552 PROCEEDINGS OF THE NATIONAL MFSEVM. vol.37. 



Heterostylum Macquart, Dipt. Exot., Suppl. 3, p. 35, 1848. 1 species. Type, 

 Ileterostylum flaviim MACtiUART. Syn., Comastes Osten Sacken, 1877. 



Hexacantha Meicen, Illiger's Mag., vol. 2, p. 264, 1803. 2 species. Type, Musca 

 cJudi/beatd Forster (as Stratiomys scxdcntata Fabricius), the second species, by 

 tautonomy. Equals Beris Latreille, 1802. 



Hexachaeta Loew, Monogr. Dipt. N. Anier., vol. 3, p. 219, 1873. 3 species. Type, 

 Trypeta exiinia Wiedemann, the first species, by present designation. 



Hexamitocera Becker, Berliner Ent. Zeitschr., vol. 39, p. 107, 1894. 1 species. 

 Type, Curdilnra loxocerata Fallen. 



Hexatoma Latreille, Gen. Crust, et Ins., vol. 4, p. 260, 1809. 1 species. Type, 

 Ilexatoma nl(jni Latreille. Syn., Nematocera Meigen,1818; ^mso7«ent Wiedemann, 

 1818. 



Hiatus Cresson, Trans. Amer. Ent. Soc, vol. 32, j). 280, 1906. 1 species. Type, 

 Hiatus fulvipes Cresson. 



Hilara Meigen, Syst. Beschr. Zweifl. Ins., vol. 3, p. 1, 1822. 21 species. Type, 

 Empis maura Fabricius, the second species, by designation of Curtis, Brit. Ent., 

 1826, p. 130. 



Hilarella Rondani, Dipt. Ital. Prodr., vol. l,p. 70, 1856. 1 species. Type, Milto- 

 gramma hilardla Zetterstedt. Syn., Euniacronycha Townsend, 1892; Gymnoprosopa 

 Townsend, 1892. 



Hilarimorpha Schiner, Wien. Ent. Monatschr., vol. 4, p. 54, 1860. 1 species. 

 Type, Hilarimorpha singidaris Schiner. 



Himantostoma Loew, Berliner Ent. Zeitschr,, vol. 7, p. 321, 1863. 1 species. Type, 

 Hirnantostoma sugens Loew. Not Himantostoma Agassiz, 1862. 



i/tTOera Desvoidy, Hist. Nat. Dipt., vol. 1, p. 1124, 1863. 1 species (as 4). Type, 

 Guerinia festiva Desvoidy. Equals Exorista Meigen, 1803. 



Himeroessa Loew, Monogr. Dipt. N. Amer.,vol. 3, p. 85, 1873. 1 species. Type, 

 Himerassa j'i'eliosa Loew. 



Hippelates Loew, Berliner Ent. Zeitschr., vol. 7, p. 36, 1863. 2 species. Type, 

 Hippelates pjlebcjus Loew, the second species, by present designation. Syn., Siphomyia 

 W^illiston, 1896. 



Hippobosca Linnaeus, Syst. Nat., 10th ed.,p. 607, 1758. 4 species. Type, Hippo- 

 bosca equina Linnaeus, the first species, by designation of Latreille, Consider. 

 G6n6ra,\., 1810, p. 444. Syn., Nirmomyia Nitzsch, 1818. 



Hirmoneura Meigen, Syst. Beschr. Zweifl. Ins., vol. 2, p. 132, 1820. 1 species. Type, 

 Hirmonenra o/;.se((ro Wiedemann. Syn., Parasymmictus Bigot, 1879. 



Histiodroma Schiner, Verb. Zool.-Bot. Ges. Wien, vol. 17, p. 308, 1867. 1 species. 

 Type, Sargus inermis Wiedemann. 



Holcocephala J.ennicke, Neue Exot. Dipt., p. 51, 1867. Change of name for Disco- 

 cephala Macquart, 1838, not of Laporte, 1832. Type, Dasypogon (tbdoinlnalis Say. 

 Syn., Discocephala Macquart, 1838, preoccupied. 



Holmbergia Arribalzaga, An. Soc. Cient. Argentina, vol. 32, p. 196, Oct., 1891. 

 1 species. Type, Holmbergia guntherii Arribalzaga. Equals Rhopalosyrphus 

 GiGLio-Tos, Sept. 20, 1891. 



Holodera Schiner, Wien. Ent. Monatschr, vol. 4, p. 53, 1860. 1 species. Type, 

 Rhamphomyia umbripennis Meigen (aii jmldira, new species). Equals Dionnaea Mei- 

 gen, 1800. 



Holoneura KiEFFER, Ann. Soc. Ent. France for 1894, p. 312, 1894. 1 species. Type, 

 Holoneura cincta Kieffer. 



Holopogon Loew, Linn. Ent., vol. 2, p. 473, 1847. 7 species. Type, Dasypogon 

 nigripennis Meigen, the third species, by present designation. 



Holorusia Loew, Berliner Ent. Zeitschr., vol. 7, p. 277, 1863. 1 species. Type, 

 Holorusia grundis Bergroth (as ruhiginosa, new species, preoccupied). 



