ART. 9 TWO-WINGED FLIES OF TRIBE MILTOGRAMMINI ALLEN 59 



facial ridges. Thorax gray pollinose, golden tinged, with three nar- 

 row, black median and two broad lateral vittae; scutellum with three 

 pairs of marginal bristles of about equal size. Abdomen black, with 

 a large yellowish spot extending over the sides of the first two and 

 sometimes the third segments; basal two-thirds of last three segments 

 gray pollinose when viewed from rear, the gray interrupted by black 

 median dorsal V-shaped emarginations ; first segment usually lacking 

 macrochaetae, second and third each with a median marginal pair, 

 fourth with a marginal row of about eight. Genital segments black, 

 subshining, s])arsely covered with black bristly hairs; in repose, 

 retracted within the last abdominal segment; inner forceps small, 

 black, densely covered at base with fine black hair, claws tapering 

 to slender curving points, divergent at tips, and when viewed from the 

 rear display no angle on the outside near the base; outer forceps 

 brown, shining, larger and stouter than the inner pair; anterior 

 claspers unusually long, more slender than the largest of the abdominal 

 bristles, curved forward and slightly enlarged at the extreme tip. 

 Wings hyaline ; fourth vein veyond the ])end shghtly arcuate and nearly 

 parallel to hind cross-vein; third vein with a row of small bristles, 

 extending in some specimens more than half way to small cross- 

 vein. Legs black, trochanters and frequently the upper part of 

 femora yellow; second, third, and fom-th joints of fore tarsus each 

 with an erect bristly hair on the upper surface ; fourth joint much 

 reduced; middle tibia lacking macrochaetae on outer front side near 

 the middle; hind tibia on outside with an uneven row of five to nine 

 bristles extending from base to apex. 



Female. — Front at narrowest 0.33 of head width (measurements of 

 three 0.31, 0.33, 0.35 respectively); frontal vitta pollinose, nearly 

 concolorous with parafrontals. Genitalia nonjuercing, in repose 

 inconspicuously telescoped within the fourth abdominal segment. 



Length 3.5 to 6.0 mm. 



Specimens have been examined in the collections of the National 

 Museum, Nathan Banks, and the writer, from the following localities: 

 One female. White Mountains, New Hampshire (Morrison), type of 

 Parametopia morrisoni Townsend; one male, Melrose Highlands, 

 Massachusetts, July 31, and one female, West Springfield, Massachu- 

 setts, July 13, 1915 (H. E. Smith); two males and two females, 

 Lafayette, Indiana; one male, Columbus, Ohio, Aug. 4, 1921 (H. W. 

 A.) ; one male, New York, late July; one male, Linnieville, Maryland, 

 July 4, 1913, and one female. Cabin John, Maryland (R, C. Shannon); 

 one female, Rock Creek, District of Columbia (C. H. T. Townsend); 

 three males. Chain Bridge, Virginia, August 12, 1923 (H. W. A.); 

 eight females and two males, Fall Church, Virginia (N. Banks) ; 

 one female, Lawrence, Kansas; one female, Birmingham, Alabama, 

 June 4, 1917 (J. M. Aldrich) ; one male, Agi'icultural and Mechanical 



