I 



Diptera Nematoceru from Spitsbergen. 205 



'2. Small pul villi preseut itercorurius, Uej^. 



Pulvilli abatut 3. 



3. Costa ending abruptly at tipof i2i ; e}e» bare . oxoniattut, sp. n. 

 Costa produced well beyond tip of iif, ; eyes 



pubescent 4. 



4. Base of cubital fork vt-ry little distant from 



the base of M (scarcely the length (if the 



crots-vein) cuninervis, var. polans, Kieflf. 



litise of cubital fork much beyond the base of 

 M (twice the length of the cross-vein or 

 more) 5. 



5. J{^ approximated to the costa apically ; costa 



reaching far beyond the tip o{ Jii G. 



Jii not approximated to the costa apically ; 

 costa extending only a short distance beyond 

 the tip of i2i 7. 



6. Length 3 mm. ; second antennal segment 



cylindrical, scarcely constricted ; last palpal 

 segment at least half as long again as the 

 penultimate ; fourth tarsal segment shorter 

 than the hfth, and only twice as long as broad 8j){tzbergensis,K.ie{i. 

 Length 2 mm. ; second antennal segment con- 

 stricted near the base ; last palpal segment 

 hardly longer than the penultimate ; fourth 

 tarsal segment hardly shorter than the fifth, 

 and nearly three times as long as broad .... longicosta, sp. n. 



7. Length 3 mm. ; male claspers with two spines . Jlexinervis, Kielf. 

 Length 1*5 mm. ; male clasper with only one 



spiue extretnus, Holmgr. 



8. Mesonotum with hairs only pumilio, llolmgr. 



Mesonotum with short lanceolate scales mi.xed 



with the hairs eltoni, sp. n. 



Psectrocladius borealis, Kieff. 



Spitsbergen : Bruce Citv, head of Klaas Billen Bav, 

 10. vii., 19. viii., and 14. viii'. 1921 (C. S. Elton and R. R 

 Stobart) ; 0-50 ft., on shingly raised beach and on liut- 

 window ; 100 c? , 28 ? . Cape Bolieman, N. side of Ice 

 Fjord, 12. vii. 1921 ; rocky tundra near coast ; 7 <? , 1 ? .^ 



I think there can be very little doubt of the identification, 

 though tlie male antennte differ slightly. Kieffer states that 

 segments 12 and 13 are as long as l)road, and segment 1-1 

 twice as long as 2-13 together, whereas in our specimens 

 (observed in the dry state) segments 12 and 13 are broader 

 than long, and segment 14 is nearly three times as long as 

 2-13 together. The species is extremely similar to P. car- 

 bonarius (Mg.), Goetghebuer, but differs in the longer 

 terminal spine to the male claspers and in some other small 

 points. 



