128 DIPTERA OP NORTH AMERICA. 



Observation. The genera Actora and Dryomyza, differing in 

 some characters from the true Sciomyzidae, are not comprised in 

 the above exposition. I have not seen the N. A. Actora, pub- 

 lished by Mr. Walker as Actora ferruginea. The two N. A. spe- 

 cies of Dryomyza I .know, fall both into that section which is 

 characterized by a hairy third longitudinal vein ; the first is, as it 

 seems, identical with the European Dryomyza anilis Fall. ; the 

 second, though resembling in its colors Dryomyza flaveola Fabr., 

 may easily be identified by the subjoined description. 



Dryomyza simplex LOEW. Pallide flava, nitens, fronte et an- 

 tennis saturate flavis, opacis ; alse cinereo-hyalinse, vena longitudinal! 

 tertia pilis longis vestita. Long. corp. 0.28. Long. al. 0.31. 



Polished, pale yellow. Front deeper yellow, opaque, with the 

 short pubescence and the bristles black. Antennas concolorous 

 with the front; antennal bristle with rather long and black hairs. 

 Wings limpid, with a distinct yellowish-gray tinge ; the third 

 longitudinal vein beset with long hairs; the posterior transverse 

 vein obsoletely clouded with grayish, the small transverse vein not 

 clouded. 



Hob. Middle States. (Osten-Sacken.) 



