LIST OF DIPTERA. 543 



Chrysotoxum erraticum, n. s., fern. Nigrum, fulvo hirtum, anten- 

 nis nigris basi fulvis, pedibus fulvis,alis limpidis ad costam sub- 



Body black, thickly clothed with short tawny hairs : head as 

 broad as the chest : eyes dark red, very downy ; facets very small, 

 of equal size : mouth and feelers black ; first joint of the latter 

 tawny, with a black tip : abdomen oval, very little broader and 

 longer than the chest : legs tawny ; thighs clothed with yellow 

 hairs : wings colourless, slightly tawny along the fore borders ; 

 wing-ribs, veins and poisers tawny. Length of the body 4^ lines ; 

 of the wings 11 lines. 



Psarus, Latreille. 

 Group I. 



Psarus abdominalis, Fabr. Syst. Antl. 211, 1. Latr. Gen. Crust. 

 iv. 326. Cons. Gen. 443. Meig. Dipt. iii. 174, 1, pi. 27, /. 12. 

 Macq. Hist. Nat. Dipt. i. 490, 1. Musca, &c, Geoff. Ins. ii. 

 519, 50. Syrphus abdominalis, Fabr. Ent. Syst. iv. 307, 108. 

 Ceria abdominalis, Fabr. Ent. Syst. Suppl. 557, 2. 



a. England. 



b. France. 



Group II. Mixtemyia, Macquart. 



Psarus quadrifasciatus, Wied. Auss. Ztveif. ii. 91, 2. Paragus 

 quadrifasciatus, Say, Longs Exped. ii. Append. 377. Mix- 

 temyia quadrifasciata, Macq. Hist. Nat. Dipt. i. 491, 1. pi. 11, 

 /.8. 



a. United States. Presented by the Entomological Club. 



Paragus, Latreille. 



Paragus bicolor, Latr. Gen. Crust, iv. 326. Cons. Gen. 443. Meig. 



Dipt. iii. 178, 2. Macq. Hist. Nat. Dipt. i. 565, 2, pi. 12, /. 



17. Musca melanochrysa, Gmel. Ed. Syst. Nat. v. 2879, 374. 



Musca, &c, Geoff. Ins. ii. 520, 51. Mulio bicolor, Fabr. 



Suppl. 559,8. Syst. Antl. 1 86, 10. Syrphus bicolor, Fabr. 



Ent. Syst iv. 297, 71. 

 a. England. 



