139 



NOTES ON THE NOMENCLATURE OF CERTAIN AFRICAN TABANIDAE 

 (SUB-FAMILY PANGONIINAE), WITH DESCRIPTIONS OF A NEW 



GENUS AND NEW^ SPECIES. 

 By Major E. E. Austen, D.S.O. 



Some six years ago, it was correctly pointed out by Brethes (Bull. Soc. Ent. de 

 France, 1914, p. 59) that the generic designation Diatomineiira, Rond. (Archiv. 

 Zool. Anat. Fisiol. iii, p. 84, 1864), is a synonym of Osca, Walk. (Ins. Saund., 

 'Diptera, Part i, p. 10, 1850 — nee Walk., 1864, nee Stal, 1871). The first species 

 mentioned by both Walker and Rondani is Pangonia depressa, Macq. (^=:Erephopsis 

 lata {Tabanus latus), Guer.), and this species is designated by Brethes as the genotype. 

 ErepJiopsis lata, Guer., of Kertesz's Catalogus Dipterorum (iii, p. 165, 1908), must 

 therefore be known henceforth as Osea lata, Guer., and the South African Tabanus 

 barbatus, L. {Pangonia barbata, Auct.), and Pangonia fulvifaseia, Walk., must be 

 transferred to the genus Osea, 



It is not, however, simply a question of substituting Osea for Diatomineura, 

 since Osea lata, Guer., is certainly not congeneric with any, or at any rate with the 

 majority of the species at present grouped under Diatomineura, sub-genus Corizoneura. 

 So far as regards Ethiopian and Oriental species, the difficulty can be met by, as is 

 hereby proposed, raising Corizoneura, Rond. (loe. eit., p. 85) to generic rank, desig- 

 nating as its genotype the first species mentioned by Rondani under Corizoneura, viz., 

 Tabanus aethiopicus, Thunb. (syn. Pangonia appendiculata, Macq.), and erecting 

 a new genus, which may be termed Buplex,^ for certain Ethiopian species included 

 by Kertesz under the Corizoneura division of Diatomineura, but not congeneric 

 with C. aetJiiopica, Thunb. The arrangement indicated may be expressed in tabular 

 form as foUows. 



Eyes bare ; first posterior ceU open. 



Ocelli absent ; face, especially in $, markedly produced (forming a snout-hke 

 prolongation), with a shining callus, or at least a more or less shining area, on each 

 side ; proboscis long or very long, usually much longer than thorax including 

 scutellum, and generally horizontal or nearly so ; distal extremities of first and 

 second joints of front tarsus in (J generally each produced above into a tongue- or 

 lappet-like process, which, in case at least of second joint, is often of considerable 

 relative length . . . . ^ . . . . . . . . . Corizoneura, Rond. 



(Genotype, Tabanus aethiopicus, Thunb., — syn. Tanyglossa aethiopica, Thunb. ; 

 Pangonia appendieulata, Macq.). 



Ocelh usually present; face not produced, merely convex, and without shining 

 caUus or area on each side ; proboscis of only moderate length, shorter than or 

 about as long as thorax including scutellum, and generally slanting downwards 

 atanangleof 45°; distal extremities of tarsal joints never produced .. 



Buplex, gen. no v. 

 (Genotype Pangonia suavis, Lw.). 



* /Soy-TrXTjl 6, an ox-goad. 



