ROBBER FLIES OF THE WORLD 



591 



longer hairs sublaterally on the second tergite and sides 

 of the first. Sternal pile short setate and appressed. 

 The tergite and sternites bear stout, prominent bristles. 

 The first two tergites each bear 3 pairs; the third to 

 seventh tergites have 2 or 3 pairs of stout bristles and 

 additional setae across the middle of the posterior bor- 

 ders. The sternal bristles are subpostmarginal, 2 pairs 

 on each side of each sternite. Eight tergites in males, 

 tlie eighth quite short. Seven tergites present in the 

 female, the eighth included in the ovipositor. In the 

 male terminalia the superior forceps are rather large 

 and elongate, swollen with notched apex, closely ap- 

 posed at apex, without dorsal space and tending to close 

 off the genital cavity below. Gonopod half as long as 

 upper forceps, and also directed straight backward. 

 Hypandrium short but longer than the eighth stemite. 

 Proctiger quite long, protruded and erect. Female ter- 

 minalia elongate, strongly attenuate from the rather 

 swollen subquadrate base and moderately compressed 

 laterally on the upper portion. No spines are present, 

 except a few, minute, very short elements ventrally 

 below the apex. 



Distribution: Nearctic: N eomochtkerus angustipen- 

 nis Hine (1909) ; gracilis Wiedemann (1828) [—aura- 

 tus Johnson (1895)]; lafipennis Hine (1909). 



Neotropical: Neomochthent.s fuliginosa Bellardi 

 (1861) ; nigrostriata Engel (1930) ; rufipalpis Mac- 

 quart (1838); truquii Bellardi (1861) [—pleheius 

 Osten Sacken (1887), taeniata Bellardi (1861)]. 



Palaearctic: Neomochtherus aegyptius Macquart 

 (1838); albicans Loew (1849); arabicus Macquart 

 (1838) ; candidus Becker (1923) ; chjpeatus Becker 

 (1915) ; eulabes Loew (1870) ; farinosus Loew (1870) ; 

 ilavicoi'nis Kuthe (1831) \^=olivierii Macquart 

 (1838)]; -flavipes Meigen (1820) i=siculus Macquart 

 (1834)] ; /)/,5c«/(37?7.o?'ate Macquart (1838) ; [ = striafipes 

 Loew (1849)]; grandicoUh Becker (1913); haiiseri 

 Engel (1927) ; lepida Loew (1871) ; longitudinalis 

 Loew (1856) ; malarias Gerstaecker (1861) ; mundus 

 Loew (1849) [= ?anaZis Macquart (1838)]; ochriven- 

 ^r?» Loew (1854) \^ = carthaginis ^eckev (1915), 27?ws- 

 tris Shiner (1867)]; fallens Pallas in Wiedemann 

 (1818) ; pallipes Meigen (1820) [=fuh)i.pes Meigen 

 (1820), longipennis Megerle in literature in Meigen, 

 omissa Wiedemann (1820), yanthopus Megerle in lit- 

 erature in Meigen] ; penicissxhs Becker (1923) ; per- 

 plexus Becker (1923) ; schineri Egger (1855) ; sehista- 

 ceus Becker (1908); tricuspidatus Engel (1927); tri- 

 dentatus Tiioew (1871). 



Ethiopian: Neomochtherus annulitarsis Loew 

 (1857) ; deserticola Karsch (1887) ; madagascarensis 

 Bromley (1942) ; monohia Speiser (1910) ; natalensis 

 Ricardo (1919) ; neavei Ricardo (1919) ; sinuata Loew 

 (1857) ; unctus Oldroyd (1939). 



Oriental: Neomochtherus congedus Walker (1951) ; 

 gnava Wulp (1872) ; indianus Ricardo (1919) ; lautus 

 Wulp (1872); patmelis Wulp (1872); striatus Wulp 

 (1892) ; trisignata Ricardo (1922). 



A.VL&iTa.\\?in: Neomochtherus rutilans Wulp (1898). 

 Country unknown : N eoirvochtlierua mellem Macquart 

 (1838). 



Genus Orophotus Becker 



FiGUBES 3.50, 792, 1543, 1553, 2288, 2319, 2418, 2503 



Orophotus Becker, Ent. Mitt., voL 14, p. 137, 1925. Type of 

 genus: Orophotus univittatus Becker, 1925, by monotypy. 



Large flies with exceptionally narrow face and vertex. 

 The third antennal segment is exceptionally slender and 

 attenuate. Male terminalia quite large and much more 

 like that of Cinadus Wulp, both m its composition and 

 external pattern, than that of OUgoschema Becker. 

 Sternal bristles generally reduced, especially on the 

 last sternites; an isolated tuft of strong bristles may 

 sometimes be fomid on the middle stemite. Tei-gal 

 bristles follow the pattern of the sternal bristles. How- 

 ever, there is a group which, like Orophotus manda- 

 rinus Bromley, have the long, slender, tliird antennal 

 segment of this genus but have the abdominal segment, 

 both sternites and tergites, equipped with remarkably 

 exaggerated, long, curved, almost spikelike bristles, and 

 in which respect they parallel the subgenus Chaetogo- 

 mophora, new subgenus of Cinadus Wulp. Length 

 28 mm. 



Head, lateral aspect: The face is not produced or 

 visible on the upper third but is moderately protuber- 

 ant below, with the anterior profile nearly plane. The 

 epistoma is produced distinctly below the eyes. Eyes 

 slightly more narrow below but with scarcely any reces- 

 sion ; they are strongly convex anteriorly and distinctly 

 plane over most of its posterior profile. The occiput is 

 moderately swollen above the middle but obliterated 

 at vertex, slightly sunken and concave across the 

 middle, and a little more protuberant below ; occipital 

 pile scanty, long, and stiff with on the upper third a 

 few, weak bristles consisting of 3 paire of pale bristles 

 and above them 3 pairs of somewhat stiffer, black 

 bristles, to which may be sometimes added 3 or 4 others 

 on the postmedial slope of the vertex. The proboscis 

 is cylindrical, very slightly swollen at the base, the 

 apex gently tapered above and below and bearing a 

 few, stiff hairs; also a few, long, stiff bail's at the base; 

 dorsal ridge absent; direction obliquely downward. 

 Palpus of one segment, but with a slight trace of a 

 fused basal segment ; they are elongate, slender, cylin- 

 drical, with 3 stout bristles laterally and 1 extremely 

 long, apical bristle besides other stiff, bristly hairs. 

 The antenna is attached at the upper third of head and 

 slender; the first segment is 11/4 times as long as the 

 second. The third segment is unusually slender and, 

 with the microsegment included, is nearly as long as 

 the first two segments combined. Microsegment three 

 times as long as wide; the style is as long as the first 

 two antennal segments ; basally it is equal in thickness 

 to the microsegment and bears a minute spine at apex. 

 First anteimal segment with a dense patch of appressed 

 setae dorsally on the outer half and others below reach- 



