DIPTERA BRACHYCERA 



ENERGOPODA 



Two pad-like pulvilli only. Strong bristles occurring on 

 the thorax and legs (unless replaced by dense coarse 

 pubescence). Venation including a long cubital fork, five 

 posterior cells, and a long anal cell. Pedestrian flies of 

 strongly predaceous habits (in at least the Asilidw). 



Head always dichoptic, more or less excavated about the vertex so as 

 to give the eyes a bulging appearance. Face in the Asilidce with a face- or 

 mouth-beard, which however is not present in the Apioceridm. Collar usually 

 well developed and bearing strong bristles. Proboscis prominent and horny 

 in the Asilidce, or with fleshy sucker-flaps in the Apioceridce, but never long 

 and porrect. Palpi usually rather long and thin in the Asilidce, but 

 conspicuous and spatulate in the Apioceridce. Eyes always bare, with the 

 facets sometimes considerably enlarged on the front part in both sexes. 

 Antennas composed of the usual three joints, the third one being never at 

 all annulated but usually with a terminal (never dorsal) style or arista. 



Thorax ordinarily with strong chtetotactic bristles besides bristly 

 pubescence, amongst which can be detected the prsesutural, postalar, 

 sometimes supra-alar and dorso-central bristles, while the pleurte fre- 

 quently have bristles or bristly hairs on the metapleurse and hypopleurae, 

 and these latter often form fans, but sometimes the bristles are reduced to 

 a single prsesutural and a single supra-alar {Le^Jtogaster) or in other cases 

 dense coarse pubescence may obliterate all the bristles {Laphria, etc.). 

 Scutellum ordinarily with long strong marginal bristles but otherwise 

 unarmed ; metanotum to a large extent under the scutellum. 



Abdomen usually rather elongate, often bearing bristles in a row just 

 before the hindmargins of the segments. Genitalia of the male and the 

 ovipositor of the female almost always large and conspicuous, and the 

 latter often with a terminal circlet of stout blunt spines. 



Legs strong, essentially adapted in the Asilidce for pouncing on and 

 seizing other insects and consequently provided with strong bristles on the 

 tibiae and tarsi, and with a circlet of bristles at the tip of all the tibiae 

 and of each of the four basal joints of the tarsi, but any bristles on the 



CIO 



