ASILINAE 



ROBBER FLIES OF THE WORLD 



521 



ginal and submargiiial cells are strongly rippled. The 

 second submarginal cell takes origin quite at the end 

 of the discal cell, and at its base, entirely above the 

 third vein; this cell is undulate along the middle, the 

 2 branches of the third vein end an equal distance above 

 and below the wing apex. Anterior crossvein slightly 

 oblique and enters the discal cell at or before the middle. 

 The lower end vein of the discal cell is not long but is 

 strongly drawn baclcward; second posterior cell very 

 little widened at the base. The fourth posterior cell 

 is closed with a long stalk, its anterior border is ex- 

 ceptionally convex and occludes the discal cell ; the sec- 

 ond basal cell ends in 2 vehis fused beyond. Anal cell 

 closed and stalked. Alula wide; ambient vein com- 

 plete. There is an indention at the end of the anal 

 cell. 



Abdomen : The abdomen is subcylindrical and a little 

 flattened on the first two tergites; the first tergit© is 

 about a third as long as second and has a subbasal de- 

 pression ; each wing of the depression is slightly oblique 

 and joins a medial depression. The sides of this tergite 

 are a little protuberant and bear very sparse, fine pile. 

 There is a posterior row of 3 quite strong, reddish bris- 

 tles. The subposterior margins laterally on the second 

 tergite have a row of widely spaced, very strong, quite 

 long, appressed, reddish yellow bristles which extend 

 well on to the next segment and cover at least the outer 

 third. The third and fourth tergites each with 4 bris- 

 tles ; the fifth to eighth tergites each have 1 or 2 some- 

 what shorter, weaker bristles. Sternites without bris- 

 tles. The male terminalia are large and conspicuous and 

 not rotate. The superior forceps and gonopod tend to 

 be tilted upward and more or less divergent. The hy- 

 pandrium is large. Proctiger large, oval, flat, protrud- 

 ing only a little way above the superior forceps. 

 Female terminalia as long as or longer than the preced- 

 ing two segments and quite strongly compressed 

 laterally, especially on the apical half. 



Distribution: Neotropical: Nyssoprosopa pollinosa, 

 new species. 



IS'yssoprosopa pollinosa, new species 



Length 16 mm. Male, female. Head: The face is 

 densely brownish yellow pollinose ; mystax light brown- 

 ish yellow except a group of 4 hairs in the lower middle 

 face and 2 lateral pairs also above the lower anterior 

 edge of face. Front and occiput also densely pale, 

 brownish yellow pollinose. Ocellarium with 3 or 4 

 quite short, minute, black bristles behind the posterior 

 ocellus ; anterior ocellus directed to the front. Anterior 

 eye facets strongly enlarged with a sharp, impressed 

 line of division curving from the sides of the front 

 downward to the middle of the eye. Upper occiput 

 with 10 to 12 moderately stout, rather short yellow 

 bristles; the bristles of the lower part of occiput are 

 rather strongly curved downward. All occipital pile 

 pale yellow. The second segment and base of third 



535914 — 62— pt. 2 7 



segment is light reddish brown, the style light brown; 

 all antemial pile black. 



Thorax: The anterior half of mesonotum and the 

 humerus are golden brown pollinose; the lateral post- 

 mesonotum rather light ochreous pollinose and the mid- 

 dle of mesonotum with an almost black, pollinose, me- 

 dial vitta, strikingly contrasted and, if viewed anteri- 

 orly, almost divided by golden brown pollen, which be- 

 comes of wider proportions anteriorly; pleuron also 

 pale brownish ochreous pollinose. Pronotum with 2 

 pairs of moderately stout, long, yellow bristles ; meta- 

 notal slopes without pile or bristles but covered with 

 pollen. Disc of scutellum with 40 to 50 short, erect, 

 yellow setae. 



Legs: The femora and tibiae and all tarsi, except 

 last segment, rather light reddish to yellowish brown; 

 the tibiae more yellow brown, the femora more reddish; 

 last tarsal segment with apical half dark reddish 

 brown; all coxae pale ochre pollinose with brownish 

 yellow bristles. Legs with black setae on the hind 

 femora on all sides, and with black, tuberculate bristles ; 

 the last dorsal bristle at the apex and 1 bristle at the 

 base may be yellow ; bristles of hind tibia chiefly black 

 but there are 2 weak, dorsal, yellow bristles beyond the 

 middle. Middle femur with the bristles black except 

 the ventral margin, where on the basal half are 9 or 10 

 exceptionally long, straight, erect, slender, golden 

 bristles. 



Wings : The marginal and submarginal cells strongly 

 rippled ; marginal cell expanded at the expense of the 

 subcostal cell. 



Abdomen : The sides of the first tergite with 3 strong, 

 posterior, reddish bristles ; second tergite with a row of 

 widely spaced, long, appressed, reddish bristles extend- 

 ing well onto the next segment. Tliird and fourth ter- 

 gites bear 4 such bristles, the fifth to eightli each have 

 1 or 2 similar bristles ; sternites without bristles. 



Type. Male; allotype female, from Paraguay, col- 

 lected by Fiebrig. Types in the Zoologische Staats- 

 sammlung, Munich, and studied through the kind per- 

 mission of the Director, Dr. Walter Forster. 



. Genus Hippomachus Engel 

 Figures 326, 723, 1455, 1465, 2179, 2273 



Trichonotus Loew, Ofvers. Svenska. Vet-Akad. Forhandl., vol, 

 14, p. 362, 365, 1858. Type of genus : Trichonotus pe/yasus 

 Loew, 1858, by mouotypy. Preoccupied Pisces, ISOl ; Co- 

 leoptera, 1842. 



Hippomachus Engel, Ann. Transvaal Mus., Pretoria, vol. 12, p. 

 148, 1927. Change of name. 



Medium size flies readily recognized by the high, an- 

 teriorly pinched mesonotum, which bears a dense, me- 

 dial mane, together with the extremely dense, vertical, 

 medial band of pile of two lengths upon the face. The 

 antemia is exceptionally slender, with a finely attenuate 



