DASYPOGONINAE 



ROBBER FLIES OF THE WORLD 



221 



below to at least half the head width. Although the 

 face is higher than in related genera, the eye is con- 

 spicuously developed below the face with deep, pocket- 

 like crease on each side. The surface of the face is 

 covered with coarse, reddish brown micropubescence ; 

 pile is absent, except for 2 or 3 bristly hairs on each 

 side immediately above the epistomal mystax. Mystax 

 composed of a curved, transverse row of 12 quite short, 

 stout, red bristles and above it 2 or 3 fine, equally short 

 black bristles. Subepistoma pubescent also. The 

 front is rather large, pollinose, and without pile. 

 Vertex but little excavated with large, low ocellar tu- 

 bercle which bears 2 short, fine bristles between the 

 ocelli, 2 other bristles which arise behind the ocelli. 

 The front and vertex are greatly narrowed in the 

 same ratio as the upper face. 



Thorax: The thorax is short and high with the 

 mesonotum convex. Mesonotum pollinose with short, 

 appressed, stout, acrostical setae and similar dorso- 

 central setae only differentiated posteriorly and which 

 remains quite short to the scutellum. Lateral bristles 

 short and stout. There are 3 notopleural, which are 

 red, 1 fine, black supraalar bristle, and 1 pair of quite 

 short, small bristles on the scutellar margin. Postalar 

 callosity with setae only. Scutellum flat with strong, 

 transverse grooves, and metanotum pollinose only. 

 The pleuron is pollinose with greatly reduced pile re- 

 stricted to the propleuron. Pronotum with 3 pairs of 

 slender bristles and other pile. Metapleuron with 4 

 quite slender bristles and 2 or 3 fine, short hairs. Post- 

 metacoxal area membranous; pronotum dissociated. 



Legs : All the legs are rather elongate, especially the 

 hind pair. They bear dense, appressed, fine setae on 

 all surfaces and bristles are very few, except on the 

 tibia and tarsi. Hind femur with a weak, short bristle 

 dorsomedially near the apex, another ventrolaterally 

 at the apex, sometimes absent. Hind tibia long and 

 slender, with 3 quite short bristles dorsolaterally, 4 still 

 shorter dorsomedially, and 2 equally short ventral bris- 

 tles. Apex with 1 dorsal, 1 lateral, 1 long medial and 

 2 short medial, and 4 ventral bristles. Hind basitarsus 

 longer than the succeeding segments. Middle femur 

 and anterior femur without bristles. Middle tibia with 

 2 short, basal anterodorsal bristles, another in the mid- 

 dle, 2 longer bristles beyond ; it has 3 minute postero- 

 ventral bristles and on the distal half ventrally there 

 are 3 conspicuous, stout, attenuate, long, oblique bristles. 

 Anterior tibia with near the base 2 minute, anterodorsal 

 bristles, 4 similar posterodorsal bristles, and 2 long, 

 distoventral bristles. Apex without spine but with very 

 long anterior bristles. The anterior and middle basi- 

 tarsi each nearly as long as the 4 succeeding segments. 

 The claws are quite sharp, curved from the base, rather 

 attenuate but stout at base; the pul villus is long; the 

 empodium long and bladelike with swollen base. 



"Wings: The wings are broad and rather deeply 

 tinged with sepia brown ; marginal cell widely open ; all 

 posterior cells widely open; the anal cell is closed in the 

 margin. The posterior crossvein wanting, the anterior 

 crossvein enters the discal cell a little beyond the middle 



and the third vein forks distinctly beyond the end of the 

 discal cell. Alula small ; ambient vein complete. The 

 whole wing is villose. 



Abdomen: The abdomen is elongate, comparatively 

 slender, the first segment, however, nearly as wide as 

 the mesonotum. It bears fine, appressed setae and only 

 2 or 3 long hairs on the sides of the first and second 

 segments. First segment with 5 slender bristles lat- 

 erally; the abdomen is narrowest at the end of the 

 third segment and widest at the middle of the fifth 

 segment. Eight segments in the female, the eighth 

 nearly as long as the seventh, and the seventh almost as 

 long as the sixth. Female terminalia with acantho- 

 phorites and 5 pail's of long, blunt, spoon-shaped spines. 

 Eighth sternite with subcircular, depressed, postero- 

 medial plate and a deep cleft. 



Cystoprosopa sepia, new species 



Length 16 mm. Female. Head: The exceptionally 

 tumid occiput, the vertex, front, face and antenna are 

 rather light reddish brown. The interocellar space of 

 the small ocellar tubercle is blackish and the short, 

 blunt, spoon-shaped microsegment and the extreme apex 

 of the third antennal segment is likewise black. Pro- 

 boscis short, not extending beyond the face; it is ob- 

 liquely truncate at the apex, rather stout through the 

 middle and reddish brown in color. Palpus of two seg- 

 ments, dark reddish brown and almost black below. 

 The apex is attenuate, without bristles, although short, 

 slender, weak, bristly hairs begin on all sides a short 

 distance back from the apex ; these are few and are dark 

 brown. The occiput has scattered, reddish brown, 

 bristly hairs over the middle, stiff pile below, and all of 

 it scanty and at the top on the more swollen part there 

 is a row of rather stout but short, light red bristles with 

 a second, irregular row behind. Ocellarium with a pair 

 of small, divergent, blackish bristles arising between 

 the ocelli and widely separated and a pair of closely 

 adjacent, similar bristles arising behind the ocelli. 

 Front without pile or bristles; the micropubescence 

 minute. Face strongly inflated and convex and without 

 pile, except for 2 or 3 small, bristly setae lying in the 

 middle above the ventromarginal row of bristles. On 

 the ventral margin of the face on each side there is a 

 circular, single row of 6 or 7 short, conspicuous, light 

 red, rather stout bristles ; above these there is a patch 

 of 2 or 3 smaller, black bristles on each side. 



The antenna is elongate, perhaps a little longer than 

 the head and the first two segments comparatively slen- 

 der and more yellowish than the third segment, which 

 tends to be light red. First segment a little longer 

 than the second and both bear rather numerous, long, 

 black setae dorsally. Sides of first segment with 10 or 

 12 rather long, slender, sharp, black bristles ; the ven- 

 tromedial surface has black setae. Sides and apex of 

 second segment with moderately long, black, bristly 

 hairs and setae. Third segment dorsally with about 15 

 conspicuous, black, short bristles or setae. 



Thorax : Thorax for the most part quite dark reddish 

 brown. Down the middle of the mesonotum is an 



