ART. 9 TWO- WINGED FLIES OF TRIBE MILTOGRAMMINI ALLEN 31 



apex of fourth segment which is black, in profile, distinctly arched; 

 without macrochaetae, save for the scarcely differentiated marginal 

 pairs on third and fourth segments; last three segments with a 

 thinly pollinose band confined to basal third of the segment. Geni- 

 talia black; in repose, exserted for distance about equal to width of 

 fourth abdominal segment; inner forceps elongate, in profile, curved 

 slightly forward to a strong, sharp point, from behind, are seen to 

 be united into a single laterally compressed process, linear like the 

 back of a knife blade. Wing of usual veination, without costal 

 spine or bristles at base of third vein; proximal half of costa with 

 short, appressed, black hairs. Legs black; pulvilli of fore feet 

 longer than last tarsal joint; middle tibia with one bristle on outer 

 front side near middle; hind tibia with but two bristles on outside 

 near the middle. 



Length, 3 to 4 mm. 



Type.— Male, Cat. No. 3580, U.S.N.M. 



Host relationships. — Unknown. 



Redescribed from the type and the paratype, labeled "swept from 

 Pedis papposa,^' Las Cruces, New Mexico (Cockerell), and one male 

 specimen from Los Angeles County, California, all in the National 

 Museum. Female unknown. 



SENOTAIMA SETULICOSTA, new species 



Male. — Front at narrowest 0.30 of head width (measurements of 

 two as follows: 0.29, 0.31); inner orbits converge moderatel}^ from 

 vertex to the base of the antennae, thence divergent in a broad curve 

 to the bucca; front golden pollinose; frontal vitta yellow, linear, 

 scarcely the v/idth of ocellus to above the middle, thence diverging 

 rapidly to vertex; frontal rows of about ten weak bristles, separated 

 at their middle by a distance less than one-half width of para- 

 frontal; one reclinate and two proclinate orbital bristles; para- 

 frontals sparsely beset with black bristly hairs; vibrissae strongly 

 approximated, inserted at distance equal to second antennal joint 

 above front edge of oral margin; facial ridges bare save for one or 

 two bristly hairs above the vibrissae; antennae red, extending about 

 two-thirds distance to vibrissae; third joint equal to second; arista 

 thickened on basal two-fifths, penultimate joint very short; para- 

 facials bare; in profile, the buccal width is much less than that of 

 parafacials, and equals one-sixth to one-tenth the eye height; head 

 length at vibrissae equals that at base of antennae; front projects 

 nearly one-half the eye width; palpi yellow. Abdomen strongly 

 arched in profile, red, excepting apex of fourth segment which is 

 black; broad pollinose bands encircle the basal halt of the last three 

 segments; abdomen without macrochaetae save for a weak median 

 marginal pair on the third and fourth segments. Genitalia black; 



