pi. ; 1883. 



20 new species of Asilidse; Nausigaster punctulata n. g. and sp. of 

 Syrphidse. 



The North American Species of Nemestrinidae. Canadian Entomologist, xv, 

 69-72, fig. ; 1883. 



Rhynchocephalus volaticns n. sp., from Fla. ; table of species. 

 North American Conopid?e. Transactions of the Conn. Acadeim : 

 I. Conops. Vol. iv, 325-342, i plate; 1883. 

 II. Stylogastcr, Dalnwnnia, Oncoinyia. Vol. vr. 87 94; 1884. 

 III. Conclusion. Vol. vi, 377-394, I plate; 1885. 



In these three numbers are tables of genera and species old species re- 

 described, and several new; practically a monograph of the family. 



The Screw-worm Fly. Psyche, 1883, 132. 



Notes on Chrysoinyia inacellaria FAB. 



Eine Merkwiirdige neue Syrphiden-Gattung. Wiener Enlom. Zeittmg, in, 

 185, 1 86, 1884. 



Euccratouiyia pcrgandei n. g. and sp., from D. C. 

 Note on the Genus Merapioidus Bigot. Wiener Entom. Zeitung, in, 282, 



1884. 

 Dipterous Larvae from the Western Alkaline Lakes, and their Use as Food. 



Transactions Conn. Academy, vi, 83-86; July, 1884. 



Ephydra calif or nica PACK., described, larva figured. 



