70 



Syrphidae. 



and Charlottenlund (Stæger). The dates are ^^/s — ^^/s; in Ermelund I 

 took it in some number on ^^/s and ^"'/s, it occured on a humid, some- 

 what shaded plaee, especially on the leaves of Aegopodium. 



5. Cnemodon Egger. 



This genus is like the preceding chiefly agreeing with Pipizella. 

 The species are rather small, of black colour. Frons not protruding 

 and in the male it is arched; in the female it has a transverse depres- 

 sion; there are no, or at all events only very small side dust spots. 

 Antennæ short, the third joint not or only a little longer than broad. 



Heads of C. fulvimanus in profile. 

 Fig. 19. Male. Fig. 20. Female. 



Abdomen elongate and somewhat narrow, not broader than thorax. 

 Male genitalia forming a rather large knob at the end of abdomen, 

 the ninth segment v^ith its appendages somewhat long. In the female 

 the abdomen narrowed towards the end and thus somewhat pointed. 

 Legs slender, hind metatarsi slightly thickened. In the male the 

 middle coxæ have a straight .spine, hind coxæ a short spine at the 

 apex, and hind trochanters a long, somewhat dilated spine; anterior 

 tibiæ somewhat dilated, especially the middle tibiæ have a knob on 

 the anterior side; anterior metatarsi a little compressed. Wings with 

 the upper marginal cross-vein starting with an obtuse angle, a little 

 upwards bent more or less angularly outwards, the upper angle acute; 

 mediastinal vein ending after the medial cross-vein. 



The developmental stages of C. vitripennis are described by Heeger 

 (Sitzungsber. d. kais. akad. d. Wissenschaft. Wien. Mat. Nat. Cl. 31, 

 1858, 295, Taf. I, Fig. 1—6). The larva lived on Coccids on Populus 



