LIST OF DIPTERA. 651 



Psilopus albicoxa, MSS., mas. et fern. Cyaneo- aut cupreo-viridis, 

 antennis nigris capite duplo longioribus, pedibus jflavis, tarsis 

 posticis nigris, alis subcinereis. 



Head and chest armed with black bristles : head bluish green, 

 covered in front with white down, clothed beneath with white hairs : 

 eyes red : mouth tawny: feelers black, about twice the length of the 

 head : palpi black : chest of the male bluish green, sometimes 

 black towards the tip, of the female bright green or coppery green ; 

 sutures of the segments sometimes black : breast and underside of 

 the abdomen covered with white down : legs yellow, adorned with 

 rows of minute spines, clothed with a few white hairs, and beset 

 with a few black bristles ; four hinder hips green ; tips of feet black ; 

 hind feet black ; first joint brownish : wings slightly gray ; wing- 

 ribs tawny ; veins black ; poisers yellow. Length of the body 1 J 

 line ; of the wings 2\ lines. 



a. North America. Presented by the Entomological Club. 



b. Ohio. Presented by the Entomological Club. 



c. Massachusetts. From Prof. Sheppard's collection. 



d. Nova Scotia. From Lieut. Redman's collection. 



Chrysotus, Meigen. 



Chrysotus neglectus, Meig. Dipt. iv. 41, 1, pi, 35, /. 10. Macq. 



Dipt. Nord. 19, 1. Hist. Nat. Dipt. i. 446,1, pi. 10,/. 21. 



Zett. Ins. Lapp. 795, 1. Dolichopus neglectus, Wied. Zool. 



Mag. i. 74, 22. D. viridulus, Fall. Dolich. 18, 23. 

 a. England. Presented by F. Walker, Esq. 



Chrysotus copiosus, Meig. Dipt. iv. 41, 2. Macq. Hist. Nat. 



Dipt. i. 446, 2. 

 a. England. Presented by F. Walker, Esq. 



Chrysotus cilipes, Meig. Dipt. iv. 41, 3. 

 a. England. 



Chrysotus femoralis, Megerle, Meig. Dipt. iv. 42, 5. Macq. Hist. 



Nat. Dipt. i. 446, 3. 

 a. England. Presented by F. Walker, Esq. 



Chrysotus incertus, n. s. Viridis, antennis nigris, femoribus 

 viridibus, tibiis fulvis, apice tarsisque obscurioribus, alis lim- 

 pidis. 



Allied to C. femoralis. Body green, beset with black hairs and 

 bristles : eyes red : mouth and feelers black : hips and thighs 



