Nematocerons Diptera of Jan Mai/en Island. 237 



long apical spine, directed inwards; tliere is apparently 

 no group of fine bristles at the base of the hyj)opy^inni 

 beneath. Three of the females agree in most respects ^vitll 

 the male, but Ri is practically as long as li and reaches 

 almost to the level of mf; in the fourth Ri is much shorter, 

 and this specimen probably represents a distinct species. 

 Some females, probably of this species^ were obtained by 

 Mr, Bristowe. 



4. Exechia frigida (tlolmgren) {Parexechiaconcolor^V'QQ\\Qv). 



Numerous specimens of this species were collected by 

 Mr. Bristowe, both sexes being represented. The colour of 

 the coxae varies ; most specimens have tliem dark, whereas 

 Becher says " gelb," but the specimens agree structurally 

 with the description, and there is no doubt about the identifi- 

 cation. The species is apparently identical with the North- 

 American E. costa, Johaniisen. There is no reason whatever 

 for maintainijig the genus Parexechi'a. 



" Common on the mossy patches.^' {Bristowe.) 



5. Scatopse pulicaricij Lw. 



Eecorded by Becher ; not found by Mr. Bristowe nor 

 examined by me. 



6. JDiamesa ? aherrata, Lundbeck. 



One damaged male of a Diamesa was present among 

 Becher's material, though not described by him ; one newly- 

 hatched female and one pupa evidently of the san^e species 

 ^^ere collected by Mr. Bristowe, the former in a mossy marsh, 

 the latter in a little pool at tiie base of the Saule Hock. 

 These specimens show all the characters mentioned by 

 Lundbeck in his description of D. aberrata, and it will 

 probably be safe to assume they are that species. Tlie 

 species apparently belongs to Xieffer's genus Syndiamesa^ 

 the eyes being quite bare and the fourth tarsal segment 

 almost cylindrical, only sliglitly emarginate at the tip, and 

 not much shorter than the fifth. In the male the last 

 antennal segment is more than twice as long as the remaining 

 flagellar segments together; the hypopygium is almost as 

 figured by Malloch for D. waltli, the spine of the anal 

 segment being very short, but the clasper is of rather a 

 different shape, being straight and rather narrow, blunt- 

 ended. In the female the scutellum and legs are pale 

 yellowish lU'obably owing to immaturity. The ])Lipa is 



