ART. 9 TWO-WIXGED FLIES OF TEIBE MILTOGEAMMINI ALLEN 39 



Male. — Front at narrowest 0.37 of the head width (measurements 

 of three 0.36, 0.36, 0.38) ; orbits most nearly approximated at base of 

 antennae, diverging shghtly above, widely below, with a slight 

 emargination at the level of vibrissae; front and face silvery poUinose, 

 frequently grayish or golden poUinose at the vertex; frontal vitta 

 triangular, yellowish, submerged posteriorly beneath dense pollen; 

 frontal rows with about nine bristles, separated at middle by distance 

 almost equal width of parafrontal; one reclinate and two proclinate 

 orbital bristles; parafrontals destitute of bristly hairs; vibrissae 

 strongly approximated, nearly the length of second antennal joint 

 above the front edge of oral margin; facial ridges with two or three 

 bristly hairs on their lowest fourth; antennae red, extending seven- 

 eighths distance to vibrissae, third joint five times as long as the 

 second; arista tliickened nearly to tip, penultimate joint slightly 

 longer than broad; parafacials bare; in profile, width of bucca equals 

 parafacials and is one-tenth eye height, head length at vibrissae is 

 distinctly less than at base of antennae, front projects more than 

 one-tliird eye width; palpi yellow. Thorax gray poUinose over black, 

 without distinct vittae; two postsutural dorsocentral bristles are dis- 

 tinguishable; two sternopleurals present; the scutellum bears three 

 marginal pairs of which the apicals are the strongest; weak preapicals 

 present. Abdomen largely red, fourth segment black, the third partly 

 so; last three segments with thinly poUinose bands on their basal half; 

 first two segments without bristles, third and fourth with marginal 

 rows of about ten weak ones. Genitalia black, in repose, protruding 

 from abdomen for distance equal to one-half the length of fourth 

 abdominal segment. Wings without costal spine; tliird vein with a 

 single small bristle at its base. Legs black; middle tibia with a single 

 bristle on outer front side near middle; hind tibia on outer surface 

 with several weak bristles on proximal three-fifths. 



Female. — Front at narrowest 0.29 of the head width (measurements 

 of three 0.28, 0.29, 0.30); frontal vitta narrower than in the male; 

 frontal rows at their middle separated by a distance equal to two- 

 thirds width of parafrontal; distance of vibrissae above the oral 

 margin fully equals the second antennal joint; vibrissae more strongly 

 approximated than in male; third antennal joint two and one-half 

 to three times the second. Otherwise, except for the usual sexual 

 differences of the pulvilli and genitalia, like the male. 



Length 3.0 to 6.0 mm. 



Typg.— Male, Cat. No. 3755, U.S.N.M. 



Host relationships. — Unknown. 



Redescribed from the type, and two males and one female of the 

 type series from Holly Springs, Mississippi (F. W. Mally) ; one 

 male, Lafayette, Indiana (J. M. Aldrich) ; one female, Owen's Lake, 

 California (J. M. Aldrich) ; all in the collection of the National 



