Dipfera Nematoeera from Spitsbergen. 213 



Marble Island, Spitsbergen, 26. viii. 1911 {M, A. Fenton). 

 The eyes are shorth' but conspicuou^^ly hairy; the antennie 

 are plumose, 13- or 14-segmented, the terminal segment 

 about one-third longer than the remaining flagellar segments 

 together. The hypopygium (fig. 13) is similar in structure 

 to that of the American species figured by jMalloch as 

 D. iraltli, Mg., but the side-pieces and the spine of the ninth 

 tergite are much more elongate. The species identified as 

 D. orctica by Kieffer in 1911 (renamed by him in 1919 

 D. lundstroemi) has quite a different hypopygium. 



Diamesa poidtoni, sp. n, 



Spitsbergen : Green Harbour, S. side of entrance to 

 Ice Fjord, 28. vi. 1921 ; 0-100 ft., flying ; 4(^ , 2 ? . 



Prince Charles' Foreland : Pt. Carmichael, Freshwater 

 Bay district, N.E. of island, 1-10. vii. 1921 ; 30-100 ft., at 

 flowers of Saxifraga oppositifolia, on tundra of shingly 

 raised beach, flving and resting on snow and under stone on 

 hill; 5 c?,9 ?. 



Head blackish, rather conspicuously dusted with grey, 

 especially in the ? ; frons without a definite central channel. 

 Eyes bare in both sexes ; widely separated, entire. ^Nlouth- 

 parts and antennoe entirely blackish. Antennae of ^ 

 plumose, 14-segmented, basal flagellar segments transverse, 

 penultimate segments about as broad as long, terminal seg- 

 ment about one-third to one-half longer than the remaining 

 flagellar segments together. Antennie of $ 8-segmeuted, 

 segment 2 rather stout, nearly half as long again as broad, 

 scarcely constricted ; segments 3-7 short, rather ill-defined, 

 and gradually diminishing in size, segment 8 as long as 

 segments 5-7 together. Thorax blackish, in ? with fairly 

 distinct grey dusting which leaves the usual three mesonotal 

 stripes black. Scutellum with long and moderately dense 

 black hair. Abdomen blackish brown, with brownish hair. 

 Hypopygium (fig. 14) : ninth tergite with a lona; sharp 

 terminal spine : side-pieces with flat, bare, and pointed basal 

 lol)es and small, slightly hairy, and subapical lobes ; claspers 

 stout on the basal third, then rather abruptly narrowed, 

 tapering to a rounded point, no terminal spine. Lamellse 

 of ovipositor (fig. 15) small, black. Legs Ijlackish, short- 

 haired, hairs on front tarsi of ^ very slightly longer. First 

 segment of front tarsi about two-thirds to four-fifths as long 

 as the tibia, fourth segment of all tarsi about two-thirds to 



