176 THE CANADIAN ENTOMOLOGIST 



takes to decide a matter of this kind, it is always best to give the 

 reasons why such decisions are arrived at. Having been engaged 

 upon some work on the American species in this family, I find that 

 it is necessary for me first of all to decide upon the correct nomen- 

 clature, both of genera and species, before I can publish any de- 

 scriptive matter or give identifications of species to be used in the 

 publications of the Bureau of Entomology. Thus, I have under- 

 taken the rather unwelcome task of revising the nomenclature of 

 the group, in so far as the American genera are concerned, in the 

 hope that such revision may be of use to other students of the family. 



Family Chloropida? 

 Subfamily Chloropinae. 



Elliponeura Loew, Berl. Ent. Zeitschr., Vol. 13, 1869, p. 44. 



Type: Elli p07ieiira debilis hoew. 

 Meromyza Meigen, Syst. Beschr. Zweifl. Ins., Vol. 6, 1830, p. 163. 



Type: Musca saltatrix Linne. 

 Cetema Hendel, Wien. Ent. Zeit., Vol. 26, 1907, p. 98. 



Centor Loew, Zeit. Ent. Breslau, Vol. 15, 1866, p. 7 (pre-occ.) 



Type: scinis cerccris FaWen. 

 Anthracophaga Loew, Zeit. Ent. Breslau, Vol. 15, 1866, p. 15. 



Type: Musca strigida Fabricius. 

 Haplegis Loew, Zeitschr. Ent. Breslau, Vol. 15. 1866, p. 22. 



Type: Chlorops diadema Meigen. 

 DiPLOTOXA Loew, Zeitschr. Ent. Breslau, Vol. 15, 1866, p. 31. 



Type: Chlorops versicolor Loew. 

 Chlorops Meigen, Illig. Mag., Vol. 2, 18u3, p. 278. 



Type: Chlorops laeta Meigen. 



Coquillett gives this genus as synonym of Titania Meigen, 

 1800, presumably on the strength of Hendel's representations in 

 his paper dealing with Meigen's genera (Verh. Zool. bot. Ges. 

 Wien., Vol 58, 1908, p. 43.), but, as Hendel afterwards points out 

 (Wien. Ent. Zeit., Vol. 29, 1910, p. 312), Titania is more probably 

 synonymous with Gaurax Loew. 

 Chloropisca Loew, Zeitschr. Entom. Breslau, Vol. 15, 1866, p. 79. 



Type: Chlorops glabra Meigen. 

 Eurina Meigen, Syst. Beschr. Zweifl. Ins., Vol. 6, 1830, p. 3. 



This genus has been recorded as occurring in America, but the 

 species included in it from this country is not congeneric with the 



