40 G. TACHINOIDES: THOEAX, ABDOMEN, ETC. 



third joint greyish-brown or mouse-grey, more or less tinged with 

 buff at base, arista buff, second joint and proximal half o£ terminal 

 joint dark brown below, branched hairs fourteen to sixteen in 

 number ; paljji buif-yellow, greyish-brown at tips ; proboscis bulb 

 mummy-brown or raw-umber-coloured. 



Thorax. — Humeral calli and pleurae drab-grey, former with 

 a dark brown spot or blotch above (sometimes wanting or 

 indistinct) ; pectus smoke-grey ; scutellum cream-buff, with a dark 

 brown blotch, roughly triangular in outline, on upper surface on 

 each side of middle line ; apical scutellar bristles in 9 about 

 one-third of length of those of $ . 



Abdomen. — Median quadrate pale area on dorsum of second 

 segment verij conspicuous, and (regarded in conjunction with the 

 dark hind tarsi) distinctive, owing to its shape ; dark brown or 

 clove-brown interrupted bands on subsequent segments, as shown 

 in Plate IV, not reaching either lateral or posterior margins ; 

 seventh segment cream-buff or smoke-grey pollinose, in 9 some- 

 times with a trace of dark markings like those on preceding 

 segment ; hypopygium of ^ oval, pale Isabella-coloured. 



Legs buff, hind tarsi as described in diagnosis printed in 

 italics above ; front or front and middle femora more or less grey 

 on outer side, hind femora also sometimes with a greyish infusca- 

 tion on outer side towards distal extremity, middle femora with 

 a conspicuous dark brown elongate blotch on under side near tip, 

 hind femora with a trace of a similar mark ; tips of last two 

 joints of front and middle tarsi mummy-brown, tips of remaining 

 joints of middle and sometimes also of front tarsi faintly 

 brownish. 



Wings tinged with drab. Squamae waxen-white, fringe short, 

 yellowish. Halteres cream-coloured. 



The foregoing re-description is mainly based on a ^ and 9 iii 

 the British Museum (Natural History), taken at a spot six miles 

 south of Mulgue, Bornu Province, Northern Nigeria, on July 

 22nd, 1910, by Dr. B. Moiser, W.A.M.S. 



Distribution of G. tachinoidcs, Westw. 



G. tachinoides has a very wide range in West Africa, where, 

 as for instance in Northern Nigeria, it is often locally abundant. 

 Besides being found from Senegal to French Congo, the species 

 also occurs in the French Sudan (on the shores of Lake Chad and 

 the banks of the Bani and Shari Rivers) ; and, although not yet 



I 



