614 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



fifths as long as the face, the third joint only slightl}' longer than the 

 second, arista bare, proboscis small, about half as long as height of 

 head, palpi at apex each bearing a black bristle as long as the palpi, 

 costa of wings destitute of bristly spines. 

 T^j>e., the following species: 



PLETHOCHiETA VARICOLOR, new species. 



Head yellow, an ocellar spot and a transverse spot above center of 

 occiput, black; face, cheeks, and sides of front whitish pruinose, frontal 

 vitta dark yellow, changing above into yellowish brown; antennae 

 brownish black, the first two joints yellow; proboscis black, palpi 

 yellow; thorax black, opaque, gray pruinose, the humeri and hind 

 angles reddish 3'ellow, pteropleura bare, scutellum reddish 3'ellow, the 

 upper surface brown, bearing a few short bristly hairs, a pair of very 

 long submedian bristles, a pair of short basal ones, and a short apical 

 pair; abdomen reddish yellow, the hind margins of first three segments 

 and the genitalia brownish; legs 3'ellow, tarsi brownish, front tibia? 

 each V)earing one bristle on the front and one on the hind side, middle 

 tibia' with one on the inner, one on the front, and two on the hind side, 

 hind tibia? with one on the inner, three on the front, and four on the 

 hind side; wings grayish h^'aline, unmarked, halteres yellow; length, 

 8 mm. A female specimen, collected August 19, 18t»2, b}- Mr. C. W. 

 Johnson. 



Habitat . — Delaware Count}^ Pennsylvania. 



Type.— Cat No. 5499, U.S.N.M. 



Family HELOMYZID^E. 



ANOROSTOMA OPACA, new species. 



Head yellow, opaque, white pruinose, the front and upper part of 

 the occiput tinged with bluish gray, a velvet black spot between the 

 antenna? and each eve, antennae brownish, the arista marked before 

 its middle with a white ring, palpi vellow, proboscis brown; body 

 brown, opaque, bluish gray pruinose, mesonotum with four, the 

 pleura with one brownish pruinose vittje; sternopleura bearing numer- 

 ous short bristly hairs and with two stout bristles; legs yellow, 

 opaque grayish pruinose except a polished spot at base of the poste- 

 rior side of the first two pairs and a streak on the posterior side of the 

 hind ones; wings whitish, marked with large pale gray spots and with 

 a black cloud covering the small and hind crossveins, a small black 

 spot beneath apex of auxiliar\' vein, one slightly before middle of 

 antepenultimate section of the fourth vein, and several smaller spots 

 on some of the other veins; the gray color fills the whole marginal 

 cell beyond apex of auxiliary vein, nearly the entire second half of 



