DASYPOGONINAB 



ROBBER FLIES OF THE WORLD 



135 



sal aspect. The ventral surface is plane and the dorsal 

 surface is arched with a distinct keel. The ventral sur- 

 face on the basal half bears numerous, long, stiff hairs 

 and the apex with a tuft of fine hairs. Palpus clearly 

 of two segments, the first segment excavated, the second 

 robust, short, attenuate, with apical pore and many 

 bristles. The antenna is attached at the upper fourth 

 of the head and elongate but comparatively shorter 

 than in Dizonias. The first segment is a little longer 

 than the second and each bears several rather long, 

 stout bristles ventrally besides more slender bristles 

 dorsally near the apex. The third segment is nearly 

 2y 2 times the length of the first two combined, slender, 

 very slightly and gradually widened distally, with the 

 apex having an oblique pit and short apical spine. 



Head, anterior aspect: The head is distinctly wider 

 than high, the eyes rather flattened anteriorly; the face 

 below the antenna is about one- fourth the head width 

 and moderately divergent below. It is coarsely pubes- 

 cent and bears only numerous, rather long, curved, 

 moderately stout bristles over the whole of the extended 

 portion. Laterally they do not extend to the eye mar- 

 gin, and are generally both pale and dark. The front 

 is comparatively short, broad, wider than the face, 

 pollinose, with unusually prominent, numerous bristles 

 laterally in several rows along the eye margin, and 

 anteriorly a patch of short setae or bristles on either 

 side of the midline. The vertex is very little excavated, 

 slightly narrowed, with long bristles laterally beside 

 the eye constituting an extension from the front; the 

 large low ocellarium bears 1 pair of bristles between the 

 ocelli, 2 stouter pairs between the posterior ocelli, and 

 2 or 3 other stout pairs posteriorly. The subepistomal 

 area is large and oblique. 



Thorax: The mesonotum is of moderate height and 

 barely convex. It bears scattered, rather long, slender 

 bristles or setae, with a differentiated double row of 

 similar acrostical elements; and the dorsocentral ele- 

 ments are differentiated only by length, beginning be- 

 hind the humeri, and form 3 rather long pairs posteri- 

 orly. Humerus with 8 to 10 rather stout bristles. The 

 lateral complement of bristles contains 2 or 3 post- 

 humeral, an oblique row of 4 very stout, conspicuous 

 notopleural, 3 supraalar, 2 suprapostalar, 6 or 7 post- 

 alar, and 3 pairs of scutellar bristly hairs. Pronotal col- 

 lar with 15 pairs of bristles and 10 to 12 additional 

 bristles on the lateral pronotum, all of them stout. 

 Upper and posterior mesopleuron with bristly pile, the 

 pteropleuron with a stout bristle and other pile. An- 

 terior basalare with stiff pile. Upper sternopleuron 

 with numerous bristly hairs and the metapleuron with 

 a vertical band of numerous long, stiff bristles. Meta- 

 notum pollinose only. Metastemum pilose, the post- 

 metacoxal area membranous, the prosternum com- 

 pletely dissociated. 



Legs : All the femora and tibiae stout and moderately 

 elongate but only the first four femora a little swollen. 

 The pile is scanty, fine, setate and subappressed, with a 

 scanty ventral fringe of lone, quite fine, erect bristly 

 pile on the lower surface of all of the femora and tibiae. 



Bristles are exceptionally numerous and stout. The 

 hind femur bears 6 lateral, a like number of ventro- 

 lateral, and distally 3 ventromedial bristles, besides 



1 distal medial bristle. Dorsally at the subapex there 

 is 1 stout bristle on either side and 3 at the apex 

 medially, 1 laterally. The hind tibia bears 3 dorso- 

 lateral, 4 dorsomedial, 4 ventrolateral and 2 distal ven- 

 tromedial bristles. The apex carries 9 bristles. Middle 

 femur bears 3 anterior, 3 anteroventral distal bristles, 

 5 postero ventral bristles and 2 or 3 posterodorsal 

 bristles near the apex. Middle tibia bears 6 anterodor- 

 sal, 7 posterodorsal, a like number of posterior bristles, 



2 postero ventral and 2 anteroventral bristles. The an- 

 terior femur carries 6 dorsal, 6 posterodorsal, 2 postero- 

 ventral, and at the apex 3 anterior bristles. All of the 

 bristles of this femur tend to be concentrated on the 

 outer half. The bristles of anterior tibia like all the 

 other are conspicuous and consist of 6 anterodorsal, 6 to 

 8 posterodorsal, 5 posterior, 2 posteroventral bristles. 

 Apex of anterior tibia without spine. The claws are 

 long, stout and sharp, the pulvilli well developed, and 

 the empodium bladelike. 



Wings: The marginal cell is narrowly open by about 

 half its maximal width. Only the fourth posterior cell 

 is closed and it has a very short stalk. Anal cell nar- 

 rowly open or closed at the margin ; the alula large, the 

 ambient vein complete. 



Abdomen: The abdomen is robust, a little flattened 

 across the tergites. The sides curled down strongly, 

 and the whole gently tapered. The pile is scanty, but 

 subappressed and setate, with a little longer bristly pile 

 on the sides of the first three tergites. The first ter- 

 gite bears laterally a cluster of about 10 moderately 

 stout bristles. Near the base of the second tergite lat- 

 erally is a cluster of 8 to 15 long, slender bristles. 

 Females with eight tergites, the last being nearly as 

 long as the seventh and all of them progressively and 

 slightlv reduced in length beyond the second tergite 

 which is longest. The acanthophorites each bear 5 

 stout, pointed spines; the last sternite is deeply cleft 

 in the middle. Male not seen. 



As I have not been able to leam that any of the 

 three original species were designated as type of genus, 

 I have designated Tohnerolestes pluto, the second 

 species, as type of genus. 



Distribution: Neotropical: Tolmerolestes brethesi 

 Gemignani (1936); fax Lynch Arribalzaga (1881); 

 pluto Lynch Arribalzaga (1881) ; ruhripes Lynch Arri- 

 balzaga (1881). 



Genus Cylicomera Lynch Arribalzaga 



Figukes 181, 478, 1034, 1043 



Cylicomera Lynch Arribiilzaga, Anal. Soe. Cient. Argentina, 

 vol. 11. p. 115, 1881. Type of genus: Cylicomera ruoro- 

 faxciata Lynch Arribalzaga, 1881, by present designation. 



Medium size and robust flies which are related to 

 Dizonias Loew and Tohnerolestes Lynch Arribalzaga. 

 They are distinguished by the much smaller, slender 



