AKT. 9 TWO-WINGED FLIES OF TEIBE MILTOGKAMMINI ALLEN 99 



with its front edge concave and its length five times that of second; 

 arista thickened on basal three-fifths; facial ridges l)are; parafacials 

 bare or with almost imperceptible hairs; vibrissae inserted at less 

 than half the length of second antennal joint above front edge of 

 oral margin; in profile, head length at vibrissae distinctly less than 

 at base of antennae, buccal width equaling one-fourth eye height; 

 proboscis distinctly shorter than head height; palpi yellow and mod- 

 erately calvate at tip. Thorax black, overlaid with gray pollen, 

 tinged with bronze on notum; two widely separated broad black 

 vittae, and occasionally a narrower indistinct median one; scutellum 

 with three pairs of marginal bristles, the nearly ec[ual apical and 

 lateral pairs both smaller than the intermediate pair. Abdomen 

 black, last three segments polished on their broad apices, white 

 pollinose bands on anterior half of the segments which are not 

 sharply defined from the black and are prologned laterally and 

 ventrally to near median ventral line; abdomen clothed with usual 

 black appressed hairs which extend well into the pollinose areas 

 from behind; first segment without bristles, second with one lateral 

 and one strong median marginal pair, third and fourth each with 

 uninterrupted marginal rows of about eight, the bristles of the third 

 scarcely equalling those of the fourth segment. Genitalia in repose, 

 largely concealed within abdomen, normally extruding one-fourth 

 length of fourth abdominal segment; claws of inner forceps fhxttened 

 and united near the tip; outer forceps becoming slender near apex, 

 then suddenly expanded into sharp-pointed, plow-shaped tips. 

 Wings slightly infuscated; section of fourth vein beyond bend 

 strongly arcuate; liind cross vein oblique to last section of fourth vein 

 which it joins about two-fifths distance from the bend to the small 

 cross vein; a small costal spine present; three to five small bristles 

 on third vein extending about half way from its base to small cross 

 vein. Legs black; pulvilli of fore feet varying from subequal to 

 slightly longer than last tarsal joint; middle tibia with one bristle 

 on outer front side near middle; hind tibia on outside with two or 

 three unequal bristles not extending far beyond the middle. 



Female. — Front at narrowest 0.385 of head width (in two specimens 

 measuring 0.38 and 0.39 respectively) ; third antennal joint three and 

 one-half to four times length of second. Genitalia of usual non- 

 piercing type almost wholly concealed within the abdomen. Other- 

 wise like the male. 



Length, 4.0 to 6.0 mm. 



Host relationships.— Unknown. 



Redescribed from the type which is a male from southern Florida, 

 loaned from the LTni versify of Kansas Museum and several other 

 specimens as follows: In the collection of the National Museum, 

 one female from southern Florida labeled " Gymnoprosopa" ; one 



