39^ CATALOGUE OF NORTH AMERICAN DIPTERA. 



MERODON. 



MEIGEN, Illig. Mag., u, 274, 1803; Syst. Beschr., in, 349, 1822. 

 SCHINER, Fauna Austr., i, 343, 1862. 

 VERRALL, Brit. Flies, vm, 555, 1901. 

 equestris FABRICIUS, Ent. Syst., iv, 292 (Syrphus cquestris and flavicans) ; Syst. 



Antl., 196, 239, 240 (Mcrodon cquestris, Eristalis narcissi and ferru- 



gineus'). Europe; larvae in bulbs of Narcissus, etc. 

 MEIGEN, Syst. Beschr., in, 352-354 (cqitcstris, transversalis, constant, and 



nobilis}. 



RONDANI, Nuovi aim. di Bologna, n, 4, 254 (tuberculatus and bulborum). 

 SCHINER, Fauna Austr., i, 344. 

 OSTEN SACKEN, Cat., 135, note on occasional importation of larvae in 



bulbs from Europe. 

 VERRALL, Brit. Flies, vm, 556, figs. 

 Montreal Johnson in litt. 



TRIODONTA. 



WILLISTON, Bull. Brooklyn Ent. Soc., vn, 136, 1885; Synop. N. A. Syrph., 



205, 1886. 



MACQUART, Dipt. Exot., Suppl. iv, 144, 1850 (Polydonta, preoc.). 

 curvipes WIEDEMANN, Auss. Zweifl., n, 149 (Mcrodon). N. A. 



MACQUART, Dipt. Exot., Suppl. i, 132, pi. u, f. 7 (Helophilus albiceps), 



female; Suppl. iv, 144, pi. xni, f. 6 (Polydonta bicolor), male. Both 



Nova Scotia. 



WALKER, List, in, 599 (Mcrodon inorosus). Nova Scotia. 

 OSTEN SACKEN, West. Dipt., 338, notes (Polydonta} ; Cat., 135, syn. 

 WILLISTON, Synop. N. A. Syrph., 206, pi. ix, f. i. New Eng., Cal., Col. 

 N. J. Smith Cat.; Sea Cliff, L. I. Banks. 



TEUCHOCNEMIS. 



OSTEN SACKEN, Bull. Buff. Soc. Nat. Sci., in, 58, 1876; Cat., 250, 1878, 

 desc. quoted. 



WILLISTON, Synop. N. A. Syrph., 199, 1886. 



CHAGNON, fit. Prelim, les Syrph., 54, 1901. 

 bacuntius WALKER, List, in, 563 (Milesia). Ga. 



OSTEN SACKEN, Bull. Buff. Soc. Nat. Sci., in, 58; Cat., 250. notes on 

 genus. 



WILLISTON, Synop. N. A. Syrph., 200, pi. vii, f. 6. Ga., Tex. 



N. J. Smith Cat. 

 lituratus LOEW, Cent., iv. Si (Ptcrallastes). Pa. 



OSTEN SACKEN, Bull. Buff. Soc. Nat. Sci., in, 58; Cat., 250. notes. 



WILLISTON, Synop. N. A. Syrph., 200, pi. vm, f. 12. Pa., Conn., Mo. 



CHAGNON, fit. Prelim, les Syrph., 54. Rigaud, Quebec. 



PTERALLASTES. 



LOEW, Cent., iv, 80, 1863. 



WILLISTON, Synop. N. A. Syrph., 198, 1886. 

 perfidiosus HUNTER, Canad. Ent., xxix, 139, fig. Br. Col. 

 thoracicus LOKXV, Cent., iv, 80. Pa. 



W T ILLISTON, Synop. N. A. Syrph., 198, pi. vm, f. 9. Pa. 



N. J. Smith Cat.; Sea Cliff, L. I. Banks. 



