BRAC1IYCEKA. 



Table of all Families of Diptera except the NEMATOCEKA. 



1. Body not of leathery texture. Head free ; 



mouth generally well developed, with a 

 more or less prominent proboscis. Two 

 palpi and 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 

 curved 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- 



chsetous 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 eremoehaetous, and often 

 with dense furry pubescence, or bristly . . 8. 



3. Third antennal joint annulated, Eyes in $ 



normally contiguous or very approximate 

 (except in most NKMESTRINIDJE) ; in $ 



wide apart 4. 



Third antennal joint not annulated (except 

 XYLOPHAGINJE). Eyes in $ generally 

 contiguous 7. 



4. Posterior cells not parallel with hind margin 



of wing t- " Diagonal " vein never present. 



Eyes in $ normally contiguous 5. 



Posterior cells parallel with hind margin of 

 wing. " Diagonal ' ' vein generally present ; 

 wings often reticulate. Eyes in <5 gene- 

 rally separated ." Nemestrinidae, 



5. Tibiee with at least middle pair spurred [p. 144. 



(indistinctly in ACANTHOMKRIDJE). Veins 

 not crowded together in anterior part of 

 wing. Ambient vein present (thin in 

 ACANTHOMKRIDJE). Scutellum unspined. 6. 

 Tibiae without spurs (except in XYLOMYINJE 

 and some BERING). Veins crowded to- 

 gether anteriorly (except XYLOMYIN^: 

 and BERINJE). Ambient veiii absent or 



* Middle one sometimes shorter in NEMESTRINID.E, but always pad-like. 



t Some CYRTID,K form exceptions, but the enormous thoracic squamae, 

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

 them. 



