BOMBYLID.E 481 



appear to be the true " first long-vein," in the comparatively short subcostal vein, in the 

 usually -wide open cubital fork (when present) which inckides the wing-tip in a 

 similar fashion to the I'ahanidce, in the variation in the length of the prjefurca, and 

 the position of the discal cross-vein, and in the frequently most remarkable loop of 

 the radial vein near its end which may turn up rectangularly or even be looped back 

 into the costa. 



Tahlc of flic Subfamilies of BOMBYLID^. 



1 (8) Proefurca short (fig. 270), and the radial vein emitting the cubital 



vein at an acute angle far before the discal cross-vein. Antennae 

 almost always approximated at the base. Frons narrowed in 

 the male so that the eyes almost or quite touch, or if the eyes 

 be widely separated in the male (as in some species of Usia) 

 then the abdomen unusually broad and short and usually 

 almost bare. 



2 (5) Abdomen rounded or oblong, usually furry, or with soft pubescence. 



Antennae never conspicuously long. Occiput inflated. 



3 (4) Abdomen short and rounded ; usually both thorax and abdomen 



clothed with furry pubescence. Eyes without an indentation 

 on the middle of the hindmargin. Proboscis always long, and 

 with very small sucker-flaps except in the species with a 

 simple cubital vein {Platyptjgus, etc.). Thorax usually arched, 

 almost circular, and almost without bristles. Radial vein 

 never with a strong loop before its end. Head usually 

 narrower than the thorax. Bombylin^ (p. 483). 



4 (3) Abdomen oblong, rather flattened, and seldom with furry pubescence. 



Eyes often with an indentation at the middle of the hindmargin. 

 Proboscis usually short and with fairly broad sucker-fiaps. 

 Thorax comparatively flat, thinly haired, but with some strong 

 bristles towards the sides. Head usually as wide as the thorax ; 

 frontal triangle large. Ptadial vein almost always with a 

 strong loop just before its end, and ending rectangularly or 

 recurrent in the costa; posterior cells always four; discal 

 cross-vein often sloping. Lomatin^ (p. 506). 



5 (2) Abdomen long and tubular, either bare or with conspicuous 



bristly hairs. Eyes without an indentation at the middle of 

 the hindmargin. Antennae usually very long, especially the 

 basal joint. Proboscis almost always long. Thorax more or 

 less humped. Discal cross-vein upright. 



6 (7) Abdomen, legs, and antennae remarkably long and bare. Occiput 



hollowed. Posterior cells three only. Prothorax normal. 

 Eyes usually touching in both sexes. Systkopin^ (p. 513). 



7 (6) Abdomen and legs moderately long, and often with bristles or 



bristly hairs. Occiput inflated. Thorax almost always with 

 strong bristles on the disc, and very much humped against the 

 head. Abdomen very much drooped downwards. Prothorax 



2 H 



