283 



Keys to Genera 

 larvae 



Pseudopods present on prothorax and apical abdominal segment. .2 



Pseudopods absent, body worm-like (PL XLII, Fig. 6) 



Pseudoculicoides, Culicoides, Palpomyia, etc. 



Body circular in cross-section, armed with long bristles, some of 

 which are leaf -like (PI. XLII, Figs. 1, 2, 3) Forcipomyia. 



Body flattened, oval in cross-section, armed with short simple bris- 

 tles (PI. XLII, Fig. 4) Ceratopogon. 



PUPAE 



1. Thorax without long bristles 2 



— Thorax with long bristles 3 



2. Thorax with short, pointed protuberances Culicoides. 



— Thorax without distinct protuberances, at most with slight eleva- 



tions (PI. XLII, Fig. 5) Palpomyia, etc. 



3. Second abdominal segment with 4 bristles Ceratopogon. 



— Second abdominal segment with about 10 bristles Forcipomyia. 



IMAGINES 



1. Wings with distinct hairs on disc, either in the form of short up- 



right microscopic setulae or broad decumbent scales 2 



— Wings without hairs on disc, rarely with a few near apex of costal 



margin 6 



2. Thorax with a distinct slit-like or circular depression on each side 



of disc slightly caudad of the inner angle of prothorax ........ 



Culicoides. 



— Thorax without these depressions 3 



3. Wings densely hairy, decumbent scale-like hairs present on whole 



surface 4 



— Wings with upright hairs which are usually absent on anal angle, 



no scale-like hairs present 5 



4. Basal joint of hind tarsi shorter than, or at most as long as, second 



Forcipomyia. 



— Basal joint of hind tarsi very much longer than second 



Euf orcipomyia . 



5. Empodia absent; first and third veins of wings fused; tarsal claws 



of female very unequal in length Neoceratopogou. 



— Empodia present; first and third veins of wings connected by a 



cross- vein ; tarsal claws of female equal Ceratopogon. 



6. First and third vein connected by a cross- vein or fused basally. . .7 



— First and third veins disconnected for their entire length 11 



7. At least one pair of femora with distinct ventral spines 8 



