LIST OF DIPTEEA. 



junction with the lower cross-vein; the latter is upright, nearly 

 straight, parted by nearly thrice its length from the middle cross-vein, 

 by more than lour times its length from the end of the fourth longi- 

 tudinal vein, and by its length from the end of the fifth longitudinal 

 vein ; poisers pale yellow. Length of the body 1^ line ; of the 

 wings 3 lines. 



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

 G. Barnston, Esq. 



Diastata ? albicosta, n. s., mas. Picea, gracilis, capite subtus palpis 

 pedib usque Jl avis, antennis nigris, alis fuscis angustis ad costam 

 albis margine postico subcinereis. 



Body pitchy, linear, very narrow : head and chest beset with a 

 few black bristles : head beneath, sucker and palpi yellow : eyes 

 pitchy : feelers black, shorter than the face ; third joint short ; 

 bristle slender, stout at the base, leathered to the tip with very short 

 hairs, more than thrice the length of the third joint: abdomen much 

 longer than the chest: legs yellow, slender: wings long, narrow, 

 dark brown, white along the fore border till near the tip, grayish 

 along the hind border: wing-ribs and veins pitchy; longitudinal 

 veins straight ; second vein waving along the whole length at first 

 upward, then downward ; fifth vein inclined to the hind border after 

 its junction with the lower cross-vein where it does not from an 

 angle; lower cross-vein slightly oblique, a little curved outward, 

 parted by more than twice its length fr<>ni the middle cross-vein, by 

 eight times its length from the end of the fourth longitudinal vein, 

 and by nearly twice its length from the end of the fifth longitudinal 

 vein ; poisers yellow. Length of the body 1 line ; of the wings 2| 

 lines. 



a. ? Presented by the Entomological Club. 



Group 2. Camilla, Holiday, Ann. Nat. Hist. ii. 188. 



Diastata glabra, Hal. Ann. Nat. Hist. ii. 188. Drosophila glabra, 

 Fall. Geom. 8, 12. Meig. Dipt. vi. 85, 10. Diastata serata, 

 Haliday, Curtis, Guide, App. 281. 



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



Opomyza, Fallen. 



Opomvza germinationis, Fall. Opom. 11, 1. Meig. Dipt. vi. 1. 

 Macq. Hist. Nat. Dipt. ii. 555, 1. Zett. Ins. Lapp. 761, 1. 



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