Dolichopodidae. 317 



Of the genus about 33 species are known from the palæarctic 

 region, and besides some uncertain; 13 have been found in Denmark, 

 but of these one is here described as new, the number of palæarctic 

 species thus increasing to about 34. Certainly some more species will 

 be found in Denmark. 



Tahle of Species. 



1 . Scutellum with two bristles 2. 



— Scutellum with four bristles 4. 



2. The whole epistoma densely whitish pruinose 3. 



— Epistoma brownish pruinose above the transverse 



ridge, metallic shining below 3. micaceus. 



3. Legs yellow 1 • plumbellus. 



— Legs black 2. seniculus. 



4. Middle tibiæ whhout bristles above near the base . 4. tnuralis. 



— Middle tibiæ with one or a pair of bristles above 



near the base 5. 



5. Acrostichal bristles distinct, not short; thorax not 

 striped ; legs with at least the knees pale (only very 

 slightly in melandwlicus) 6. 



— Achrostichal bristles short or very short ; thorax • 

 striped, except in atnbiguus, which has the front 

 coxæ almost silvery pruinose, and infamatus, which 

 has the epistoma brown pruinose above, black below; 



both species with quite black legs 8. 



6. The last part of the postical vein one and a half 



times as long as the cross-vein 7. 



— The last part of the postical vein about as long as 



the cross-vein 7. melancholicus. 



7. Larger species; legs chiefly black and coxæ dark- 



haired 5. apicalis. 



— SmaUer species; legs chiefly pale and pale-haired . 6.pallipes. 



8. Legs chiefly yellow 10. diadema. 



— Legs black, or only the knees reddish or yellow 9. 



9. Legs quite black 10. 



— Legs with the knees pale 11. 



10. The whole epistoma metallic, shining; front coxæ 



almost silvery pruinose 8. anihiguus. 



— Epistoma brown pruinose above the transverse ridge; 



front coxæ not silvery pruinose 9. infumatus. 



11. The whole epistoma greyish pruinose W.jaciilus. 



— Epistoma metallic shining below the transverse ridge. . . 12. 



12. The last part of the postical vein longer than the 

 cross-vein; first and second part of the discai vein 



of about the same length 12. truncorum. 



— The last part of the postical vein shorter than the 

 cross-vein; first part of the discai vein considerably 



longer than the second 13. petrophilus. 



