No. I.] SOMJ-; MUSCINAE OF NORTH AMERICA. 



FIG. 3. 



below and entirely without hair. Wiedem ami's description of 

 Idia viridis is based on one poorly preserved and greasy speci- 

 men and reads : " With black antennae, everywhere bronzy 

 green, with hyaline 

 wings and blackish 

 legs. Face and front 

 rusty brown, the green 

 color dark, tending to- 

 ward emerald green." 

 Hcmichlora has the 

 pectinate arista, a 

 slightly prominent oral 

 margin, and is in part 

 of a metallic blue color. 

 A metallic blue color 

 may vary to metallic 

 green. Certainly Hem- 

 ichlora vittigera comes nearer to the description of Idia 

 viridis than any other known North American Muscid. No 

 other Idia has been described from North America, and only 



the original specimen 

 O f / viridis is known. 

 Myospila. - - There is 

 but one known North 

 American species, J/. 

 incditabunda Fabr. 

 (Fig. 3). It is com- 

 mon to Europe and 

 America. Many of 

 our specimens have the 

 pubescence of the eyes 

 very short ; in the fe- 

 males sometimes it is 

 very difficult to make 

 out with an amplification of twenty diameters. No other 

 difference am I able to find between European and Ameri- 

 can specimens. It seems to me very probable that Cyrtoncnra 

 quadrisetosa Thomson (Eugcn. Rcsa, p. 549) is one of those 



