DASYPOGONJNAE 



ROBBER FLIES OF THE WORLD 



229 



few long hairs, a tuft of pile present on the anterior ex- 

 tension of the pteropleuron in front of the wing. 

 Whole pleuron micropubescent. Metanotal slopes 

 without pile. Hypopleuron with 1 or 2 hairs and long 

 and short micropubescence. Metasternum laterally 

 with pile; postmetacoxal area membranous. Anterior 

 basal are with numerous, slender bristles or bristly hairs ; 

 presternum dissociated. 



Legs: The hind femur rather slender, considerably 

 longer than the anterior pairs; it is of more or less uni- 

 form thickness, with abundant, flat appressed, short, 

 fine pile; below it bears a few fine, sharp, oblique, 

 slightly longer bristly hairs. There are no dorsoapical 

 or other bristles present except a single, rather stout 

 bristle laterally at the basal fifth. All coxae with 1 

 stout, posterior bristle ; anterior coxa with 7 additional 

 and middle coxa with 2 or 3 additional bristles. Hind 

 tibia with moderately long, oblique stout bristles con- 

 sisting of 3 dorsal, of which 1 is at the extreme base, 

 1 at the middle, and 1 at the outer forth ; 1 dorsolateral 

 at the base, 2 lateral, of which 1 is at the middle and, 

 1 at the apical fifth, and 3 ventral bristles. The tibial 

 apex bears a very stout apical, 2 weak lateral, 1 weak 

 medial, 1 weak and 2 stout long ventral bristles. Mid- 

 dle femur with 1 stout, posteroapical bristle and 1 

 ventral basal bristle. The middle tibia has very long, 

 extremely stout bristles which consist of 2 antero ventral 

 elements, 1 at the middle, 1 at the apical fifth, also 5 

 short, stout posteroventral, 4 dorsal and 3 anterodorsal 

 bristles; the middle anterodorsal element is extremely 

 long ; its apex bears 2 dorsal, 1 medial, 2 anterior and 1 

 extremely long, ventral bristle. Anterior femur with 

 1 short, posteroapical bristle and an equally short anter- 

 obasal bristle. Anterior tibia with 4 short dorsal, 2 

 ventral, besides 7 short, posteroventral bristles. The 

 apex of the anterior tibia bears a very thick, short, 

 curved spine which proceeds from a basal extension and 

 is curved against a low, denticular protuberance of the 

 basitarsus. Claws long, gently curved, convergent, the 

 pulvilli oidy half as long as the claws, the empodium 

 reaching nearly the full length of the claws and thick- 

 ened basally. 



Wings: The marginal cell open by a little less than 

 its maximal width. The second submarginal cell is 

 narrow basally and arises entirely above the third vein ; 

 the anterior branch of the third vein arises well before 

 the apex of the wing but the posterior branch ends a 

 considerable distance behind the apex. The fourth 

 posterior cell is closed with a short stalk. The third 

 posterior cell has almost exactly the same form as 

 Diogmites. The alula is large, the ambient vein 

 complete. 



Abdomen: The abdomen is elongate, tapering and 

 subcylindrical beyond the fourth tergite : the basal ter- 

 gite is slightly flattened towards the middle. The first 

 tergite laterally has an oblique, vertical row of 6 long, 

 stout bristles. Eemaining tergites with fine appressed 

 or subappressed pile, a little longer towards the side 

 but without special bristles laterally or special pile 

 posteriorly. Sides of all of the tergites rather strongly 



curved over. Male terminalia rather large and con- 

 spicuous, and rotate. It is quite similar to Diogmites. 

 The epandrium is cleft to the base, with the two halves 

 divergent from the base, but it is a comparatively small 

 structure with each half subtriangular, bluntly rounded 

 at the narrow apex and a little convex dorsally. The 

 gonopod is the most prominent element; it is bulbous 

 and convex laterally, well demarcated and bears a 

 toothed, posterodorsal process. Hypandrium large, 

 broad, convex but obtuse apically. Whole terminalia 

 rather densely beset with long, bristly hairs which arise 

 from all parts but especially from the gonopod and 

 hypandrium. Proctiger with a medial notch and ex- 

 tending short distance beyond the epandrium. Female 

 terminalia with acanthophorites and 5 pairs of long, 

 attenuate, sharp spines ; ventral plate with a large medi- 

 oapical, bowl-shaped depression, the concave side facing 

 down and the lateral, distal part of the plate with 

 slender bristles. 



Distribution: Neotropical: Allopogon dimidiatus 

 Curran (1935); heydenii Jaennicke (1867); necans 

 Wiedemann (1828); tessellatus Wiedemann (1828); 

 vittatus Wiedemann (1828) [ = annulitarsis Rondani 

 ( 1868 ) , gracilis Bigot ( 1878 ) , longiwngulatus Macquart 

 (1838)]; weyenierghi Wuip (1882). 



Genus Caenarolia Thomson 



Figuees 146, 162, 539, 1055, 1064, 1718, 1726, 1730 



Caenarolia Thomson, in Svenska fregatten Eugenies resa . . ., 

 vol. 2, pt. 12 (Diptera), p. 470, 1869. Type of genus: 

 Caenarolia longipennis Thomson 1869, by monotypy. 



Caenorolia Williston, Trans. Amer. Ent. Soc., vol. 18, p. 74, 

 1891, lapsus. 



Medium size to large flies which are bare, short 

 pilose, strongly suggestive of Diogmites Loew in gen- 

 eral appearance ; the abdomen is rather robust basally, 

 tapered posteriorly, the face apilose with a transverse 

 row of 3 or 4 pairs of bristles above the epistomal 

 margins. Related also to Allopogon Schiner. They 

 are to be distinguished only on the basis of the reduced 

 pulvilli of the middle and especially the posterior pair 

 of legs where the pulvilli typically consist of very short 

 stubs, and in no case are more than one-third the length 

 of the claw. Length 15 to 22 mm. including the antenna. 



Head, lateral aspect: The face is moderately prom- 

 inent, becoming nearly plane with the eye margin at 

 the antenna and gently and slightly produced below, 

 the whole barely convex. The eye is of moderate 

 length, strongly convex posteriorly as well as anteriorly 

 and a little more prominent below. The occiput is 

 moderately developed throughout its length, without 

 pile, but with a conspicuous row of numerous, stout 

 bristles placed some distance from the ocular margin 

 and doubled or trebled in the lower corner of the occi- 

 put. The proboscis is long and has a high, medial 

 ridge; from the dorsal view it is slightly swollen to- 

 wards the base ; the apex is bluntly roimded only on the 

 dorsal margin and carries a few stiff hairs. The 



