Diptera Xematocera/roin Sp'Usherjen . 207 



tliaii long. Tlie male hypopj'giuni is as in fig. 5 (p. \\)7). 

 The eiiipotlia are scarcely (listingnisliable iu the c? , about 

 one-tliird as long as the ciaws iu the $ . The costa extends 

 slightly bi'yond the tip of /^,, which is straight. 



I am acciuaintcd with a British species (as yet undeter- 

 mined) which is extremely close to 0. consubrinus, but dilTers 

 iu the form of the male clasper. 



Orthocladius decoratus (Holmgren). 



SiMTsBKKGKx : Brucc City, head of Klaas Billeu Bay, 

 14. viii ly.til ; on hut-window ; 1 ? . 



The single specimen appears to answer in almost every 

 respect to Holmgrens description. It differs from O.conso- 

 briniis $ in the greyish, finely punctuate wings and in the 

 longer cubital fork, the base of which is just perceptibly 

 before the base of M. The head is blackish in colour, unlike 

 that of Pseclrocludiua Umbatelliis ? , which is dingy yellow- 

 ish. The empodia are small, about as in O. consubrinus ? . 

 The costa extends very slightly beyond the ti|) of /?4. The 

 specimen seems too large to be the female of 0. festivus. 



Orthocladius festivus (Holmgren). 



Spitsbergen : Bruce City, head of Klaas Billen Bay, 

 l-i. viii. 1921 ; on hut-window ; 3 J . 



On acconnt of the black colour of the whole thorax, in- 

 cluding (as far as can be seen) the pleura?, and the yellow 

 halteres, I think this identification must be correct, though 

 it is rather ditlicult to decide between this and O. decoratus. 

 The wings are whitish, not perceptibly punctate under a 

 magnification of 80; the costa does not extend beyond the 

 tip of /?4. Hypopygium as in fig. 6 (p. 197). 



Orthocladius 7 conformis (Holmgren). 



Bkah Island: Walrus Bay, S.E. of island, 22. vi. 1921; 

 20-50 ft., quarter mile inland, under stones on shady slope; 



1 c?. 



I make this identification with some hesitation, since the 

 species was described from Spitsbergen, but the specimen 

 appears to agree in every respect with Holmgren's de- 

 scription. The terminal antemial segment is very little 

 longer than the remaining flagellar segments together, the 

 penultimate segment being almost twice as long as broad. 

 The hypopygium (fig. 7) agrees in most respects with 

 Kieffer's (Icscription of that of O. arcticus, the side-pieces 



