78 a NIGEOFUSCA: HEAD AND THORAX. 



forming a conspicuous fringe down the anterior and posterior edges 

 (cf. Figs. 18 and 16), the length of the fringe on the anterior edge 

 being equal to from one-half to threefourths of the width of the 

 third joint. 



Head greyish-buff, posterior surface smoke-grey or mouse- 

 grey ; frontal stripe mummy-brown, paler anteriorly ; ocellar spot 

 and dark brown transverse band joining bases of vertical bristles 

 as in G. fusca ; antennae partly buft', partly brown or mouse-grey, 

 second joint brown or dark brown, third joint mouse-grey or 

 grejush-brown, more or less buff at base, longer and narrower 

 than in G. fusca (cp. Figs. 18 and 16), distal extremity pi'ominent. 



Fig. is. 

 Antenna of Glossina nigrofusca, Newst. (X 30.) 



sometimes very prominent, arista buff, terminal joint as usual 

 dark brown at base beneath, ridge on upper side of proximal 

 portion of terminal joint very prominent, branched hairs more 

 numerous and closer together than in G. fusca, varying in 

 number from twenty- two to twenty-eight or twenty -nine ; palpi 

 slender, lighter or darker mouse-grey on outer side above, dark 

 brown at tips, buff or greyish below on proximal three-fourths ; 

 proboscis bulb as in G. fusca. 



Thorax. — Dorsum mouse-grey or drab-grey, with dark (olive- 

 brown or dark brown) markings of the usual tyj^e ; the latter, 

 though usually not clearl}" defined, are often so extensive that 

 little of the grey interspaces is visible ; pleurae and pectus 



