African Pldehotomic Diptera. 285 



except last and a pair of admedian spots on each seyment except 

 first smoke-fjrey, second segment also vAth a smoke-grey median 

 stripe starting from hind border and scarcely reaching front 

 margin, third and folloiving segments except last each zvith 

 more or less distinct though incomplete smoke-grey median 

 stripe; ivings sepia- coloirred, fairly dark, light markings 

 sharply defined, usual three I'osettes present, apical sinuous 

 mark bifurcate ; legs seal-brown to clove-brown, front tibia with 

 a narrow pale band close to base, middle tibice loith two pale 

 bands, hind tibice loith a narrow pale band near base and appa- 

 rently with a similar band on distal third. 



Head: front monse-grey, with a narrow lighter edging 

 round lateral frontal spots and on extreme lateral margins, 

 vertex with clove-brown subtriangular median blotch, not 

 extending to lateral margins and divided in middle line by- 

 narrow light grey stripe running upwards from median 

 frontal spot; face and jowls light grey, a conspicuous clove- 

 brown band extending from lower inner margin of each eye 

 to base of antenna ; lateral frontal spots clove-brown, con- 

 spicuous, narrowly separated from eyes, median frontal spot 

 small and inconspicuous ; frontal callus extending from eye 

 to eye, its upper margin concave on each side of middle line ; 

 a small clove-brown spot in middle line below callus ; basal 

 joint of paljn dark mouse-grey (terminal joint wanting in 

 type) ; first joint of antenna elliptical-oval when viewed 

 from above, upper angle of second joint not prominent (third 

 joint wanting in type). Thorax : dorsum with median longi- 

 tudinal stripe complete, admedian stripes obsolete a little 

 way beyond transverse suture, usual crescentic marks on 

 hind margin distinct, smoke-grey ; pectus, pleurae, sides of 

 dorsum, and a broad hind border to scutellum smoke-grey. 

 Abdomen : dorsum with lateral borders of first five segments 

 smoke-grey, deepest on sides of first segment and progres- 

 sively diminishing in depth; venter (except last segment, 

 which is clove-brown) mouse-grey, with broad clove-brown 

 median stripe, interrupted on hind margins of second and 

 following segments, which are narrowly cream-buff". Wings : 

 outer ramus of apical sinuous mark starting from costa in 

 first submarginal cell, beyond end of second longitudinal 

 vein, and meeting margin of wing again a little above lower 

 branch of third longitudinal vein, rather broad below ; inner 

 ramus of apical sinuous mark commencing in first submar- 

 ginal cell and extending only a short distance below upper 

 branch of third longitudinal vein ; in type a row of light 

 blotches along hind margin, in distal marginal angles of all 

 posterior cells, and an additional light blotch in distal angle 



