216 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



PART 1 



ties or specialized posterior pile. All pile minute, short, 

 subappressed, pale. The tergites are greyish yellow 

 micropollinose with narrow, reddish brown posterior 

 borders. In males seven tergites are visible. Male 

 terminalia conspicuous. The epandrium is not split or 

 cleft but has a medial, downwardly directed prong, is 

 laterally flattened and spatulate and also bears pale, 

 downwardly directed hairs. No females were seen. 



Distribution : Ethiopian: Lycostomus albifacies 

 Hermann (1907). 



Genus Ancylorrhynchus Latreille 



Figures 100, 534, 1111, 1120, 1785, 1822, 1823 



Ancylorrhynchus Latreille, Families naturelles du regne 



animal, Paris, p. 490, 1825. Type of genus : Asilus glaucius 



Rossi, 1790, by monotypy. 

 Xiphocera Maequart, Histoire naturelle inseetes, dipteres, vol. 1, 



p. 279, 1834. Type of genus: Xiphocera percheronii 



Maequart, 1834, by monotypy. 

 Elasmocera Rondani, Ann. Acead. Aspiranti Nat. Napoli, vol. 3, 



p. 153, 1845. Type of genus: Elasmocera cingulata 



Rondani, 1845, by monotypy. 

 Opegiocera Rondani, Ann. Accad. Aspiranti Nat. Napoli, vol. 3, 



p. 153, 1845, nomen nudum. 

 Xiphocerus Loew, Linnaea Entomologica, vol. 2, p. 470, 1847, 



lapsus. 

 Enchocera Blanchard, Histoire naturelle des inseetes, vol. 3, 



p. 579, 1840. 



Flies with mostly short pile, which are comparatively 

 bare and without pollen. They have a rather robust, 

 cylindroid abdomen, a generalized whig in which all 

 cells are open and an unusually elongate, slender an- 

 tenna. Females have acanthophorites, which bear 

 spines and the lateral processes have bristles. These 

 flies are readily recognized by the not excavated front 

 and the curious, characteristic, short, bulbous and re- 

 trorse proboscis. They appear to have no close rela- 

 tives, but perhaps come near Scylaticus Loew. Length 

 15 to 20 mm. 



Head, lateral aspect: The face is rather moderately 

 produced, with a nearly straight or very slightly convex 

 profile. The eye is equally prominent above and below, 

 without recession but longer medially and somewhat 

 flattened anteriorly. The occiput is unusually stout 

 and prominent, especially at the vertex ; its pile consists 

 of a dense, wide, dorsal band which is somewhat more 

 narrow across the middle of the occiput and less exten- 

 sive below. Bristles are absent ; the pile is stiff. The 

 proboscis is short, exceptionally swollen at the base, 

 with a blunt apex directed backward so that in anterior 

 profile the proboscis is greatly curved and convex ; the 

 apex bears short, stiff pile, the base behind on the 

 swollen part bears numerous, stiff, bristly hairs. Pal- 

 pus large, the second segment swollen, with nearly closed 

 pore at apex. The first segment is excavated; the 

 second segment has numerous, long, stiff bristles on all 

 sides except the middle. The antenna is located at 

 the upper fourth of the head and is exceptionally long, 

 being nearly twice as long as the head. The first seg- 

 ment is stout, three or more times as long as the very 



short, beadlike, second segment. The third segment is 

 four times as long as the first two segments together 

 and strongly compressed laterally; it is only a little 

 wider towards the middle, gently tapered at the apex, 

 and ends in an oblique, oval, rather small opening which 

 contains a minute spine. First segment with a few 

 setae dorsally and longer setae laterally at the base and 

 in the middle with 2 or 3 moderately stout, long bristles. 

 Head, anterior aspect: The height of the head is 

 five-sevenths of the width. The face below the antenna 

 is about a third of the head width, with nearly parallel 

 sides. Subepistomal area short, nearly horizontal or 

 slightly oblique, shallowly concave and bare. The face 

 is micropubescent but pollinose only on the lateral 

 epistomal margin. Beginning just below the antenna 

 the face bears very dense, abundant, rather long, stiff, 

 bristly pile which is longer and more abundant below 

 and directed obliquely downward. The front is 

 slightly divergent and continued in the same way on 

 up to the vertex. The sides of the front have 

 numerous, long stiff hairs and a submedial patch of 

 hairs. Vertex without excavation, the ocellarium large, 

 with vertical sides extended backward as a convex, 

 marginally creased ridge; the ocelli are swollen; the 

 middle bears 6 or more coarse hairs on each side. 

 Central eye facets slightly enlarged. 



Thorax : The mesonotum with pollen only medially 

 on the humerus and laterally on the notopleural area. 

 Pleuron with dustlike pollen. Pile of mesonotum fine, 

 erect and scanty. Humerus pilose, with 6 or 7 weak 

 bristles ant erovent rally. The lateral bristles of the 

 mesonotum are moderately stout and long and consist of 

 2 notopleural, 2 supraalar, 3 postalar, and 8 pairs of 

 scutellar bristles. Some long, prescutellar pile is pres- 

 ent. Propleuron with rather scattered, long pile. 

 Anterior collar with 7 or 8 pairs of weak bristles; 

 mesopleuron and upper sternopleuron and the ptero- 

 pleuron with some fine, scattered pile. Upper ptero- 

 pleuron with 3 or 4 bristles; metapleuron with ventral, 

 stout, long bristles and more numerous, slender bristles 

 above. Metanotal slopes without pile or bristles. 

 Metasternal slopes and the metasternum with fine, long 

 pile. Postmetacoxal area membranous. Hypopleuron 

 with a patch spot of pubescence. Posterior basalare 

 with a tuft of 7 or 8 long bristles, 3 or 4 of these are 

 stout. Prosternum dissociated. 



Legs: The anterior 4 femora are stout but not 

 thickened. Hind femur and its tibia elongate; this 

 femur is slightly widened distally ; it bears appressed, 

 dorsal and lateral pile, no apical bristles, 1 dorsolateral 

 at the outer fifth, 6 or 7 lateral, 12 to 14 ventral, in- 

 cluding 2 at the apex, and 6 to 8 ventromedial bristles. 

 The hind tibia bears 8 dorsal, 6 lateral, 6 ventrolateral 

 bristles, and its apex has only 8 to 10 bristles. There is 

 a brush of setae present, extending on to the first two 

 tarsal segments. Middle femur with 5 anterior, 1 an- 

 terodorsal at the outer third, 1 posterior near the apex, 

 and some 15 sharp, slender, ventral bristles. Its elon- 

 gate tibia bears 8 dorsal, 5 or 6 anterodorsal, 10 to 12 pos- 

 terior, 6 to 8 posteroventral, and 4 or 5 ventral bristles. 



