336 THE CANADIAN ENTOMOLOGIST 



NEW AND LITTLE-KNOWN CANADIAN OSCINID.'E.* 



BY J. M. ALDRICH, BUREAU OF ENTOMOLOGY, 

 U. S. DEFT. OF AGRICULTURE. 



In 1915 and 1916 the writer received for study many lots of 

 small flies swept by Mr. Norman Criddle at Aweme and Trees- 

 bank, Manitoba, on grains and grasses. In a few cases he added 

 material from other points. These accumulations came to repre- 

 sent the Oscinid fauna of the region quite fully, and to contain 

 several undescribed species in some numbers. It is the purpose 

 of the present paper to describe a few of the most abundant species 

 and to clear up some obscurities about several genera and species; 

 it does not by any means exhaust the material which Mr. Criddle 

 furnished with infinite industry, persistence and patience. 



Type material in all the species will be deposited in the Cana- 

 dian National Collection, and also in the United States National 

 Museum.. 



Lasiosina Beck. 



This genus, described by Becker in 1910 in the first part of 

 his Monographic der Chloropiden (Archivum Zoologicum, 1, 73), 

 has for its type Chlorops cinctipes Meig, (Diplotoxa inconstans 

 Lw.), and originally included two other European species. Two 

 of the three had been described in Diplotoxa by Loew, the other 

 being new. 



The genus, therefore, represents a subdivision of Diplotoxa, 

 from which as restricted it difi^ers in having longer thoracic and 

 frontal bristles, and the cross veins less approximated, separated 

 by about twice the length of the hind one. 



Becker did not see any North American material. The first 

 species to be found on this continent was a single female from 

 Springer, N.M., in the National Museum, which Malloch de- 

 scribed (Proc. U. S. N. M., XLVI, 140, 1913) as Euchlorops similis, 

 placing it in the Milichinae. From Euchlorops vittata, the type 

 species of the genps, similis differs in having tyt one dorsocentral 

 bristle, the former having a row of four. I have exanrined both 

 types and also the European L. albipila Lw., the last in Professor 

 Melander's collection. We have a common northern species which 

 has come into my possession only since I saw the type of similis; 



October, 1918 



