18 CYRTIDAE OF NORTH AMERICA 



3. Antennae elongate, the tliii'd joint large 7 



Antennae short and inconspicuous 4 



4. Antennae inserted below middle of head in profile 5 



Antennae inserted above middle of head in profile 6 



5. Third joint of antermae with three terminal setae. Wing with costalmar- 



gin enlarged near the tip of the first vein, with a spur in the male. 



Pterodontia 



Third antennal joint with a slender terminal arista. No tooth on the 



costal margin Ogcodes 



6. Venation complete; usually quite thickly pilose species with pilose eyes. 



Opsebius 

 Venation more or less modified, some of the veins obliterated or rudimen- 

 tary. Thinly pilose species with bare eyes Acrocera 



7. Eyes bare Apelleia 



Eyes pilose or pubescent 8 



8. Third antennal joint large and without terminal bristles Ocnaea 



Third antennal joint with terminal bristly hairs Pialeoidea 



9. Large flies with no palpi and usually two ocelli. Proboscis very long. 



Lasia 



Moderately large flies with distinct palpi and three ocelli on a more or less 



prominent tubercle Eulonchus 



The Australian genus Nothra probably does not occur in North 

 America. Dr. Williston in his Manual states the following: 

 "The occurrence of Nothra americana Bigot in North America is 

 doubtful. If, however, Bigot correctly recognized it, the species 

 should be sought for under Oncodes [Ogcodes]." I believe that 

 Bigot had before him a female of Pterodontia misella O. S. when 

 he wrote this description. / 



Philopotinae 



The Philopotinae are not represented in America north of 

 Mexico. There are three species described from Mexico, all in 

 the genus Philopota. (This group is typically South American.) 



PHILOPOTA 



Wiedemann, Aussereurop. zweifl. Ins., ii, p. 17, (1830). 



Erichson, Entomographien, p. 152, (1840). 



Bigot, Ann. Soc. Ent. Fr., ser. 5, viii. Bull. p. Ixxi, (1878), Oligoneura. 



Antennae porrect and approximate, inserted far down on the 

 head, just above the proboscis. The proboscis elongate and 

 carried })ack beneath the body. Eyes contiguous and hairy. 

 Ocelli three. The prothoracic lobes, as in others of the subfamily^ 



