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

 veins often crowded anteriorly. Antenn:e never with a long or slender 



bristle. 

 I. — First anteniial joint three or four tim:;s as loug as the sejond; sculellum with 



spines Stratiomyia Geof. 



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



2.— Front projecting below, face much retreating, body narrow, abdomen narrower 

 than thi tiiorax, third longitudinal vein not furcate, scutellum with small spines 



(Texas, Mexico) *Myxosargus Brauer. 



Front not projecting below, face convex, ablomen short, broad, scutellum usual- 

 ly with spines; third longitudinal vein usually furcate. . . . Odontomyia Meig. 

 Genera not yet known to occur in the United States: Chordonota 

 Gerst. (Mexico), Neorondania O.S. (Alexico), Cyphomyi.i Wied. (Central 

 America, West Indies), and Nothimyia I^oew. (Cuba). 

 CLITELLARINAE. 

 Abdomen short, usually but little longer than broad; four posterior 

 veins, all of which arise from the discal cell. Small or moderately large 

 species, nearly bare. 

 I. — Scutellum without spines; face produced below into a projecting cone; posterior 



veins of wing weak; small species. •. Nemotelus Geof. 



Scutellum with spines 2 



2. — Antennae short, with a subterminal bristle Oxycera Meig. 



Antennae more or less elongate, without bristle 3 



3. — Scutellum with two spines on its border \ 



Scutellum with six spines. {Scoliopelta). 

 4. — Antenna; much elongated, style not differentiated, eyes bare, smaller species. . . . 



Euparhyphus Gerst. 

 AntenniTi less elongate, style more or less differentiated, eyes pilose, larger 



species Clitellaria Meig. 



Additional N.A. genus: £ur\'fieura Schiner. — Mexico. 



PACHYGASTRINAE. 

 Small species, abdomen oval. Three posterior veins, all arising from 

 the discal cell. 

 I. — Antennae situated near the middle of the face in profile, third joint short, with a 



terminal arista, scutellum without spines Pachj'gaster Gerst. 



Antennce situated low down, near the mouth 2 



2. — Third joint of the antennae forked, the upper branch with an apical bristle 



*Chauna Loew. 



Third joint of the antennre elongate, segmentate, scutellum with spines 



* Acantldna Wied. 

 Additional N.A. genus: Cynipimorpha Brauer, I.e. — Mexico. 



NOTES: 



Suhula, Ghrysonotus and Chauna are all preoccujjied. At least one of these 

 of earlier date {Chauna IHig. ) is now in use, and will necessitate a change. 



The only North American species referred to Chloromyia is Sargus virulis 



