704 ASILID^ 



DASYPOGONINiE. 



Marginal cell open (fig. 369), or rarely just closed through the radial 

 vein curving up so suddenly as to cause the marginal cell to end bluntly 

 (fig. 385). Pul villi and claws normal, or if abnormal then the alula and 

 hind angle of the wing fully developed. Antennae with a style, but (in 

 Palsearctic species) without an arista. 



Pig. 369. — Dioctria linearis S . x 5. 



Palpi two-jointed. Antennae with a terminal style, which may be two-jointed 

 but which never approximates to an arista (except in Damalis). 



Thorax ranging from having bristles and very little pubescence (Biocti'ia, etc.) 

 to being coarsely pubescent and without bristles {Isojyogon) ; metapleurse some- 

 times quite bare (Stenopor/on,, etc.), sometimes with a large dense tuft of long 

 pubescence (Cyrtopogon, etc.), or sometimes with a fan of bristles near the hind margin 

 (Lasiopogon) ; when the metapleurae are bare the alar squamae are provided mth a 

 long tufted fringe which may act as a substitute shelter to the metathoracic stigma. 



Abdomen normally elongate with almost parallel sides and without conspicuous 

 pubescence, but occasionally stout and densely pubescent. Genitalia of the male 

 of very diverse types, one form {Dioctria) having a large dorsal plate which covers 

 the lamellae while another form {Lasiopogon) has large lateral lamellae which form 

 forceps as in the Asilince. 



Legs provided with bristles and with terminal circlets on the tibiae and four 

 basal joints of the tarsi, but the bristles seldom very powerful : front tibiae often 

 provided with a powerful curved thorn or claw at the tip. Claws and pulvilli 

 normal or when abnormal then the alula and hind angle of the wing well developed. 



Wings with the subcostal vein comparatively short and consequently with the 

 radial vein ending simj)le in the costa, but in a small group of genera the radial vein 

 is bent up rather suddenly and reaches the subcostal vein at or very close to its 

 end so that in such cases the marginal cell has a bUmt end and may be just closed ; 

 discal cross-vein varying in position but never far from the middle of the discal 

 cell, usually upright but occasionally {Microstylum) very sloping ; discal cell long, 

 emitting three veinlets from its end, though sometimes {Microstylum) the upper two 

 veinlets start close together from the top corner so that the upper one curves out 

 into the first posterior cell, and the third veinlet may be suthciently recurrent to 

 run back parallel with the winginargin until it meets the upper branch of the 

 postical vein well before the wingmargin, while the upper veinlet sometimes meets 

 the lower branch of the cubital fork before the wingmargin and thereby closes the 

 first posterior cell ; small cross-vein sometimes absent but in such cases the upper 

 branch of the postical vein only j ust touching the lower margin of the discal cell ; 



