582 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 37. 



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

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

 nobia Lioy, 1864. 



O.sm.ra Desvoidy, Essai INIyod., p. 84, 1830. 1 species. Type, Osmsea grisea Des- 

 voiDY. Equals Actia Desvoidy, 1830. 



Ospriocerus LoEw, Berliner Ent. Zeitschr., vol. 10, p. 29, 1866. 2 species. Type, 

 Z)«.s7/po(/on .Tac((.s Wiedemann {&ii xncides, 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, Ostracoadia mirabilis Giglio-Tos. 



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

 Pyrffota undata Wiedemann (as fuscipennis, new species). Equals Pyrgota Wiede- 

 mann, 1830. 



Oxycera Meigen, Illiger'sMag., vol. 2, p. 265, 1803. 2 species. Type, Musca hypo- 

 leon LiNN/F.us (as trUineata 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. 

 Type, Ozodiceromyia mexicnna Bigot. 



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

 Type, Tarhina goniscformis Meigen. Equals Baumhaueria Meigen, 1838. 



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

 Lauxania seticornis Fallen. 



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

 aier Panzer. Syn., T'f<p;w Latreille, 1805; A/eopac/iygras^er Austen, 1901. 



Pac/M/mma Stephens, Syst. Cat. Brit. Ins., vol. 2, p. 262, 1829. 1 species. Type, 

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



Pachymerina'MACQVART, 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 Linnaeus, 1758. 



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

 Phora venata Aldricii. 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- 

 eronychia Townsend, 1892. 



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

 Tipula crocala Linn.eus, the first species, by designation of Westwood, Intr., vol. 2, 

 Synops., 1840, p. 128. 



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

 Musca lldv'ipennis Fallen (as crussirosiris Meigen). Equals Hylemya Desvoidy, 

 1830. 



Pachystomus 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 fiorea, new species), the first species, by designation of 

 Desvoidy, Hist. Nat. Dipt., vol. 1, 1863, p. 519 (as s^renna Desvoidy). Not Pa7es 

 Meigen, 1800. Equals Neopales, new name. 



Pallasla Desvoidy, Essai Myod. , p. 239, 1830. 1 species (as 2). Type, Mv/eca globosa 

 Fabricius. Ecpials Cistogaster Latreillk, 1829. 



