NOKTII AMERICAN DIPTKRA. 291 



5. Eyes hairy *'• 



Eyes bare '■ 



6. Arista plumose ; abdomen oval or ublong, facial ridjies bare. 



Hyetodei^ia Kdi. 

 Arista pubescent, or nearly bare Tricliopticiis Rdi. 



7. Abdomen with distinct spots 8. 



Abdomen without distinct spots 9- 



8. Arista plumose, or subplumose Spilogasfor Mcq. 



Arista pubescent, or bare I>,iiniiO|>liora R. D. 



9. Arista plumose 10 



Arista pubescent, or bare 11- 



10. Anal vein of wing not reaching the posterior margin jflydica R. D. 



Anal vein prolonged to posterior margin of wing Hydroplioria R. D. 



11. Axillary vein curved toward the apex of the anal vein, which is moderately 



short 12. 



Axillary vein not so curved, anal vein long 13. 



12. Abdomen ovoid and depressed Hoinalomyia Rdi. 



Abdomen narrow, subcylindrical, spotted Azelia R. D 



1.3. Posterior tibite of % bowed, anal vein not reaching margin..Opliyra R. D. 



Posterior tibisB of % straight, or nearly so: face bare, anal vein reaching 



margin, first longitudinal vein* not bristly Antlioiiiyia Mg. s. str. 



14. Arista plumose .....Hylemyia R. D. 



Arista pubescent, or bare lo. 



1.5. Eyes hairy Lasiops Mg. 



Eyes bare, legs black, abdomen of % subcylindrical. ..Chortophila Mcq. 



16. Tegulse large, scales unequal 17, 



Tegulse small, scales equal ; arista pubescent or bare...^iclicenoinyza Hal. 



17. Palpi dilated at extremity L.ispe Latr. 



Palpi not so dilated 18 



18. Arista plumose C'aricea R. D. 



Arista pubescent or bare; abdomen of % clubbed at end, without projet^ting 



appendages, small cross-vein opposite end of first longitudinal vein," 

 front and epistoma not prominent Cceiiosia Mg. s. str. 



References to Genera. 



Hydrot^a R. H., Myod. 509 (1830); Meade, Aunot. list Brit. Anthom. Ent. Mo 



Mag. xviii, 123. 

 Drymeia Meig., Syst. Beschr. v, 204 (1826); Meade, 1. c. xviii, 172. 

 Hyetodesia Rdi., Dipt. Ital. Prod, vi 110 (1877) ; Meade, 1. c. xviii, 2. 

 Trichopticus Rdi., Dipt. Ital. Prod, vi, (1877); Meade, 1. c. xviii, 173. 

 Spilog-aster Mcq., Hi.st. Nat. ii, 293 (1835) ; Meade. 1. c. xviii, 62. 

 Limnophora R. D., Myod. 517 (1830) ; Meade, I. c. xviii, 101. 

 Mydsea R. 1).. Myod. 479 (1830) ; Meade. 1. c. xviii, 27. 

 Hydropboria R. D.. Myod. 503 (1830) ; Meade, 1. c. xviii, 102. 

 Homalomyia Bouche, Naturgesch. Ins. i, 88 (1834) ; Meade, 1. c. xviii, 201. 

 Azelia R. D., Myod. 592 (1830); H. Loew, Ent. Miscel. 1874, 1-41; Meade, 1. e. 



x viii, 221. 



*■ See last paragraph of notes. 



TRANS. AM. ENT. SOC. XIX. DKCKMHEK, 1892. 



