238 Mr. F. W. Edwards on the 



extremely similar to those described by Pottliast and Tliiene- 

 niann, but differs in regard to the bristles on the hiteral 

 abdominal flanges. These are dark in colour, less than half 

 as long as the segments, and almost equidistant^ 



7. Metnocnemus callosus (Becher). 



Becber's types comprised 2 c? , 2 $ (not 1 c^, 3 ? , as he 

 stated). All the specimens are apparently newly emerged, 

 besides having faded in alcohol ; hence Becher's description 

 is valueless as regards coloration. The true mature colour is 

 shown by some specimens collected by Mr. Bristowe ; in 

 these the body, antennae, and legs are uniformly dull black, 

 also the halteres of the male, the female halteres being 

 yellowish. In both sexes (not only in the female, as indicated 

 by Becher) the wings are distinctly milky white. A careful 

 examination of all the specimens shows that there are a few 

 hairs present at the extreme tip of the wing, about 10-15 in 

 the male and 20-30 in the female. On this account, and 

 also because of the conspicuously hairy legs, the species 

 seems better placed in Metriocnemus than in Oithodad'nifi. 

 The male antennae are missing in Becher's specimens, but in 

 Bristowe's the last segment is a little more than twice as 

 long as the rest of the flagellum. According to the descrip- 

 tion, Kieffer's Dactyl ocladius suhpilosus from Bear Island 

 and Metriocnemus similis from Novaia Zemlya must be 

 extremely similar to 71/. callosus^ and may possibly prove 

 identical. 



8. Orthocladius ? conformis (Holmgren). 



A single male was collected by Mr. Bristowe which may 

 provisionally be regarded as a variety of 0. confornds. In 

 regard to the structure of its antennae, hypopygium, claws, 

 and empodium, it agrees rather closely with tlie specimen 

 recently mentioned by me from Bear Island, but the halteres 

 are yellow instead of black. 



9. Orthocladius sp. 



Two ? , near or identical with Dactylocladius pleuralis, 

 Mall., described from North America, and perhaps also 

 identical with a common European species for which some 

 earlier name no doubt exists. This may possibly be the 

 female of 0. covformisj mentioned above, but, in addition to 

 the striking difference in the colour of the thorax (all black 

 in O. cortjormis, yellow with three well-separated brown 



