224 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iie 



Scutellum with six or more denticles along posterior margin. Mesoscutum 

 with rows of warts. Abdominal sternites broad. Hindtibia with apico- 

 ventral spur. Face with central elevation that forms a sharp lower 

 boundary to the antennal foveae 3 



2. Face not elevated below, antennal foveae not sharply defined. Abdomen 



without dorsal pale spots .... Su'ogenus Sphaeroccra Latreille 1804, 



Type by subsequent monotj'py, Sphacrocera curvipes Latreille, 1805. 



(Other species: S. monilis Haliday, 1836; <S. flaviceps Malloch, 1925; 



S. jeanneli Richards 1938; S. uittei Vanschuytbroeck, 1948; S. ruandana 



Vanschuytbroeck, 1948; S. longipes Richards, 1951.) 

 Face elevated so that the antennal foveae are well defined below by a sharp 

 keel. Abdomen usually with two large whitish spots. 



Subgenus Parasphaerocera Spuler, 1924 



Type by original designation, Sphaerocera himacidata WiUiston, 1896. 



(Other species: S. annulicornis Malloch, 1913; (S. pallipes Malloch, 1914; 



S. flavicoxa Malloch, 1925; S. nigrifemur Malloch, 1925; S. varipes 



Malloch, 1925; S. striata Malloch, 1925; S. galapagensis Curran, 1934; 



and the new species described below.) 



3. Vein M1+2 and, to a less extent, R4+5 strongly bent forward. Mesoscutum 



uniformly covered with warts, longitudinal bare lines indistinct or absent. 



Subgenus Lotobia Lioy, 1864 

 Type by monotypy, Borborus pallidiventris Meigen, 1830. (Other 

 species: Sphaerocera simia Seguy, 1933; S. arcuata Seguy, 1933; S. 

 kivuenis Vanschuytbroeck, 1948; S. ruishuruensis Vanschuytbroeck, 

 1948; and seven species described by Vanschuytbroeck in 1959.) 

 Veins M1+2 and R4+5 not bent forward. Mesoscutum with rows of warts and 

 wide bare spaces in between some of the rows. 



Subgenus Ischiolepla Lioy, 1864 

 Type by monotypy, Borborus denticulalus Meigen, 1S2>Q = Sphaerocera 

 nitida Duda, 1923. (Other species: Sphaerocera pusilla (Fallen, 1820); 

 *S. scabricula Haliday, 1836; S. vaporariorum Haliday, 1836 = 5. para- 

 pusilla Duda, 1923; S. orientalis de Meijere, 1908; S. scabra Spuler, 

 1924; S. jansseni Vanschuytbroeck, 1948; S. flava Vanschuj'tbroeck, 

 1951; S. dura Vanschuytbroeck, 1959; S. kifaruensis Vanschuytbroeck, 

 1959; S. crenata (Meigen, 1838) =<S. coronata (Zetterstedt, 1838); S. 

 paracrenata Duda, 1923; S. falcozi Duda, 1921; <S. micropyga Duda, 

 1923. The last four species form a separate subgroup.) 



Subgenus Parasphaerocera Spuler, 1924 



This subgenus appears to be exclusively American and it now appears 

 that the species, though superficially similar to one another, are really 

 very numerous. When I was in Berkeley in 1961, I was able to 

 study a long series of males and females from one locality in Ecuador, 

 a series that was preserved in the collection of the Cahfornia Academy 

 of Sciences (CAS) . At first, the series seemed to consist of one species, 

 but more careful study showed that there were three. In order to 

 discover the relationship of these species with the supposedly common 

 Central American species, S. bimaculata Williston, I borrowed all 

 the specimens resembling that species in the collection of the U.S. 

 National Museum (USNM). Through the kind help of Dr. J. F. 



