OF WASHINGTON, VOLUME XIV. 1912.- 125 



6. Wings hyaline, or sometimes smoky costally . 7 

 Wings subhyaline to small cross-vein, the remainder brown 



except the hind margin; front in the female one and one- 

 fourth times as wide as either eye; parafrontals, parafacials, 

 and the cheeks yellowish-gray pollinose; sides of face each 

 one-third as wide as the median depression; bristly hairs 

 on the sides of face not arranged in a single row; facial 

 ridges bristly on the lowest two-fifths to three-fifths, third 

 antennal joint in the female five to seven times as long 

 as the second; arista thickened on the basal half, the 

 penultimate joint twice as long as broad; thorax dusted 

 yellowish-gray pollinose; the first abdominal segment 

 bearing a pair of marginal macrochaetae; the others bearing 

 both discal and marginal macrochaetse; hairs of abdomen 

 long and depressed; the third vein bearing a single bristle 

 at its base. Length, 7 mm. 2 females from Algonquin, 

 Illinois, and National Park, New Jersey. Type: 3538, 

 U. S. National Museum. (Journ. N. Y. Ent. Soc., vol. 

 Ill, p. 55, June, 1895) nasoni Coq. 



7. Abdomen bearing discal macrochaetse; the third vein bearing 



more than one bristle at its base 8 



Abdomen not bearing discal macrochaetse; the third vein 

 bearing a single bristle at its base; front in both sexes 

 slightly wider than either eye; frontal bristles descending 

 scarcely below base of second antennal joint; sides of face 

 each one-fifth as wide as the median depression; facial 

 ridges bristly on the lowest fourth; parafrontals and 

 the parafacials grayish-white pollinose; the first two an- 

 tennal joints yellow; the third jr.int three to four times 

 as long as the second; thorax grayish-white pollinose; 

 apical cell usually closed in the margin of the wing. Length 

 7 mm. One male and 5 females from Opelousas, Louisiana. 

 Type, 4062 U. S. National Museum. (Can. Ent,, vol. xxx, 

 p. 234.) unispinosa Coq. 



8. Antennse black; front in the male as wide as, in the female one 



and one-fourth times as wide as either eye; parafrontals 

 and the parafacials grayish white pollinose; cheeks nearly 

 one-half as wide as the eye height; facial ridges bristly 

 on the lowest one-third; the third antennal joint at least 

 four times as long as the second; arista thickened on the 

 basal two-fifths; penultimate joint usually twice as long 

 as broad; orbital bristles present in both sexes; thorax gray 

 pollinose. Length, 5 to 6 mm. 2 males and 2 females 

 from District of Columbia and Beverly and Dorchester, 

 Massachusetts. (Jour. N. Y. Ent, Soc., vol. ill, p. 58, 

 June, 1895. Hypostena} degeerioides Coq 



