LIST OF DIPTERA. 49 



wings slightly gray ; veins brown ; cross veins clouded ; poisers yel- 

 low, with gray tips. Length of the body 2 lines ; of the wings 5i 

 lines. 



a. St. Martin's Falls, Albany River, Hudson's Bay. Presented by 

 G. Barnston, Esq. 



The first longitudinal vein is more undulating than in the 

 wings of L. punctipennis, and it also differs from that species in 

 having the little vein within the fork of the third longitudinal vein, 

 with the upper branch of its fork much nearer the tip than its lower 

 fork, whereas the reverse of this structure is characteristic of L. 

 punctipennis : the lower branch of the first fork of the fifth longitu- 

 dinal vein is also forked, and a third fork occurs in the upper branch 

 of the second ; and lastly, the short cross vein which connects the 

 two divisions of this third fork in L. carta is wanting in L. puncti- 

 pennis. 



Div. U. Meig. Dipt. pi. 5, /. 8. 



Limnobia immaculata, Meig. Dipt. i. 148, 58. Gim. Bull. Soc. 

 Imp. Nat. Mosc. iv. 344, xv. 642. Limnophila immaculata, 

 Macq. Hist. Nat. Dipt. i. 100, 20. Gim. Bull. Soc. Imp. 

 Nat. Mosc. 1846, iii. 23,13. Tryaphona immaculata, Zett. 

 Ins. Lapp. 852, 1. 



a. England. From Mr. Walker's collection. 



b. Alten, Finmark. From Mr. Walker's collection. 



Limnobia exclusa, n. s. Fulva, thorace fusco trivittato, pedibus 

 fulvis, tarsis fuscis, alis limpidis. 



Body tawny, slender: eyes black: disk of chest with three 

 brown stripes, the middle one broad: legs tawny; shanks darker 

 than the thighs; feet brown: wings colourless; veins brown; 

 brands pale brown ; poisers yellow. Length of the body 3 lines ; of 

 the wings 8 lines. 



a. Alten, Finmark. From Mr. Walker's collection. 



Div. W. Meig. Dipt. i. pi. 65, f. 4. 



Limnobia occulta, Meig. Dipt. yi. 279, 79. 

 a. England. From Mr. Walker's collection. 



