African Phlehotornic Dipt era. 277 



Hamatopota gracilis, sp. n. 



2 . — Lengtli (1 specimen) 8*4 mm.; width of head 2'4 mm.; 

 width of front at vertex 1 mm. ; width of fourth segment of 

 alxlomen 1*8 mm.; length of wing 7*4 mm. 



Narroio-bodied species, without spots or median stripe on 

 abdomen or bands on tibia. — Frontal callus not extending from 

 eye to erje ; dorsum of thorax dark greyish brown, with not 

 very distinct longitudinal grey stripes ; dorsum of abdomen 

 olive-brown, with a yellowish grey sheen, unicolorous ; wings 

 sepia-coloured, moderately dark, light markings distinct and 

 relatively simple, rosettes present and each composed for most 

 2)art of a single series of more or less disconnected marks, 

 apical sinuous mark slender, not bifurcate. 



Head', face smoke-grey, front yellowish grey, vertical 

 region brownish; lateral frontal clove-brown spots moderately 

 large, conspicuous, not in contact with eyes, median frontal 

 spot wanting or indistinct ; frontal callus bistre, rather 

 narrow from above downwards, rounded at extremities, which 

 are distinctly separated from eyes, somewhat triangular in 

 outline, upper margin rising to a point in middle line, lower 

 margin nearly parallel with upper on each side of middle 

 line; 710 dark median spot below callus ; palpi Isabella-coloured, 

 terminal joint moderately expanded at base, tapering to a 

 point at distal extremity, clothed on outer side with rather 

 rough-looking black hair and on under side with a few 

 whitish hairs; antenme slender, first and second joints pale 

 ochraceous buff, third joint russet, last three annuli darker, 

 terminal annulus mummy-brown at tip, longer than two 

 preceding annuli taken together, first joint of antenme not 

 incrassate, short, clothed with black hairs towards tip, upper 

 angle of second joint not produced, third joint elongate, 

 tapering, but little expanded at base. Thorax : dorsum 

 greyish in front, where there is a faint indication of com- 

 mencement of a very narrow median grey stripe, a pair of 

 broader admedian grey stripes also visible, but dying away 

 about half-way between transverse suture and hind margin, 

 no distinct grey crescentic marks on latter; pectus, pleuije, 

 and sides of dorsum smoke-grey ; scutellum of same colour 

 as dorsum. Abdomen : dorsum clothed with minute, a^i- 

 pressed, buff- yellow hairs, no light hind borders to segments, 

 though extreme hind margins narrowly pale (cream-buff) ; 

 venter olive-grey or smoke-grey, clothed with minute ap- 

 pressed yellowish hairs, hind margins of segments narrowly 

 pale, an ill-defined dark median longitudinal stripe visible 

 when venter is viewed from certain angles, invisible from 



