No Kill AmKKIOAN Dll'TlOKA. li> 



2. Abdomen contracted toward tlie base, clavate, pedicellate. 



Macrosargus 



i^bdonien not pedicellate in the male, in the female the second 



segment not concave on the sides. . Sargus 



3. Second antennal joint prolonged on its inner side into a projec- 



tion, extending on. and closely lying upon, the third joint. 



Ptecticus 

 Second joint not with such a projection. .... 4 



4. Males dichoj)tic ; eyes bare Chrysonotus 



Males holoptic ; posterior veins weak. ..... 5 



;'). Ej'es thickly pilose Chloromyia 



Eyes bare, deep metallic species; front very broad in the female ; 

 arista terminal ; abdomen short ; eyes of male with an area of 

 enlarged facets above. .... Microchrysa 



Stratiomyin^;. 



Rather large species, the abdomen usually ovate and more or less 

 thickened. Five posterior cells; often, however, one or more of the 

 three veins that arise from the discal cell is faint or rudimetary, and 

 the cells coalescent: in such cases the discal cell will usually show 

 angulations, indicating their origin. The last posterior vein is nearly 

 always distinct, and arises from the second basal cell. Anterior veins 

 often crowded toward the front. Antennae never with a long or 

 slender bristle. 



1. First antennal joint three or four limes as long as the second; 



scutellum with spines Stratiomyia 



First antennal joint not three times as long as the second. . 2 



2. Face projeetingconically downward; small species. Myxosakgus 



Face not projecting downward in a cone; abdomen not elon- 

 gate. Odontomyia 



Clitellarin.*:. 



Abdomen short, usually but little longer than broad; four poste- 

 rior veins, all of which arise from the discal cell. Small or mod- 

 erately large species, nearly bare. 



1. Scutellum without spines; face produced below into a projecting 

 cone ; posterior veins of wing weak ; small species. 



Nkmotef.us 

 Scutellum with spines 2 



