208 Mr. F. W. Edwards on 



having a median lobe which is much broader than long, and 

 the chispers being unusually broad. The empodia are less 

 than halt' as long as the claws, which are more slender and 

 sharply pointed than in many male Orthocladius (agreeing in 

 this respect with 0. festivus), and have each a long curved 

 hair arising from the base. The wing- membrane has no 

 distinct punctuation, the anterior veins are scarcely darkened 

 (a point not mentioned by Holmgren), and the costa extends 

 slightly but distinctly beyoud the tip of Ki. 



Key to the Species of Orthocladius and Dactylocladius 

 now known from Spitsbergen and Bear Island. 



1 . Thorax entirely black ( d $ ) 2. 



Mesoaotuni with yellowish ground- 

 colour ( 2 ) or at least yellowish on 

 the shoulders and part of pleurae ( c? ) • 6. 



2. Length 5 mm.; colour of halteres not 



stated ; wings of 5 with a few long- 

 hairs at the extreme tip subpilosus, Kieff. 



Length 2-3 mm 3. 



3. Halteres black or brown 4. 



Knob of halteres pale festivus, Holmgr. 



4. First eegment of frout tarsi only about 



half as long as the tibia petraus, var. ursinus, Kieff. 



First segment of front tarsi two-thirds 

 as long as the tibia 5. 



5. Wings pale greyish, moderately broad 



( 5 ) confonnis, Plolmgr. 



Wings dark greyish, very broad ( 5 ) . . obscuripennis, Holmgr. 



6. "Wings milk-white 7. 



Wings transparent or grayish 8. 



7. Front tarsi of J bearded ; c? thorax 



nearly all black consohrinus, Holmgr. 



Front tarsi of S not bearded ; meso- 



notal bands distinct (c5^2) arcticus, Kieff'. 



8. Body mostly brownish yellow; $ an- 



tennae 7-segmented heptameris, Kieff. 



Body largely blackish; mesonotum in 



$ with black stripes 9. 



9. Legs yellowish ; length 2 mm mivtus, Holmgr. 



Legs dark brown; length 2'5-3'5mm.. . 10. 



10. Empodia hardly one-third as long as 



the claws decorattis, Holmgr. 



Empodia nearly as long as the claws . . spitzbergoisis, Kieff. 



Cricotopus, v. d. Wulp. 



As now used by Kieffer, this genus includes those Ortho- 

 cladiariae which have hairy eyes and distinct pulvilli, 

 Trichocladius including those with hairy eyes and no pul- 

 villi ; species with and without white-ringed tibiae being 



i 



