60 DITTERI DEL MESSICO 



delle specie di Syrphidae del Messico non menzionate in questo lavoro. 



Ceria cacica Walkee, Trans. Ent. Soc. Lond., new ser., V, p. 288. 



— nigra Bigot, Ann. Soc. Ent. Fr., 1883, p. 317 (Sphyximorpha). 



— rufibasis Bigot, ibid. p. 318 (Sphyximorpha). 



— nigripennis Williston, N. Amer. Syrphidae, 1886, p. 263. 



— superba Williston, ibid., p. 264. 



— pedicellata Williston, ibid., p. 264. 



— scutellata Williston, ibid., p. 265. 



— Meadei Williston, Biol. Centr. Amer., IH, p. 76, 5. 



— Schnablei Williston, ibid., lU, p. 76, 7. 



— Bergrothi Williston, ibid.. Ili, p. 77, 10. 



Mixogaster mexicana Macquabt, Dipt. exot., 1"'' suppl., p. 123, 2, tab. X, fig. 15. 



— bellula Williston, Biol. Centr. Amer., DI, p. 1, 2, tab. I, fig. 1, la, Ib. 

 Microdon gracilis Bigot, Ann. Soc. Ent. Fr., 1883, p. 321. 



— n. sp. Williston, N. Amer. Syrph., p. 8. 



— aurifex Wiedemann, Auss. Zweifl. Ins., Il, p. 85; Williston, ibid., p. 9 = ? <ro- 



chìlus Walkee, Dipt. Saund., p. 216. 



— baliopterus Loew, Cent. X, n. 56; Williston, Biol. Centr. Amer., lU, p. 3, 3. 



— niger Williston, ibid., p. 4, 7. 

 Chrysotoxiim — ? Williston, ibid., p. 5, 2. 



— — ? Williston, ibid., p. 5, 3. 



Paragus dimidiatus Loew, Cent. IV, n. 63; Williston, ibid., p. 5, 1. 



Nausigaster punctulata Williston, N. Amer. Syrph., p. 21, pi. I, fig. 10, lOa; Biol. 



Centr. Amer., Ili, p. 6, 1. 

 Pipiza divisa Walkee, Trans. Ent. Soc. Lond., n. ser., IV, p. 156. 



— (Heringia) — ? Williston, Biol. Centr. Amer., DI, p. 6, 1. 



— (Pipizella) bellula Williston, ibid., p. 6, 2. 

 Lepidomyia cincia Bigot, Ann. Soc. Ent. Fr., 1883, p. 345. 



Chrysogaster nitida Wiedemann, Auss. zweif. Ins., Il, p. 116; Williston, ibid., p. 7, 1 

 (vedi sinonimia). 



— bellula Williston, ibid., p. 7, 2. 



Chilosia chrysochlamys Williston, ibid., p 8, 1. 



— sororia Williston, ibid., p. 8, 2. 



— sororcula Williston, ibid., p. 9, 3. 



— frontosa Bigot, Ann. Soc. Ent. Fr., 1883, p. 554 (Cartosyrphus). 



