ROBBER FLIES OF THE WORLD 



437 



base, cylindrical, bluntly pointed but not extending be- 

 yond the face. It extends obliquely forward and bears 

 a lateral, subapical crease. The antenna is similar to 

 Ommatius, the plumes of the style are disposed in 2 

 rows throughout the length of the style. 



Head, anterior aspect : The face is narrow, pubescent, 

 about a ninth the head width, and very little divergent 

 below. It bears some scattered, long pile, a double, 

 vertical row of long, slender, often black bristles, each 

 row containmg about 5 elements, and also slender 

 bristles above the imusually small subepistoma. Cheeks 

 absent in lateral aspect. The front is widened in the 

 middle, the vertex also deeply excavated. Postocellar 

 bristles stout, upper occipital bristles proclinate. 



Thorax : The thorax is similar to that of Ommatius ; 

 the scutellum is only moderately thick and convex with 

 impressed rim and a pair of long, stout bristles. Bristles 

 are long and stout and consist of : 2 notopleural, 2 post- 

 supraalar, 2 postalar, no humeral bristles. There are 

 an acrostical row of hairs, presutural dorsocentral hairs, 

 and postsutural dorsocentral bristles. Pteropleuron 

 with a long, conspicuous, stout bristle on the posterior 

 section but only shorter, bristly hairs anteriorly. Pro- 

 sternum fused with the posterolateral part narrowed; 

 metanotal callosity bare; postmetacoxal area with a 

 long, chitinous arch. Anterior basalare with a slender 

 bristle. 



Legs : All the femora are a little swollen ; the bristles 

 are prominent but attenuate, and sometimes tuberculate 

 at base. The hind femur bears a stout bristle laterally 

 on the apical and basal third; 1 bristle dorsolaterally 

 at the subapex; 8 ventrolaterally and sometimes 3 or 

 4 longer, slender bristles ventrally on the basal half, 

 and weak bristly hairs or slender bristles ventromedially 

 on the distal part. Ventral surface of hind femur 

 plane. Bristles of the legs otherwise similar to Om- 

 matius. The middle basitarsus is somewhat shorter 

 than in Om-matius. Claws and pulvilli similar to Om- 

 matius. 



Wings: The wings are quite similar to Ommatius. 



Abdomen : The abdomen is broad and spatulate dis- 

 tally and narrowest at the end of the second tergite; 

 the distal part of the abdomen is sometimes a little 

 wider than the thorax. The pile is abundant, appressed 

 and setate, but long and fine, and also scanty, on the 

 sides of the first and second tergites. The first tergite 

 bears 3 or 4 pairs of long, slender bristles. Female with 

 8 tergites, the eighth from a third to a half as long as 

 the seventh and with the ninth tergite projecting me- 

 dially as a short lip. The halves of the dorsal proctiger, 

 each somewhat triangular, are fused in the middle and 

 romided laterally. Sides of the seventh and eighth 

 tergites sometimes with stout, posterior bristles. No 

 males seen. 



Distribution: Neotropical: Emphysomera pulchra 

 Engel (1885). 



Ethiopian: Emphysomera auriharhis Wiedemann 

 (1828) ; hyacinthina Bigot (1876). 



Oriental: Emphysomera aequalis Becker (1925); 

 aliena Osten Sacken (1882) ; biseriata Becker (1925) ; 

 conopsoides Wiedemann (1828) ; femorata Bigot 

 (1875); hageni de Meijere (1911); nigra Schiner 

 (1868) ; nigrifemorata Bigot (1878) ; peregrina Wulp 

 (1872); spathulata Doleschall (1858) {=platymelas 

 Walker (1862)]. 



Genus Stenommarius Matsumura 



Stenommatius Matsumura, Thousand insects of Japan, addita- 

 menta 2, p. 335, 1916. Type of genus: Stenommatiua 

 formosanns Matsumura, 1916, by monotypy. 



The genus is stated by Matsumura to resemble Om- 

 matius Wiedemann but differs in the particulars noted 

 in his description : 



Body much narrower. Face in the middle with 6 bristles in 

 2 rows. Mystax much less than that of Ommatius. Ocellar 

 region with 2 proclinate bristles. Thorax in the middle with 

 three longitudinal rows of bristles. Femora without bristles, 

 only the hind femur having a preapical bristle, tibiae at the 

 apical halves with long bristles, the hind tibia being provided 

 with a prebasal bristle. Pulvilli much narrower, being broader 

 towards the apices. 



Distribution: Oriental: Stenommatius jormosanus 

 Matsumura (1916). 



Genus Cophinopoda Hull 



FiGUEES 295, 686, 1363, 1372, 2282, 2315, 2355, 2453 



Cophinopoda Hull, Proc. Ent. Soc. Washington, vol. 60, p. 251, 

 1958. Type of genus: Asilus chinensis Fabricius, 1794. 

 Designated by Hull, 1958. 



Flies that resemble large species of Ommatius Wiede- 

 mann. They are distinguished by the wide, more promi- 

 nent face, densely beset with long, bristly pile over the 

 middle, and on the cheeks, the less pronounced 

 mesonotum, the strong bristles of the scutelhun, the 

 ventral prongs of the superior male forceps and the 

 process of the hypandrium. They are more definitively 

 characterized by a patch of hairs immediately above 

 the halteral base. Length 30 mm. 



Head, lateral aspect : The head is similar to that of 

 Ommatius, except as mentioned above. The occiput is 

 moderately prominent throughout ; the long pile on the 

 ventral half is quite dense, the upper bristles of the 

 occiput are short and stout and confined to the upper 

 posterior corner of the eye. The proboscis is longer 

 than the face, robust, with subapical, lateral creases. 



Thorax: The mesonotum is not so high as in most 

 species of Ommatius. The surface is poUinose and 

 broadly covered by numerous, suberect setae, especially 

 anteriorly and it is without differentiated acrostical ele- 

 ments; dorsocentral bristles appear only posteriorly 

 where there are 2 exceptionally stout pairs. Lateral 

 bristles consist of 2 close-set notopleural, 1 supraalar, 

 1 postalar, and 1 pair of scutellar bristles, all stout and 



