88 LIST OF DIPTERA. 



spines ; knees yellow ; shanks with two long spines at their tips ; 

 feet reddish brown : wings slightly tawny, with gray tips, and each 

 having a brown spot near the fore border a little before the middle ; 

 veins brown ; poisers yellow, with brown tips. Length of the body 

 5 lines ; of the wings 8 lines. 



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

 G. Barnston, Esq. 



Ditomyia, Winnertz. 



Ditomyia Boleti, Kaltenbach. 



a. Aix la Chapelle, Prussia. From Mr. Walker's collection. 



Symmerus, n. g. 



Allied to Platyura. Feelers like those of Platyura, 16-jointed ? 

 a little longer than the chest: abdomen compressed, rather long: 

 shanks bristly, their tips armed with two long spines : wings with 

 only two distinct longitudinal veins ; the first curves slightly to the 

 hind border of the wing, a very angular cross vein connects it with 

 the second vein ; from this vein proceed three branches ; the first 

 and the second come forth below the angle, and the second is 

 shortly forked ; the third is more robust than the second, and is 

 forked a little before half its length : the second longitudinal vein is 

 simple, and runs near the fore border, which it joins before the tip 

 of the wing. 



Symmerus ferrnginens, n. s. Fulvus, abdomine flaw fasciis fuscis, 

 antennis fuscis, pedibus fulvis, alis subfulvis. 



Body tawny : abdomen yellow, clothed with short pale hairs ; 

 a broad brown band on the fore border of each segment: eyes 

 black : feelers brown, yellow at the base : legs tawny ; hips long ; 

 bristles and spines of the shanks black: wings slightly tawny; 

 veins brown; poisers tawny. Length of the body 3 J lines ; of the 

 wings 7 lines. 



a. England. 



Platyura, Meigen. 



Div. A. Meig. Dipt, pi. 8, /. 14. Macq. Dipt. i. 141. 



Platyura marginata, Meig. Dipt. i. 232, 1, pi. 8, /. 14. Macq. 



Hist. Nat. Dipt. i. 141, 1. Blanch. Hist. Nat. Ins. iii, 573. 

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



