NOTES ON THE NOMENCLATURE OF CERTAIN AFRICAN TABANIDAE. 149 



hair. Abdomen : first six (visible) tergites in both sexes each with its lateral fourth on 

 each side (rather more in case of $) clothed with close-set, appressed, minute, glistening 

 smoke grey hairs (extreme lateral extremities of seventh tergite in $ clothed with 

 hairs of same kind), so that dorsum of abdomen exhibits on each side a broad grey 

 stripe, which in certain aspects contrasts fairly sharply with remainder of surface, 

 which is clothed with minute appressed black hairs and thus forms a broad, longi- 

 tudinal, median, black stripe ; first (visible) tergite clothed with greyish pollen 

 on each side at base, second tergite in both sexes on each side with a roughly semi- 

 circular whitish pollinose spot on hind margin, from most points of view concealed 

 by the smoke-grey hair, but clearly visible when abdomen is looked at obliquely 

 fi-om behind, in $ a pair of similar but smaller whitish pollinose spots on hind 

 margin of each of the two following tergites also ; venter clothed with minute, 

 appressed, glistening, smoke-grey hair, last two sternites, and sometimes median 

 area of hind border of preceding sternite also, clothed mainly or entirely with black 

 hair. Wings : extreme base of costa and first longitudinal vein brownish black ; 

 ochraceous orange base extending into bases of basal and anal cells, similarly 

 coloured anterior border including upper margin of first basal and proximal fourth 

 of first submarginal cell, thence tapering obliquely to end of third costal cell ; 

 veins within ochraceous orange area similarly coloured, elsewhere dark brown. 

 Squamae light orange yellow. Halteres : stalks and knobs mummy-brown above and 

 below, tips of knobs cream-buff. Legs black and clothed with black hair, front 

 coxae anteriorly dark neutral grey pollinose, thinly clothed towards base with longish 

 pale orange-bufT hair. 



Tanganyika Territory (formerly German East Africa) : Itigi, iv, 1917 (Dr. G. D. H. 

 Carpenter). Type of (J, type of $, and 2 $ para-types, taken 18. i v. 1917 ; 7 (J 

 para-types, taken 15. iv. 1917, "on composite flower"; 1 (J para-type, taken 

 6.iv. 1917, " among low herbage." All foregoing presented by Imperial Bureau of 

 Entomology, which retains possession of six additional para-t3^pes, taken by Dr. 

 Carpenter at same time and place as specimens already enumerated. 



The extremely striking and unusual-looking Tabanid just described belongs to 

 the group of the genus Pangonia that includes P. elongata, Ric, P. beckeri, Bezzi. 

 and P. discors, Austen, but is readily distinguishable from all three species by, 

 apart from its sharply defined wing-markings and other characters, its unhanded 

 abdomen and the patches of orange-buff hair on the pleurae. The coloration of 

 the wings, in conjunction with the shining black body, would seem to suggest that 

 P. lautissima possibly mimics some species of wasp (perhaps Rhgnchium cyanopterum, 

 Sauss.), and it is worthy of note that the same colours, though differing widely 

 in extent and arrangement in the case of the wings, are exhibited by " Pangonia " 

 7nesembrinoides , Sure, of which the type was also obtained in Tanganyika Territory 

 (Amani). The latter species, however, was incorrectly assigned by its describer to the 

 genus Pangonia, and really belongs to a new genus allied to Thriambeutes, Griinb. 



Pangonia carpenter!, sp. n. 



?. — Length (8 specimens) 15 to 16'6 mm. ; width of head 4*25 to just under 

 5 mm. ; width of front at vertex 0*6 mm. ; distance from upper margin of occiput 

 to anterior extremity of face 3*5 to 4 mm. ; length of proboscis 11*75 to 13*75 mm. ; 

 length of wing 13*5 to 15 mm. 



