278 Mr. E. E. Austen on new 



others. Wings : apical sinuous mark commencing in distal 

 extremity of marginal cell, above end of second longitudinal 

 vein ; immediately beyond stigma, which is dark brown, 

 long, complete, and well-marked, is a small and not very 

 distinct light mark, looking something like the figure 8 with 

 its upper half blurred ; no light mark running up to costa at 

 proximal end of stigma; series of detached oblique light 

 marks across posterior cells conspicuous ; no light spots on 

 hind margin, in distal angles of posterior cells ; light marks 

 in basal cells of normal type ; zigzag mark and basal loop in 

 axillary cell present, but not connected, no light spot on sixth 

 longitudinal vein beyond zigzag mark ; discal cell with two 

 widely separated transverse light marks (in one wing of type 

 also an indistinct light fleck in proximal extremity). Hal- 

 teres : stalk cream-buff, knob dark brown. Legs : femora 

 greyish fawn, tibiae cinnamon-coloured, front and hind pairs 

 brown or brownish at tip, front tarsi dark brown, last joint 

 and tips of preceding joints of middle and hind tarsi brown, 

 first joint of middle tarsi except tip and basal half of first 

 joint of hind tarsi cream-buff, neither front nor hind tibia in 

 the slightest degree incrassate. 



Northern Nigeria; Little Koriga River, 18. vii. 1907 

 (./. Brand). 



I have little hesitation in regarding as conspecific with the 

 $ described above a single <$ from Keffi. Xassarawa 

 Province, N. Nigeria, 16. ix. 1907, "in house" (Dr. R. F. 

 Williams). Assuming this belief to be correct, the <$ of 

 H. gracilis may be characterized as follows : — 



£ . — Length (1 specimen) 8*8 mm. ; width of head 3 mm. ; 

 width of fourth segment of abdomen 1*5 mm. ; length of 

 wing 7 - 5 mm. 



Thorax (including scutellum), icings, halter es, and legs as in- 



$ (femora somewhat darker), abdomen narrower (at least in 



typical specimen) , first four segments cinnamon-coloured, last 



three segments olive-brown, dorsum with a yellowish grey 



pollinose sheen when viewed at a low angle. 



Head : terminal joint of palpi bluntly cylindrical-ovate, 

 mouse-grey, clothed with tine blackish brown hair; first joint 

 of antenna short, slightly incrassate, buff-coloured, second 

 joint likewise buff, third joint extremely slender, scarcely 

 wider at base, ochraceous buff, usual patch of minute black 

 hairs conspicuous just beyond base on upper side, distal 

 extremity of terminal annulus dark brown. Abdomen : 

 dorsum slightly darker at base of first and toward* hind 

 margin of fourth segment, clothed throughout with blackish 

 mingled with pale yellow hairs ; venter clothed with minute, 



