126 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



CHALCOMYIA.* 



Chalcomyia Willistnn, Bull. Brooklyu Entoiii. Soc, vol. vii, p. 133. 

 Moderate sized, nearly bare, metallic bronze species. Eyas bare, 

 broadly separated in the male. Antennae situated upon a strong coni- 

 cal projection, especially in the male, first two joints short, third orbicu- 

 lar ; arii'ta basal, bare. Face in the male gently convex from below the 

 antennal i)rocess; in the female concave from the autennfe to the tip, 

 but most so below the middle ; face produced but little below the eyes. 

 Scutellum large and projecting, nearly square, with the outer angles 

 rounded, thinned ou the margin, and shallowly grooved on the disk. 

 Abdomen flattened, broadly oval in outline. Legs rather stout; hind 

 femora moderately thickened; hind tibia? gently arcuate ; hind meta- 

 tarsi as long as the four following joints, not thickened. Marginal cell 

 of wing open, third longitudinal vein nearly straight, anterior cross- 

 vein oblique, situated a little before the middle of the discal cell. Type 

 of genus C. aerea Loew, North America. 



Chalcomyia aerea. (Plate IV, iig-. 14.) 



Myiolfpla aeiea Loew, Ceutur., x, 53. 



Habitat. — Virginia! Illinois (Lw.). 



S , 9 . Length, 6 to 7"^'". Greenish bronze-color, shining, clothed with 

 short yellow x)ile. Front of the female with a whitish pollinose cross-band, 

 narrowly interrupted ; male with a narrow, obsolete cross-band, extend- 

 ing narrowly down along the eyes. Margin of the antennal process afc 

 the base of the antennse red. First two joints of the anteunfe reddish- 

 brownish, third joint more brownish-reddish, blackish on the upper part j 

 arista luteous. Face in the female shining black, except a yellowish 

 pollinose stripe that runs from the eyes obliquely to the oral margin ; in 

 the male the sides of the antennal process and the face below the pro- 

 cess thickly covered with satiny yellowish pubescence, when viewed 

 from above, wholly concealing the ground color, and changeable in dif- 

 ferent lights, the under side of the process showing the groundcolor 

 more distinctly. Anterior margin of the thorax white pollinose. Ab- 

 domen more bronze-colored, with yellow pile, longer on the sides in front. 

 Legs black, extreme ti[) of the femora, basal third of the tibire, and first 

 three joints of the tarsi reddish-yellow ; hind femora in the male a little 

 more thickened than in the female and with a slight i)rotuberance below 

 near the base. Wings sublutescent, the veins near the tip and posterior 

 margin fusoous. 



Two specimens. Virginia (Mr. Theo. Pergande). 



* Xa^/coc, copper, and fivia, fly. 



