582 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



Oscinisoma Lioy, Atti Inst. Veneto, ser. 3, vol. 9, p. 1125, 1864. 2 species. Type, 

 Chlorops ritripennis Meigen, the first species, by present designation. Equals Bota- 

 nobia Lioy, 1864. 



Osmira Desvoidy, Essai Myod., p. 84, 1830. 1 species. Type, Osvisea grisea Des- 

 voiDY. Equals Actia Desvoidy, 1830. 



Ospriocerus LoEw, Berliner Ent. Zeitsclir., vol. 10, p. 29, 1866. 2 species. Tj'pe, 

 Da-sypogron .racMs Wiedemann (as asacides, new species), the first species, by designa- 

 tion of Back, Trans. Amer. Ent. Soc, vol. 35, p. 184, 1909. 



Ostracoccelia Giglio-Tos, Boll. Mus. Zool. Univ. Torino, vol. 8, no. 158, p. 10, 

 1893. 1 species. Type, Ostracocuiia mirabilis Giglio-Tos. 



Oxycephala Macquart, Dipt. Exot., vol. 2, pt. 3, p. 197, 1843. 1 species. Type, 

 Pyrgota undata Wiedemann [as fw^cipennis, new species). Equals PjTgota Wiede- 

 mann, 1830. 



Oxycera Meigen, Illiger's Mag., vol. 2, p. 265, 1803. 2 species. Type, Musca kypo- 

 leon LiNN^^us (as trilineata Fabricius), the second species, by designation of Curtis, 

 Brit. Ent., 1833, p. 441. Equals Hermione Meigen, 1800. 



Oxyrhina Meigen, Syst. Beschr. Zweifl. Ins., vol. 7, p. 366, 1838. Change of name 

 for Trigonometopus Macquart, 1835, on the false ground that this name is not appro- 

 priate. Type, Tetanocera frontalis Meigen. Equals Trigonometopus Macquart, 

 1835. 



Ozodiceromyia Bigot, Ann. Soc. Ent. France for 1889, p. 321, 1889. 1 species. 

 Tyr>e, Ozodiceromiiia mexlcana Bigot. 



Pachycephala Lioy, Atti Inst. Veneto, ser. 3, vol. 9, p. 1343, 1864. 1 species. 

 Type, Tarhina gonixforinis Meigen. Equals Baumhaueria INIeigen, 1838. 



Pachycerina Macquart, Hist. Nat., Dipt., vol. 2, p. 511, 1835. 1 species. Type, 

 Lauxania srticornis Fallen. 



Pachygaster Meigen, Illiger's Mag., vol. 2, p. 266, 1803. 1 species. Type, Nemotelus 

 a<e?' Panzer. Syn., F«py-»o Latreille, 1805; NenpacJiygaster AvsTE^t, 1901. 



Pachymer hi Stephet^is, Syst. Cat. Brit. Ins., vol. 2, p. 262, 1829. 1 species. Type, 

 Empis femorata Fabricius (as ruralis Meigen). Equals Empis Linn.eus, 1758. 



Pac/»/;»er ma Macquart, Hist. Nat., Dipt., vol. 1, p. 333, 1834. 4 species. Type, 

 Empis femorata Fabricius, the first species, by designation of Coquillett, Proc. Ent. 

 Soc. Washington, vol. 5, 1903, p. 254. Equals Empis Linnj^ais, 1758. 



Pachyneurella Brues, Trans. Amer. Ent. Soc, vol. 29, p. 382, 1903. 1 species. Type, 

 Phora venata Aldrich. Equals Puliciphora Dahl, 1897. 



Pachyophthalmus Brauer and Bergenstamm, Denkschr. Kais. Akad. Wiss. Wien, 

 vol. 56, p. 117, 1889. 1 species. Type, Tachina signata Meigen. Syn., Sarcoma- 

 crovychia Townsend, 1892. 



Pachyrhina Macquart, Hist. Nat., Dipt., vol. 1, p. 88, 1834. 8 species. Type, 

 Tipnhi crocnla Linn.eus, the first species, by designation of Westwood, Intr., vol. 2, 

 Synops., 1840, p. 128. 



Pachystoma Lioy, Atti Inst. Veneto, ser. 3, vol. 9, p. 910, 1864. 1 species. Type, 

 Musca flavipennis Fallen (as crassirostris Meigen). Equals Hylemya Desvoidy, 

 1830. 



PacJiystornns Latreille, Gen. Crust. Ins., vol. 4, p. 286, 1809. 1 species. Type, 

 Nemotelus cinctus De Geer (as Rhagio syrphoides Panzer). Equals Erinna Meigen, 

 1800. 



Pales Desvoidy, Essai Myod., p. 154, 1830. 2 species (as 6). Type, Tachina proces- 

 sioned Ratzebirg (as florea, new species), the first species, by designation of 

 Desvoidy, Hist. Nat. Dipt., vol. 1, 1863, p. 519 (as s/rerwa Desvoidy). "Not Pales 

 Meigen, 1800. Equals Neopales, new name. 



PaUasia DEsvoim', Essai Myod. , p. 239, 1830. 1 species (as 2). Type, Musca globosa 

 Fabricius. Equals Cistogaster Latreille, 1829. 



