THE CANADIAN ENTOMOLOGIST. 77 



NEW OR LITTLE KNOWN GENERA OF NORTH AMERICAN 



SYRPHIDy^:. 



BY DR. S. W. WILLISTON, NEW HAVEN, CONN. 



In the preparation of a synopsis of the North American genera of 

 Syrphidae, I have found several new species that could not be placed in 

 any of our known genera. A careful study of the figures and descriptions 

 of exotic forms has not thrown much light upon them, and I am therefore 

 constrained to regard them as new. 



With the genera included in the present paper, and resuscitating 

 Macquart's Toximierus, the number now recorded from North America 

 will reach sixty, all but five or six of which are in the writer's collec- 

 tion. Of these, but nine or ten have not yet been found east of the 

 Central Plains, and the following, only, that are not now known west of 

 that region, viz., Triglyphus, Senogaster, Pyrophaefia, Doros, Ocyptamus, 

 Rhingia, Brachypalpus, Somiila, Temnostoma, Merapioidus, Pterallastis, 

 Teuchocnemis and Lepidomyia^ leaving nearly forty genera that occur 

 entirely across the continent ; indeed a large proportion of the species are 

 identical from the Atlantic and Pacific regions. 



Merapioidus villosus Bigot, Bui. Soc. Ent. France, 1879, No. 6, p. 64. 

 An aberrant and well marked genus, easily recognized by the peculiar 

 structure of the antennae, the third joint of which is extended on its upper 

 anterior part into an elongate cone, slightly bent forward and terminating 

 in the thickened arista. The arista is really subterminal, showing the 

 development of such genera as Callicera and Ceria. Body short, oval, 

 abdomen with interrupted metallic fasciae. Its relationship is remote from 

 Milesia in Schiner's acceptation (Sphixea Rond,, Bigot.) viz., with the 

 closed sub-marginal cell. It may be placed in the neighborhood of 

 Criorhina, Chrysochlamys, or the following : 



Brachymyia gen. nov. Head short, broad, antennal prominence well 

 developed in the male, conic, less so in the female. First joint of antennae 

 longer than the second, third broader than long, transversely oval. Face 

 much produced downward and forward, conical, pointed, tuberculate, 

 cheeks broad. Front short, eyes bare, separated in the male by the tumid 

 ocelligerous tubercle. Body with long pile, abdomen short, broad, arched, 

 without markings. Legs all slender, simple. Third longitudinal vein 

 nearly straight; small cross vein very oblique, near outer third of discal cell. 



Brachymyia lupina, sp. nov., ^ % . Face on the sides covered with 



