524 



■UNITED STATES NATIONAL MtTSEUM BULLETIN 224 



Stout, dorsocentral bristles with 3 or 4 similar elements 

 posteriorly. Himierus poUinose but apilose. Lateral 

 bristles quite exceptionally long and stout and consist 

 of 3 notopleui-al, 2 supraalar, 1 postalar, and 2 pairs 

 of very stout scutellar bristles with 1 or 2 pairs of addi- 

 tional bristles set marginally on the convex portion 

 which overlies the distinct impressed rim; remainder 

 of lower rim and the sides of the disc with a tuft of 

 long, coai-se, bristly pile. Scutellum thick, convex, 

 with impressed rim. Propleuron with abundant, long, 

 coarse pile: pronotum with 4 or 5 stout, long bristles; 

 posterodorsal pronotum with coarse pile only. Poste- 

 rior and anterior upper comers of the mesopleuron, 

 the anterior and posterodorsal stemopleuron with a 

 tuft of stiff hairs. Pteropleuron with 4 or 5 long, 

 bristly hairs and 7 or 8 shorter elements. Posthypo- 

 pleuron with 2 exceptionally long, stout, pale bristles 

 and other bristly hairs. Metapleuron with a vertical 

 row of G or 7 long, stout bristles. Lateral slopes of the 

 metanotmn bullose, not creased and pubescent only. 

 Lateral and ventral metastemum with moderately 

 abundant, stiff pile; postmetacoxal area membranous; 

 tegula with setae; posterior basalare with 3 or 4 short, 

 pale bristles or bristly hairs ventraUy; squama with 

 multiple fringe. 



Legs: The hind femur slightly thickened; the an- 

 terior and middle femora are distinctly swollen, espe- 

 cially along the middle. All the femora have rather 

 short, coarse, oppressed, pale pile: ventral surface of 

 the hind femur with moderately abundant, fine, erect 

 hairs on the medial half only. The hmd femur bears 

 4 long, dorsolateral bristles, a fifth bristle at the apex 

 and the submedial element with an additional, dorsal 

 and dorsomedial counterpart; ventrally there are 4 

 shorter, stout bristles; medial margin with 2 or 3 

 slender bristles, ventral margin with about 10 long, 

 bristly hairs. Hind tibia with exceptionally promi- 

 nent, "stout, long bristles ; 4 dorsomedial, 4 dorsolateral, 

 1 lateral near the base, 3 ventrolateral ; the apex with 1 

 dorsolateral, 1 lateral, 1 ventrolateral, 3 ventral, 1 

 medial, and 1 dorsomedial. Middle femur with 3 an- 

 terior, besides at the apex 2 or 3 slender bristles an- 

 teriorly and 2 posterodorsally : also 4 or 5 anteroventral 

 bristles. Middle tibia with 3 anterodorsal bristles, 4 

 posterodorsal, 2 longer stout posteroventral on the 

 outer half. Anterior femur with 1 anterior in the mid- 

 dle which may be absent, 2 or 3 rather slender dorsal 

 in the middle which may be increased to 5 or more 

 and the anterior tibia has rather shorter bristles 

 consisting of 7 anterodorsal, 6 posterodorsal, but 2 ex- 

 ceptionally long, basally stout posteroventral bristles 

 before and after the middle and with long, bristly pile 

 posteriorly and posteroventrally. 



Middle coxa dorsolaterally with 1 exceptionally long, 

 very stout, black bristle, or with 2 or 3 pale bristles. 

 Hind coxa with 2 or 3 weak bristles, the trochanters 

 tend to have at least 1 very stout bristle. Anterior coxa 

 with a dense brush of bristly pile and about 10 slender 

 bristles. The tarsi and basitarsi are moderately elon- 



gate and slender. Tarei end in sharp claws, long, spatu- 

 late pulvilli and long, slender empodiiun. 



Wings : The marginal cell is closed with a short stalk; 

 subcostal cell naiTOw, wing not expanded; the anterior 

 branch of the third vein is sinuous, ending well above 

 the apex and not a great distance from the end of the 

 subcostal cell; the posterior branch ends far behind 

 the wing apex. First posterior cell closed with a long 

 stalk; base of second posterior cell exceptionally ex- 

 panded anteriorly being nearly 2V2 times the distal 

 width of the discal cell. Lower end Vein of the discal 

 cell drawn far back towards the base, not quite paral- 

 leling the wing margin. Fourth posterior cell closed 

 with a long stalk, slightly convex on aU sides. Second 

 basal cell ends in 3 veins, the middle vein almost elimi- 

 nated. Alula large, ambient vein complete; the anal 

 cell closed and stalked. 



Abdomen : The abdomen is subcylindrical, distmctly 

 tapered, the sides of the first tergite moderately pro- 

 tuberant. Pile of the abdomen comparatively abun- 

 dant, coarse, moderately long, tending to be flat ap- 

 pressed but erect on the first two tergites and more or 

 less erect laterally. Sides of first tergite with 5 or 6 

 bristles and the posterolateral margins of remaining ter- 

 gites with vei-y distinct bristles ; middle, lateral margin 

 of the second tergite tends to have at least 2 bristles. 

 There are 2 or 3 bristles on the postmargins of the ter- 

 gites ; sternites near their posterior margins with several 

 distinct bristles. First stemite apilose. Eight tergites 

 in the male, the eighth a third as long as the seventh, 

 becoming shorter laterally. Female with eight tergites, 

 the eighth possibly incorporated with the ovipositor; 

 the ninth and tenth segments quite short ; the eighth is 

 convex dorsally ; the ninth stemite is rugose, compressed 

 ventrally with a long, medial fissure. Male terminalia 

 only moderately large, not rotate, the superior forceps 

 broad, rather flattened, with a blunt, apical process. 

 Gonopod short, obtuse and convex; hypandrium very 

 short ; aedeagus simple. 



Distribution: Ethiopian: Megadrillus elachipterus 

 Loew (1858) ; heteroneurus Macquart (1838). 



Country unknown: Megadrillus irevipennis Mac- 

 quart (1838). 



Genus Synolcus Loew 

 FiGUBES 3.54, 724, 1459, 1469, 2300, 2304 



Synolcus Loew, Ofvers. Svenska Vet.-Akad. Forhandl., vol. 14, 

 p. 361, 1858. Type of genus: Asilus duHus Macquart, 

 1846. Designated by Loew, 1860. 



Flies of medimn size and dark color. Like all mem- 

 bers of the N eolophonotus Engel group the metanotal 

 callosities are without pile. The face has no gibbosity 

 but is very slightly arched beginning below the antenna 

 and continued to the epistoma. There are a few, long, 

 strong bristles on the upper face and several pairs of 

 quite stout, long elements in a row above the epistoma. 

 Lower occiput well developed. Third antennal seg- 

 ment several times longer than wide, with microseg- 

 ment and short style. Most of these characters separate 



