54 



the eye-beiglit, abdomen of female tliickly beset with short 

 spines on under sides of the third and fourth segments; length, 

 8 to 10 mm. Maryland, Dist. Columbia, and Virginia. (List 

 Dipt. Insects, Part IV, p. 77!); 1849: Tachma.). .demijUis Walk. 



3. Palpi black^hird antennal joint in the male eight, in the female 

 from five to seven, times as long as the second; cheeks at least 



p >&- . one-half as wide as the eye-height, front tarsi of female greatly 

 <^ Au^U^Ct^^^ dilated, abdomen destitute of stout spines on the underside. 4, 

 u. -v,-«,^-xcc? Palpi yellow, insect otherwise black; front of male as wide as either 

 ^ 'U' ir-u>*.ut,Zi^ gyg^ frontal bristles descending to apex of second antennal 

 Ax-^-c • ^ 5 uj . joint, the pair in front of vertical ones not directed outward, 

 cheeks one-third as broad as the eye-height, sides of face at 

 narrowest part each one sixth as wide as the median depression, 

 each bearing a row of bristly hairs, vibrissa', on a level with front 

 edge of the oral margin, ridges bristly on the lowest fourth, 

 antenn;ie as long as the face, the third joint four times as long as 

 the second, arista thickened on the basal third, the pennltimate 

 joint as broad as long; thorax gray pollinose, marked with four 

 ^djy\J^uM^ c:;,^^^ black vitta^, scutellum bearing three pairs of long marginal and 

 a ' ^ a very short apical pair of macrocha^t;e ; abdomen thinly gray 

 pollinose, first segment bearing marginal, the others discal and 

 marginal macrocha^tiie ; front pulvilli scarcely one-half as long as 

 the last tarsal joint; wings hyaline, third vein bearing three 

 bristles near the base, calypteres white; length, 5 mm. Ala- 

 meda, Cal. Two males bred April 17, 1888, from chrysalids of 

 Retinia sp. by Mr. Albert Koebele. Type ^o. 3532, U. S. 

 I^ational Museum retinue n. sp. 



4. Front in the male one and one-third times, in the female twice, as 

 wide as either eye; the pair of frontal bristles in front of the ver- 



ow»-c-'*t^«. *^ tical ones directed obliquelj^ outward, arista thickened on the 



-' -^^^ , basal three-fifths, sides of face each bearing numerous hairs not 



arranged in a single row, the sides yellowish gray pollinose; 



length, 5 to 8 mm. Prom the type specimen. Beverly, Mass.; 



District of Columbia, and Agricultural College, Miss. (Journ. 



N. Y. Ent. Soc, Vol. Ill, p. 54; June, 1895.) pergandei Coq. 



Front in tlie male slightly wider than, in the female one and one- 

 fourth times as wide as, either eye; the pair of frontal bristles 

 in front of the vertical ones almost perpendicular, arista thick- 

 ened on the basal two-fifths, sides of face white pollinose, each 

 bearing a single row of hairs; length, 5 to G mm. From the 

 type specimen. Franconia, N. H. ; Beverly, Mass. ; District of 

 Columbia; Illinois, and Tifton, Ga. (Journal N. Y. Ent. Soc, 

 Vol. Ill, p. 58; June, 1895: Hypostena.) degeerioides Coq. 





