BRACIIYCEKA. 



TahJe of all Families of Dlptera except the Nematocera, 



1. Body not of leathery texture. Head free ; 



mouth ji-euerally well developed, with a 

 more or less prominent proboscis. Two 

 palpi aud at least two oral bristles present. 

 Femora approximate at base. Abdomen 

 distinctly segmented. Oviparous or larvi- 

 parous ; in perfect state never parasitic on 



warm-blooded creatures 2. 



Body of leathery texture. Head placed in a 

 curA'ed excavation of the thorax or bent 

 back upon the thorax. Mouth very imper- 

 fect ; palpi absent. Abdomen indistinctly 

 segmented. Femora at base remote, through 

 the broad mesothorax ; claws well deve- 

 loped. Parasitic during- pupal and imaginal 

 stages in warm-blooded creatures (mammals 

 and birds) 23. 



2. Three distinct pulvilli. Absolutely eremo- 



cheetous species (i. e., no strong bristles on 

 head or thorax as compared with pubes- 

 cence) 3. 



Two pulvilli (sometimes obsolete or absent).* 

 Species not truly eremochastous, and often 

 with dense fiirr}' pubescence, or bristly . . 8. 



3. Third antennal joint annulated. Eyes in <$ 



normally contiguous or very approximate 

 (except in most Nemkstb,inid.«;) ; in 5 



wide apart 4. 



Third antennal joint not annulated (except 

 Xylophagin-^j. Eyes in J generally 

 contiguous 7. 



4. Posterior cells not ptirallel with hind margin 



of wing f. " Diagonal " vein never present. 



Eyes in S normally contiguous 5. 



Posterior cells parallel with hind margin of 

 wing. " Diagonal ' ' vein generally present ; 

 wings often reticulate. Eyes in cJ gene- 

 rally separated Nemestrinidae, 



5. Tibia) with at least middle pair spurred [p. 144. 



(indistinctly in Acanthomkrid^t;). Veins 

 not crowded together in anterior part of 

 wing. Ambient vein present (thin in 

 Acanthomkrid.t:). Scutellum unspined. 6. 

 Tibias without spnrs (except in Xylomyin^t; 

 and some Brrixje). Veins crowded to- 

 gether anteriorly (except Xylomyin^ 

 and Berin-t;). Ambient vein absent or 



* Middle one sonietinies sliorter in Nemestiunice, but always pad-like. 



t Some Cyrtid.e fonn exceptions, but the enormous thoracic squamje, 

 globular bodies, and general appearance of this family at once distinguish 

 them. 



