NORTH AMERICAN DIPTERA. 323 



Species described by Walker. 



Microdon bicolor Walker, Trans. Entom. Soc. Loud, iv, 151 [Ceratophyia). — Para, 

 flavitibia Walker, Dipt. Sauuder.s, 217, pi. v, fig. 2 {Ubristes). — Brazil, 

 luridescens Walker, Traus. Entom. Soc. Loud, iv, 151 (Ceratophym). — 

 Amazon. 

 Paragus maculatus Walker, Dipt. Saunders, i, 220. — Brazil. 



scutellatus Walker, Linn. Traus. xvii, 242, 29. — Brazil. [The clu))bed 

 and banded abdomen renders the location here impos- 

 sible ; possibly it is a 3Iixogaster.] 

 Pipiza costalis Walker, Linn. Trans, xvii, 342, 31. 



dolosa Walker, Trans. Eutom. Soc. Loud, iv, 156. — Amazon, 

 longicornis Walker, Liun. Trans, xvii, 343, 32. 

 pica Walker, Trans. Entom. Soc. Loud, iv, 156. — Amazon, 

 sericea Walker, Linn. Trans, xvii, 343. 33. 

 Rhoga lutescens Walker, Trans. Entom. Soc. Loud, iv, 157. — Para. [The genus 

 Rhoga, here characterized, is placed by the author near 

 Paragiis.] 

 Syrphus basilaris Walker, Linn. Trans, xvii, .345, 37. ["5mm. Abdomen seneo- 

 fuscum."] 

 Caldus Walker, Dipt. Saunders, i, 232. — Brazil. 

 Barbula Walker, Dipt. Saunders, i, 238. — Brazil, 

 iridipennis Walker, Linn. Trans, xvii, 245, 38. ["7 mm. S. ohscuro 



similis." Melanostoma f] 

 Laenas Walker, Dipt. Saunders, 241. — Brazil. 

 Portius Walker, Dipt. Saunders, i, 239. — Brazil, 

 octomaculatus Walker, Linn. Trans, xvii, 344, 34. — Brazil. 

 S.tolo Walker, Dii)t. Saanders, i, 241.— Brazil. 



subchalybeus Walker, Trans. Entom. Soc. Lond. iv, 150. — Amazon, 

 tarsalis Walker, Linn. Trans, xvii, 345, 39. [Oc)/2^tam.us ?] 

 unicolor Walker, Linn. Trans, xvii, 344, 36. — Straits of Magellan. ["4 

 mm. Chnlyheo ater, pedibns rufis, nigra variegatus, alis h.y- 

 alinis." Evidently no Syrphus.] 

 Vatia Walker. Dipt. Saunders, i, 240. — Brazil. 

 Baccha crassa Walker, Dipt. Saunders, i, 222. — Brazil. 



inornata Walker, Linn. Trans, xvii, 342, 30. — Brazil, 

 oblonga Walker, Dipt. Saunders, i, 221. — Brazil, 

 tenuis ^^'alker, Dijit. Saunders, i, 222. — Brazil. 

 Salpingogaster costalis Walker, Dipt. Saunders, 223 (Amafliia). — Brazil. [For 

 the synonymy of Amathia, compare Schiner, Novara 

 Exped. .344.] 

 Ascia Anthermus Walker, List, etc., iii, 547. — Para. [Not an Ascia ; Baccha f] 



striata Walker, Dipt. Saunders, i, 242. — Brazil. 

 Temnocera circumdata Walker, Trans. Eut. Soc. Lond. iv, 154. — Amazon. 

 Integra Walker, Trans. Eut. Soc. Lond. iv, 155. — Amazon, 

 trifascia Walker, Trans. Ent. Soc. Lond. iv, 154. — Para. 

 Eristalis lateralis Walker, Linn. Trans, xvii, 347; List, etc., iii, 622. — Chili, 

 Guiana, Mexico, Jamaica. 



