CATALOGUE OF NORTH AMERICAN DIPTERA. 397 



SENOGASTER. 



MACQVART, Hist. Nat. Dipt, i, 519, 1834; Dipt. Exot, u, 2, 72, 1842. 

 BIGOT, Bull. Soc. Ent. France, 1878, 131 (Acrochonlonodcs). 

 WILLISTON, Synop. N. A. Syrph., 238, 1886. 



comstocki WILLISTON, Proc. Amer. Phil. Soc., xx, 326; Synop. N. A. Syrph., 

 239, pi. xi, f. i. N. Y. 



SYRITTA. 



ST. FARGEAU et SERVILLE, Encycl. Meth., x, 808, 1825. 

 MACQUART, Hist. Nat. Dipt., i, 525, 1834. 

 MEIGEN, Syst. Beschr., vn, 113, 1838. 



ZETTERSTEDT, Ins. Lapp., 584, 1838 (Coprina) ; Dipt. Scand., n, 881, 1843. 

 WALKER, Ins. Brit., Dipt., i, 253, 1851. 

 RONDANI, Arch. Zool., in, 9 (Planes). 

 SCHINER, Fauna Austr., i, 357, 1862. 

 WILLISTON, Synop. N. A. Syrph., 239, 1886. 

 VERRALL, Brit. Flies, vm, 611, 1901. 

 CHAGNON, fit. Prelim, les Syrph.. 61, 1901. 

 pipiens LINNE, Syst. Nat., loth ed., 594 (Mitsca); Fauna Suec., 2d ed., 450 



(.id.). Europe. 



DEGEER, Ins., vi, 120. pi. vii, f. 8, 9 (id.). 

 SCOPOLI, Ent. Carniol., No. 969 (Conops). 

 FABRICIUS, Spec. Ins., n, 434 (Syrphus) ; Ent. Syst., iv, 310 (id.) ; Syst. 



And., 194 (Milcsia). Europe. 

 LATREILLE, Consid. Gener., 443 (id.). 

 FALLEN, Syrphici, 12 (id.). 



MEIGEN, Syst. Beschr., in, 213 (Xylota) ; vn, 113, pi. LXVII, f. 21. 

 SAY, Amer. Ent., i, 16, pi. vin, f. 3 (Xylota proximo.) ; Compl. Works, 



i, 16 (id.). Phil., Va. 

 WIEDEMANN, Auss. Zweifl., ii, 102 (id.). 



ZETTERSTEDT, Ins. Lapp., 584 (Coprina) ; Dipt. Scand., n, 881 ; xii, 4675. 

 SCHINER, Verh. Zool.-Bot. Ges., vn, 424; Fauna Austr., i, 358. 

 WILLISTON, Synop. N. A. Syrph., 240. U. S. ; common everywhere. 

 HOWARD, Proc. Wash. Acad. Sci., 11, 597, notes; said to have been reared 



from horse and cow dung. 

 VERRALL, Brit. Flies, vin, 612, figs. 

 CHAGNON, fit. Prelim, les Syrph., 61. Montreal. 



" Everywhere and at all times abundant from spring to autumn " Will. 

 vagans WIEDEMANN, Auss. Zweifl., 11, 101. Brazil. 

 RONDANI, Archiv. Zool., in, 9 (Planes). 

 SCHINER, Novara, 367 (americana). S. A. 

 BIGOT, Annales, 1883, 539 (mcxicana). Mex. 

 WILLISTON, Trans. Amer. Ent. Soc., xv, 285 (americana) ; Biologia, Dipt., 



in, 73. Brazil; Vera Cruz and Costa Rica. 



XYLOTA. 



MEIGEN, Syst. Beschr., in, 211, 1822. 



SCHINER, Fauna Austr., i, 354, 1862. 



WILLISTON, Synop. N. A. Syrph., 224, 1886, clef, and table of species; 



Biologia, Dipt., in, 71, 1891, table of Central Amer. species. 

 VERRALL, Brit. Flies, vin, 596, 1901. 

 CHAGNON, fit. Prelim, les Syrph., 62, 1901. 

 aepalius WALKER, see Brachypalpus sorosis. 



