lM4 .Mr. F. W. Edwaicls on 



three-iinarters as long as tlie fifth, not very broad, cniar- 

 ginate apically. Kmpodia al)out two-tliirds as long as the 

 claws. W'itu/s slightly greyish-tinged. Lobe right-angled 

 or slightly produced. Costa extending slightly beyond the 

 tip of i?4. Costal cell much broader in ? than in ^ 

 (as usual) and tip of R^ swollen in ? . Cross-vein r-m long, 

 strong, curved, 2 5-3 times as long as 7)i-cu ; distance be- 

 tween ?•-/?? and /«-CM variable, but short. Halteres yellowish. 

 Wing-length 4-5 mm. ; body-length, ^ 4— 4"5 mm., ? 

 2-7-3 7 mm. 



It is quite likely that this may have formed part of 

 Holmgren's series of D. arctica, especially since some of his 

 material came from Green Harbour, but as he states that 

 the lamellte of the ovipositor are testaceous, not black, I 

 have not adopted his name for the species. There is in the 

 British Museum a female apparently belonging to this 

 species from Novava Zemlya (Matotchski Sound, 23 June, 

 1880, Captain A. II Markham, R.N.). 



Diamesa poultoni, va.r. /{avipi/a, n. 



Prince Charles' Foreland : Pt. Carmichael, Fresh- 

 water Bay district, N.E. of island ; 3 ? . 



Differs from typical D. poultoni as follows : — Wings 

 almost milky; hair on scutellum yellow, instead of black. 



Diamesa septima, sp. n. 



Bear Island: south of island, 17. vi. 1921 ; flying over 

 barren Tetrndium limestone ; 1 ? . 



Differs from D. poultoni as follows : — Second antennal 

 segment smaller, scarcely longer than broad. Lamellae of 

 ovipositor yellow and rather more rounded (fig. 16). Fourth 

 tarsal segments rather shorter, about 0'6 as long as the 

 fifth. Cross-vein r-m shorter, scarcely twice as long as 

 m-cu. Wing-length 4 mm. ; body-length 3'2 mm. 



Key to the Species of the Diamesa Group now known 

 from Spitsbergen and Bear Island. 



1. Cross-vein r-w short and transverse, 

 m-cu long and oblique ; legs largely 



whitish PsUodiamesa spitzbergensu, Kieff. 



Cross-vein r-m long and oblique, 

 m-cu short and transverse ; legs 

 blackish 2. 



