Dolichopodidae. 63 



spiracular tubes in the Dolichopodid pupæ is understood. The pupa 

 rests inside this cocoon, and at the time for the final development it 

 works out, the cocoon then being somewhat daraaged. I think it 

 very probable, that all species of Dolichopus form a similar cocoon. 

 When the earlier authors have not seen the cocoon, it is, I think, 

 because this is easily destroyed when seeking for the pupa; or when 

 the imago is bred from the larva, the pupal skin will be found out- 

 side the cocoon, which latter in its then somewhat damaged condition 

 does not easily attrået observation. — The larva hibernates, the 

 pupation and final development taking place in spring or summer. 



The species of Dolichopus are beautiful and lively flies; they 

 occur on bushes and in low herbage, generally on humid piaces, in 

 the outskirts of and in open districts in woods, in fens and meadows, 

 and most species occur at or near water, some on water piants; a 

 great number of species occur especially near the coast; only few 

 may be found on more dry localities. It is the genus of Dolichopodids 

 which goes farthest towards the north, two species being found in 

 Greenland, one of which is our common B.plumipes. 



Of the genus about 117 species are at present known from the 

 palæarctic region; 45 have been found in Denmark, but of these one 

 is here described as new, the total number of palæarctic species thus 

 increasing to 118. 



Table of Species. 

 Males. 



1. Femora black 2. 



— Femora pale 16. 



2. Lower postocular bristles black 3. 



— Lower postocular bristles pale 12. 



3. Tibiæ black (niiddle tibiæ in Stenhammari with a 



white ring) 4. 



— Anterior tibiæ quite or mainly yellow or ferruginous ... 9. 



4. Wings blackish on the outer half; hind metatarsi 



very bristly 1. atratus. 



— Wings not blackish on the outer half; hind metatarsi 

 moderately bristly 5. 



5. Last joint of front tarsi dilated 6. 



— Last joint of front tarsi normal 7. 



6. Last joint of front tarsi depressed, flat; posterior 



femora with longish, pale hairs below on basal part 2. Falleni. 



— Last joint of front tarsi compressed; hind femora 



with a long, black fringe below 4. melanopus. 



7. Posterior femora with longish, pale hairs below on 

 basal part; the three middle joints of the front tarsi 

 ferruginous 3. Meigenii. 



