AMERICAN TWO-WINGED FLIES OF THE GENUS 

 STYLOGASTEE MACQUART 



By J. M. Aldrich 



Associate Curator, Division of Insects, United States National Museum 



The present paper contains keys to the species of the genus, a dis- 

 cussion of generic and specific characters and the adult 'habits, and 

 descriptions of all the known species from North and South America, 

 20 in number, of which 12 are new to science. 



Besides the collections of the United States National Museum, 

 important material has been examined from the American Museum 

 of Natural History, the Museum of Comparative Zoology, the Ca- 

 nadian National Collection, and the collections of Prof. A. L. Melan- 

 der and Mr. H. J. Reinhard. Credit is given under the species for 

 the borrowed material. A small but important collection, mostly 

 of South American specimens, which is referred to several times, 

 was purchased a few years ago by the United States National Mu- 

 seum from Dr. O. Krober, of Hamburg. 



Genus STYLOGASTER Macquart 



Stylogaster Macquakt, Hist. Nat. Dipt., vol. 2, 1835, p. 38; Dipt. Exot., 

 vol. 2, pt. 3, 1843, p. 174 (sep. p. 17). — Wllliston, Trans. Conn. Acad. 

 Sci., vol. 6, 1883, p. 91; Kans. Univ. Quart., vol. 1, 1893, p. 120; Manual 

 N. A. Dipt., 1908, p. 263.— RoEDER, Wien. Ent. Zeit., vol. 11, 1892, p. 

 287.— TowNSEND, Ann. and Mag. Nat. Hist., ser. 6, vol. 19, 1897, p. 25.— 

 DeMeijere, Tijdsch. v. Ent., vol. 55, 1912, p. 202.— Krober, Ent. Mitteil., 

 vol. 3, 1914, p. 338 ; Arch. f. Naturgesch., vol. 83, Heft 9, 1919, p. 40. 



Stylomyia Westwood, Proc. Zool. Soc. Lond., vol. IS, 1850, p. 270. 



Ptyclioproctus Bigot, Revue et Magazin de Zoologie, vol. 11, 1859, p. 308. 



The type species is Conops stylata Fabricius, it being the only one 

 mentioned in the original publication of the genus. Macquart in 

 establishing the genus ventured to make a figure of the species, 

 although he had never seen it. Naturally his figure is very mislead- 

 ing, although interesting from a psychological standpoint. The 

 original description of stylata is very brief, after the manner of the 



No. 2852.— Proceedings U. S. National Museum. Vol. 78. Art. 9. 



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