ART. 9 TWO- WINGED FLIES OF TRIBE MILTOGKAMMINI ALLEN 61 



or at most represented by rudimentary stubs. Thorax gray pollinose 

 over black, the notum subshining, distinctly tinged with bronze, 

 with three narrow median and two broad lateral vittae, the lateral 

 one extending beyond the transverse suture; scutellum with three 

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

 broadl}^ yellow on the sides of the first three segments, last three 

 segments gray pollinose except for the narrow apices which are 

 shining black, and a narrow dorsal vitta on the second and third 

 segments; first segment without bristles, second and third segments 

 each with a strong median marginal pair, third sometimes with a 

 weak lateral bristle, fourth with a marginal row of six to eight bristles. 

 Genitalia black; first genital segment slightly larger than the second; 

 the subdiscal part of the first, the second and the base of the inner 

 forceps clothed with black hairs somewhat finer than those of the 

 abdomen; two small apical bristles on the first segment; inner forceps 

 expanded laterally into a small but distinct angle near the base, 

 plainly seen from the rear; anterior claspers extremely long, boomer- 

 ang-shaped, not expanded at the tip, much stouter than the abdom- 

 inal macrochaetae. Wings hyaline; section of fourth vein beyond 

 bend moderately arcuate and nearly parallel with hind cross vein; 

 last section of fifth vein less than half as long as preceding section; 

 third vein bristly more than half way to small cross vein. Legs 

 black, the trochanters, upper half of the femora and the front tibia 

 usually yellow; front tarsus without conspicuous bristles or long 

 hairs; middle tibia lacking bristles on outer front side near middle; 

 hind tibia on outside with four or five bristles extending beyond the 

 middle. 



Female. — Front at narrowest 0.32 of head width (measurements of 

 four 0.31, 0.32, 0.32, 0.33, respectively). Otherwise like the male 

 except for the usual differences in external genitalia. 



Length, 4.5 to 6.0 mm. 



Described from the following material. In the collection of the 

 National Museum, one male, North Wilbraham, Massachusetts, Aug. 

 15, 1916 (D. A. Ricker) ; one male and four females from Lafayette, 

 Indiana, one male, Chesapeake Beach, Maryland, June 21, 1923 

 (J. M. Aldrich) ; one female, Cupid's Bower Island, Maryland, July 

 8, 1915 (R. C. Shannon) ; one male. Chain Bridge, Virginia (H. W. 

 A.); one male, Onaga, Kansas; one female, Opelousas, Louisiana, 

 May, 1897. From Glen Echo, Maryland, one male, July 1, 1923, 

 one male, August 10, 1923, one male, Aug. 21, 1923, one male and 

 one female, Aug. 30, 1923, in the collection of J. R. Malloch. One 

 male. Fort Andrews, Ohio, June 10-12, 1902; one male, Vinton, Ohio, 

 June 5--12, 1900; two females, Cincinnati, Ohio; two from Hinkley, 

 Medina County, Ohio; one from Wauseon, Oiiio, Sept. 2, 1902; in the 

 collection of Prof. J. S. Iline. One male. Dead Run, Fairfax County, 



