122 On Diptera from Spitsbergen and Bear Island, 



Abdomen the colour of thorax, witli a slight reddish-brown 

 tinge on at least the lower part of the somewhat globular 

 hypopygium. Genital lamellse rather slender and pointed, 

 more like those of inscripla than those of serrata or modesta. 

 Hind-marginal bristles short, fine^ and inconspicuoas. 



Legs coloured much as in modesta — i. e.y with the tro- 

 chanters, extreme base and tip of femora, tibiae (except for 

 more or less extensive darkening about middle), and base of 

 at least the four anterior tarsi obscurely yellowish. No 

 bristles above hind femora towards tip. Middle tibiae witli 

 a slight dilation or projection at extreme tip beneath, on 

 which 1-2 apical spurs are placed (there is a somewluit 

 similar dilation in true rujicauda, Zett., and inscripta, Mg.). 

 No hook or projection at tip of basal joint of either front or 

 hind tarsi. Wings rather short and narrow, with tlie costal 

 spines very inconspicuous, hardly longer than the other costal 

 pubescence. Halteres yellow, with slightly dusky knobs. 



? . Closely resembling the male, but abdomen more 

 pointed, terminating in a pair of long yellowish-brown 

 papillse, clothed with short dark hairs and each with a pair of 

 quite long hairs at the tip. Middle tibise without the pro- 

 jection at tip beneath of male. Wings rather longer than in 

 male. 



Length 3-4 mm. 



2 ^ (^ and 3 ? ? taken by C. S. Elton at south-east corner 

 of Bear Island (between North Cape and Spitsbergen) near 

 South Harbour, in moss of glaucous gull's nest, on June 22nd, 

 1921 ; also taken in the island of St. Kilda in June-July 

 1905 by Eev. J. Waterston; the latter being the ''No. 90, 

 Blepharoptera sp. !, 4 (^ (^ and 2 ? $ undetermined," men- 

 tioned in Grimshaw^s paper on the Diptera of St. Kilda in 

 'Annals of Scottish Natural History,' 1907, p. 156. 



Several species of Leria have been described or recorded 

 from the extreme north, such as serratn^ L., modesta^ Mg., 

 inscriptaj Mg., geniculata, Zett., tibialis^ Zett.^ minuta, Zett., 

 boreuUsy Bohem., and macuiipennisj Beck. Of these the 

 first three are distinct species well known to me ; geniculata 

 was described by Zetterstedt as having " setis mystacinis 

 utrinque pluribus '^ like serrata; tibialis^ Zett., is placed by 

 modern writers as a small variety of serrata^ and I have a 

 note made many years ago of a male in Zetterstedt's collec- 

 tion that the genital lamellse resembled those of serrata ; in 

 any case, it appears to differ from septentrionalis in having 

 paler antennse, frons, and tibiae, and a slightly iufuscated 

 cross-vein ; r)ii?iuia, Zett., with " antennis, fronte .... pedi- 

 busque rut'o-testaccis," must be a paler species than se^jten- 



