SYNOPSIS OF NORTH AMERICAN SYRPHID^. 183 



Black, opaque. Head of the same color, the lateral margins of the 

 front, and the face, except the median stripe, white pollinose. Antennae 

 black, third joint ovate. iScntellum livid, near the base black. First 

 segment of the abdomen, except the base, white pollinose; second seg- 

 ment with a livid fascia, narrowly interrupted, toward the sides strouglj' 

 dilated, but abruptly cut off before reaching the margin, hind margin 

 yellow ; the two following segments, each with a narrow basal fascia 

 yellow tomentose, and the posterior margin vitelline yellow. Hypopy- 

 gium thickly clothed with vitelline pollen. Legs vitelline yellow ; 

 front femora wholly, the base of the middle femora, and the hind fe- 

 mora, except che distal third, black; the hind femora black setulose 

 below, elsewhere the legs wholly clothed with light pile. Wings pure 

 hyaline, all the veins fuscous-black, stigmatic cell, the marginal and 

 submarginal cells blackish. — Translation. 



ADDITIONAL NORTH AMERICAN SPECIES. 



Pteroptila pratorum. 



Siir2)hi(s i)raiorum Fabricius, Syst. Eut., 765, 13; Ent. Syst., iv, 286, 31. West 

 Indies. 



Eristalis pratorum Fabricius, Syst. Ant., 236, Id; Wiedemann, A. Z., ii, 166. 

 Pteroptila opulentus Bigot, Ann. Soc. Ent. de Fr., 336 {Eristalis). Cuba. 



HELOPHILUS.* 



Elophilus Meigen in Illigers Magazine, ii, 274, 1803. 



Asemosyrphns Bigot, Bull. Soc. Ent. deFr., No. 13, 1882. 



EurUmyia Bigot, Bull. Soc. Ent. de Fr., No. 2, 1883. 

 Mostly large, nearly bare species, black or blackish brown, with yel- 

 low spots or bauds, usually readily distinguished by the presence of 

 light pollinose stripes on the dorsum of the thorax ; head hemispherical, 

 not flattened. Antennae short, the third joint oval ; arista basal, bare. 

 Face below the antennaB in profile gently or considerably excavated, the 

 lower part sometimes strongly produced, usually with a tubercle; eyes 

 bare, rarely pilose, separated by a rather broad interval in the male. 

 Scutellum usually more or less translucent. Abdomen sometimes rather 

 broadly oval, often more or less narrowed, sometimes cylindrical. Legs 

 rather stout; the hind femora more or less thickened, and the hind 

 tibiae arcuate; hind coxjb in the male rarely with a spinous tubercle be- 

 low. Marginal cell of the wings open ; the third longitudinal vein deeply 

 bent into the first posterior cell; small cross-vein oblique, beyond the 

 middle of the discal cell. 

 See Appendix. 



'iJAiof, the sun, and (piXog, a lover. 



