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UNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



beadlike. The third segment is two times the combined 

 length of the first two segments; it is elongate, slightly 

 attenuate apically, rather strongly compressed laterally 

 on the basal half, and obliquely truncate, with a short, 

 obtuse, microsegment carrying an apical spine. 



Head, anterior aspect : The head is a little wider than 

 high. The face below antenna is about one-fifth the 

 head width and divergent below to one-half the width. 

 Subepistomal area comparatively small, slightly 

 oblique. Entire face, except the steep sides of the 

 protuberance, covered with quite long and quite stout 

 bristles. Front moderately divergent, compared to the 

 width of the upper face: the vertex is slightly con- 

 vergent. The lateral margins of the front have a row 

 of 10 bristles as long as those of the upper occiput. 

 Vertex scarcely or not at all excavated ; the ocellarium 

 large but low, bearing 2 pairs of stout, long bristles 

 across the middle and 2 or 3 pairs behind the ocelli 

 which are rather strongly proclinate. All upper oc- 

 cipital bristles rather strongly proclinate. Anterior 

 eye facets only moderately enlarged. 



Thorax: The thorax is polished and bare, or with 

 extremely sparse micropubescence which does not ob- 

 scure the metallic ground color. There is present a 

 double aerostical row of fine bristles; the dorsocentral 

 bristles are developed throughout the full length of the 

 thorax but become longer and stouter on the posterior 

 half of the mesonotum. Humerus with 5 or 6 bristles 

 and bristly hairs; notopleuron with 1 bristle and 10 or 

 15 bristly hairs; supraalar, postalar, and scutellar mar- 

 gin with several stout bristly hairs. Slopes of the me- 

 tanotum micropubescent only. Scutellum thick and 

 convex. Pronotum, propleuron and upper sternopleu- 

 ron with stout, bristly hairs: mesopleuron, metapleu- 

 ron, and lateral metasternum bare; postmetacoxal area 

 small and membranous; prosternum dissociated. 



Legs: The hind femur with slender bristles which 

 consist of 8 lateral and an oblique row of 3 or 4 short 

 lateral bristles at the apex, a similar row medially at 

 the apex, besides 8 or 10 ventrolateral of varying 

 length, 7 or 8 very short ventromedial, together with 2 

 or 3 long medial bristles near the middle and with 2 

 long, slender bristles ventrally on the basal third. 

 Hind tibia as long as the femur, gradually thickened 

 distally. The apex of the hind femur bears 2 lateral, 4 

 medial, and 4 ventral bristles. Hind basitarsus quite 

 stout, the second segment also stout : the first segment 

 is nearly as long as the remaining 4 segments. Middle 

 femur with 7 or 8 anterodorsal, 5 or 6 anterior, 5 or G 

 stout anteroventral, and 8 long, stout, posteroventral 

 bristles. Middle tibia with long, stout bristles, 8 ante- 

 rodorsal, 8 posterodorsal, 6 posteroventral, and 2 ven- 

 tral bristles confined to the outer half, besides 4 an- 

 teroventral on the outer half. Anterior femur with 5 

 stout anterior bristles on the outer half, besides an addi- 

 tional vertical band at the apex of 4 or 5 bristles. This 

 femur has 6 to 8 dorsal and 5 or 6 posterodorsal bristles. 

 Anterior tibia with long, sharp, dorsal bristles consist- 

 ing of 5 or 6 anterodorsal and 7 or 8 posterodorsal, also 

 6 posteroventral and 3 ventral. Apex of this tibia 



without spine: the anterior basitarsus stout and rather 

 short but nearly as long as the succeeding three seg- 

 ments, each of which are quite short. All tarsi end in 

 stout, sharp claws, well developed pulvilli and a short 

 empodium strongly swollen at the base. 



Wings : The wings are deeply and uniformly tinged 

 with black. All cells open except the fourth posterior 

 cell, which is closed with a short stalk; the third vein 

 forks far beyond the end of the discal cell ; middle end 

 vein of the second basal cell is short. Alula well de- 

 veloped but not deep : ambient vein complete. 



Abdomen: The abdomen is comparatively robust 

 basally and moderately long and tapered. The pile 

 consists of appressed setae or short, stiff hairs in the 

 middles of the tergites and longer, scattered stiff hairs 

 along the lateral margins. The pile is longer on the 

 first two segments but there are no bristles. Males with 

 seven tergites and a very narrow liplike protrusion of 

 the eighth. Females with eight tergites, with the eighth 

 at least half as long as the seventh. Male terminalia 

 small, short, and not rotate. The epandrium is fully 

 cleft, slightly divergent, each apex obtuse, and with 

 a large, oblique proctiger lying between and projecting 

 above. The gonopod is moderately prominent but 

 shorter. The hypandrium if present is quite short and 

 recessed beneath the short eighth sternite. Females 

 with acanthophorites and 6 pairs of moderately long 

 spines. 



Distribution: Ethiopian: Teratopus cyaneus Fabri- 

 cius (1781). 



Genus Archilestris Loew 

 Figures 118, 151, 473, 1015, 1024, 1826, 1851 



Archilestes Schiner, Verb, zool.-bot. Ges. Wien, vol. 16, p. 672, 

 1866. Type of genus : Dasypogon capnoptera Wiedemann, 

 1828: designated by Coquillett, 1910. Preoccupied, Neu- 

 roptera, 1862. 



Archilestris Loew, Berliner Ent. Zeitschr., vol. 18, p. 377, 1874. 

 Change of name. 



Pseudonrcliilrstes Bigot, Ann. Soc. Ent. France, ser. 6, vol. 9, 

 Bull., p. 183, 1889. Unnecessary change of name. 



Pseudoarchilestes Bigot, Wiener Ent. Zeitung, vol. 9, p. 96, 1890, 

 lapsus. 



Large or very large flies of sombre coloration, ex- 

 ceptionally long legs, apilose face on which the bristles 

 are restricted to a single row of stout, long elements 

 above the epistoma. The antenna is elongate, especially 

 the third segment which bears stout, dorsal bristles 

 and short fused microsegment. The pile is greatly re- 

 duced, leaving a bare aspect. The tarsal segments are 

 rather shortened. Length 22 to 40 mm. 



Head, lateral aspect : The head is of moderate length, 

 the face well developed, though never produced or 

 gibbous, it gradually becomes a little more extensive 

 below and its surface is not quite plane, being very 

 slightly convex. The occiput is poorly developed 

 throughout ; its pile is distinctly coarse and bristly be- 

 low and abundant, but near the ventral fifth it changes 

 to a single row of rather long, stout bristles which are 



