NORTH-EASTERN RHODESIA AND THE CONGO FREE STATE. 285 



hairs ; hind tibia? in ? clothed partly with yellowish and partly with black 

 hairs, the latter predominating at distal extremities. 



Katanga, S.E. Congo Free State : Mid-Lualaba Yalley, 3000 i't., 

 18-20.iv. and l-i.v., and Mid-Lufira Valley, 3000 ft., May, 1907 (S. A, 

 JVeave). 



Although Pangonia infusca may ultimately prove to be a melanistic form 

 of P. oldii^ Austen, it seems for the present advisable to regard it as a 

 distinct species. In addition to the difference in the ground-colour of the 

 abdomen already pointed out, P. infusca may be distinguished from the 

 typical form of P. oldii by the shining facial calli being shorter, and in 

 the (^ by the face being longer, and the ventral surface of the second 

 (visible) abdominal segment being without shining yellowish-wdiite hairs on 

 the hind border. 



Pangonia elongata, Ric. 



Pangonia elongata, Ricardo, Ann. Mag. Nat. Hist. ser. 8, vol. i, p. 54 

 (1908j ; Austen, Illustrations of African Blood-Sucking Flies, p. 59, plate iii, 

 fig. 24 (1909). 



The only examples of P. elongata already recorded are those in the British 

 Museum (Natural History), which consist of the type and one other female, 

 both taken near Kilima-Njaro, German East Africa, by the late Bishop 

 Hannington. This handsome species was met with in North- Eastern 

 Rhodesia by Mr. S. A. Neave, who captured two males and one female in 

 the Chambezi Valley, between April 14th and 26th, 1908. Although of 

 considerably larger size than the typical $ (the ? taken by Mr. Neave 

 measures 18'5 mm. in length, and has a wing-expanse of 40 mm., while 

 the length of the type is 16'4 mm., and its wing-expanse 33 mm.), there can 

 be no doubt that the Rhodesian specimens really belong to P. elongata, Ric. 

 Apart from the larger size, the only noteworthy differences exhibited 

 by the $ are the somewhat greater depth of the bands of white hair on 

 the hind borders of the third, fourth and fifth abdominal segments, the 

 paler coloration of the light hair on the hind border of the sixth segment 

 and its absence in the middle line, the absence of ochraceous hair on the 

 sides of the seventh segment, and the predominance of black hair on the 

 hind tibia?. 



The Rhodesian ^ ^ (which measure 18'75 mm. in length in the case of 

 one specimen, and 21*4 mm. in that of the other) agree with the Rhodesian 

 $ in coloration and markings, except that the sixth abdominal segment has 

 no pale band on the hind margin, there being only a few yellowish hairs 

 near each posterior angle, and that the ventral surface of the abdomen, 

 elsewhere than on the white bands, is clothed with black, instead of to a 

 large extent with yellowish hairs. In the case of the larger specimen, the 



