i 



552 PROCEEDINGS QF THE NATIONAL MUSEUM. vol.37. 



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



Heterostylum flavum Macquart. Syn., Comastes Osten Sacken, 1877. 

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



chalybeata Forster (as Stratiomys sexdentata Fabricius), the second species, by 



tautonomy. Equals Beris Latreille, 1802. 

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



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

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



Type, Gordilura loxocerata Fallen. 

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



Hexatoma nigra Latreille. Syn., Nematocera Meigen, 1818; .4rasomera Wiedemann, 



1818. 

 u Hiatus Cresson, Trans. Amer. Ent. Soc, vol. 32, p. 280, 1906. 1 species. Type, 



Hiatus fulvipes Cresson. 

 w 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 hilarella Zetterstedt. Syn., Eumacronycha Townsend, 1892; Gymnoprosopa 

 Townsend, 1892. 



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

 Type, Hilarimorpha singularis Schiner. 



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

 Himantostoma. sugens Loew. Not Himantostoma Agassiz, 1862. 



"' Himera Bebvoidy, Hist. Nat. Dipt., vol. 1, p. 1124, 1863. 1 species (as 4). Type, 



Guerinia festiva Desvoidy. Equals Exorista Meigen, 1803. 

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



Himerassa pretiosa Loew. 

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



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



Williston, 1896. 

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



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



General. , 1810, p. 444. Syn., Nirmomyia Nrrzscn, 1818. 

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



Hxrtnoneura obscura Wiedemann. Syn., Parasymmictus Bigot, 1879. 



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

 Type, Sargus inermis Wiedemann. 



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

 cephala Macquart, 1838, not of Laporte, 1832. Type, Dasypogon ab'dominalis Say. 

 Syn., JDiscocephala 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 (as pulchra, new species). Equals Dionnsea 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. 

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

 Holorusia grandis Bergroth (as rubiginosa, new species, preoccupied). 



