78 THE CANADIAN ENTOMOLOGIST 



Third antennal joint and palpi not blackened, rarely the 

 former brownish at insertion of arista 11 



11. At least 4 more or less regular rows of setulose hairs between 



the dorso-central bristles on mesonotum 12 



At most 2 irregular rows of setulose hairs between dorso- 

 centrals on disc of mesonotum 16 



12. Mesonotum with the discal black marking opaque. Food- 



plant unknown. B. C borealis Malloch. 



Mesonotum with the discal mark either reddish or entirely 

 glossy black 13 



13. Cheek posteriorly about half as high as eye; arista almost 



bare. Food-plant unknown. N .M . .flavonigra Coquillett 

 Cheek posteriorly less than half as high as eye; arista pubes- 

 cent 14 



14. No posterior setulae on mid-tibise; posterior margin of meso- - 



notum with a broad, yellow band which is not anteriorly 

 dilated centrally. Larvae mine leaves of walking-leaf 



fern. N. Y.; Ill felti Malloch. 



Each mid-tibia with 2 distinct setulse; posterior margin of 

 mesonotum with a large subquadrate yellow mark in 

 center 15 



15. Mesonotum with discal marks entirely black. Larvae mine 



leaves of Plantago major. U. S.; Canada; 



Europe melampyga Loew. 



Mesonotum with discal mark largely reddish, only posterior 

 extremities and lateral margins black. Larvse mining 

 in Paspalum. S. C; 111 marginalis Malloch*. 



16. Third antennal joint larger than normal in this group, the 



upper margin sharply angulated at apex. Food-plant 



unknown. Ill angidicornis, sp. n. 



Third antennal joint small, rounded at apex. Food-plant 

 unknown. Ill :..... assimilis, sp. n. 



Agromyza deceptiva, sp. n. 



Female. — Glossy black, with reddish ydlow and lemon-yellow 



markings. Occiput, ocellar triangle, and frontal orbits glossy 



black; frontal stripe, antennae, and upper portion of face reddish 



yellow; cheeks yellow, with a narrow, black margin; proboscis 



*Originally described as a variety of melampyga Loew. 



