34 ENT. PROC. soc. WASH., VOL. 22, NO. 2, FEB., 1920 



DESCRIPTIONS OF NEW GENERA AND SPECIES OF 

 SCATOPHAGIDAE (DIPTERA). 



BY J. R. MALLOCH. 



The descriptions presented herein are those of species which 

 have been in my hands for two or three years, the material having 

 been obtained from various sources to enable me to draw up a 

 key to the North American genera which recently appeared in 

 the Report on the Canadian Arctic Expedition, 1913-18, Volume 

 3, page 75, 1919. 



The type of Pseudopogonota aldrichi is in the collection of Dr. 

 Aldrich, those of the other species are in the collection of the 

 State Natural History Survey of Illinois. 



Scatophaga grisea, sp. n. 



Male and Female. -Black, very slightly shining, densely gray pruinescent. 

 Interfrontalia, face, anterior half of cheeks, and basal half of palpi reddish 

 yellow. Thorax with four brown vittae. Abdomen without dorsal mark- 

 ings. Legs reddish testaceous, coxae, and the femora except their apices, 

 black, gray pruinose. Wings slightly grayish, veins yellow basally, brown 

 apically, cross-veins slightly darkened. Calyptrae and halteres pale yellow. 



Female. Head when seen from in front nearly twice as wide as high at 

 center; frons half as wide as head, about as long as wide; orbits wide, each 

 with about five infraorbital and three supraorbital bristles and some soft short 

 hairs; parafacial linear below; cheek about one- third as high as eye, the posterior 

 portion of lower margin with soft pale hairs, only the vibrissal angle with 

 strong black bristles (5); antennae with third joint about twice as long as 

 second; arista with short pubescence. Thorax with sparse short hairs, the 

 bristles not strong; presutural acrostichals weak, in about six rows; stigma tal 

 and propleural bristles absent; ventral prothoracic plate very narrow, not 

 broadened anteriorly; propleura hairy in part. Abdomen with second ter- 

 gite longest. Legs stout, the femora noticeably so; bristles absent from 

 femora; fore tibia with a series of long, fine hairs on postero-dorsal surface, 

 and a long bristle beyond middle on antero-dorsal surface; mid tibia with one 

 or two antero-dorsal, one postero-dorsal, and sometimes one posterior bristle; 

 hind tibia with two or three antero-dorsal, and two postero-dorsal weak bris- 

 tles; tibial spurs weak, not curved. First wing-vein bare; sixth vein complete; 

 veins 3 and 4 slightly convergent apically. 



Male. Similar to female in color and habitus. The fifth sternite with 

 two moderately stout lateral processes which have numerous soft pale hairs 

 along their inner halves; hypopygium small. 



Length 5-5.5 mm. 



