1. Posterior angle of anal cell drawn out into a long lobe; posterior 



cross-vein very oblique. ....... 2 



Posterior angle of anal cell not greatly produced. ... 3 



2. Wings proportionately narrow, of equal width; round at tip (11) . 



Pterocalla. 

 Wings with much curved hind margin. . . Callopistria. 



3. Anterior and posterior cross-veins very oblique. ... 5 

 Posterior cross-vein rectangular or nearly so. .... 5 



4. Scutellum with two bristles. .... Xanthachrona. 

 Scutellum with four bristles. ..... Myennis. 



5. Second longitudinal vein straight or nearly so; anterior cross-vein 



not oblique. ......... 6 



Second longitudinal vein markedly sinuous ; cross-veins approxi- 

 mated and the anterior one very oblique. Paragorgopis.* 



6. Cheeks rather broad; posterior angle of anal cell acute (7). 



Pseudotephritis. 



Cheeks and face extremely short; eyes transversely oval; posterior 

 angle of anal cell rectangular. . . . Psairoptera. 



UI^IDIIN^S. 



Head large, hemispherical, proboscis stout, with broad labella; front 

 broad; antennae usually short; mesonotum bristlv in the middle behind 

 only; first and third longitudinal veins of the wing bare; posterior an- 

 gle of the anal cell acute, sometimes drawn out into a long lobe. 



1. Head conspicuously large; antennae widely separated at base; 



cheeks and face swollen. ....... 2 



Head not conspicuously large; antennae not unusually remote at 



I ''i"* 1 ' . ).& 



2. Eyes round, about one-half the height of head. ... 3 

 Eyes higher than long Parcedopa.f 



3. Third joint of antennae rounded; front not rugose above (8). 



Oedopa. 

 Third joint of antennae elongate; front rugose above. Eurycephala 



4. Antennae long; third joint unusually long. . Stictomyia.t 

 Antennae shorter, the joint more or less oval. ... 5 



* This genus is located here as definitely as the characters given will 

 permit. 



t These genera are inserted after Cresson, 1906, 7. 



