African Species of the Genus Acraca. 29 



(h') F.-w. without discal subapical spots periphanes f. acritoides (140) 



F.-w. with discal subapical spots ..... (V) 



(i') F.-w. with black apical patch (j') 



F.-w. without black apical patch ..... (k') 



(f) H.-w. margin narrowly black, with spots of ground-colour 



periphanes periphanes (139) 



H.-w. margin broadly black without spots of ground-colour 



periphanes f. melaina (139) 



Qi) H.-w. margin narrowly black with spots of ground-colour 



periphanes f. heni (139) 



H.-w. margin broadly black without spots of groiind-colour 



periphanes f. umida (140) 



(r) F.-w. with discal subapical spots (m') 



F.-w. without discal subapical spots .... (n') 



(m') F.-w without black apical patch . acrita manca (part) (144) 



F.-w. with black apical patch . . . lualabae (155) 



(n') Apical black 9-10 mm. deep. F.-w. spots, especially the outer 



spot in area lb, very small or absent . chaeribula * (153) 



Apical black patch very variable but at most not so deep as in 



the above. Outer spot in f.-w. lb well developed . (o') 



(o') Spots in f.-w. cell, on discocellular, and in area 2 are so large as 



to be almost or quite confluent . . acrita bellona (144) 



These spots not so large (p') 



(p') F.-w.with a white or whitish subapical band acrita ambigua (143) 



F.-w. without such band ...... (^') 



{q') Central process of last dorsal abdominal plate short 



acrita littoralis (144) 



Central process of last dorsal abdominal plate long 



acrita acrita f (143) 



acrita manca (part) (144) 



acrita bella (144) 



(p') Genital plate irt the form of a short chitinous cylinder 



acrita manca (144) 



Genital plate broad, carinate, and bifid . acrita ambigua (143) 



acrita littoralis (144) 



acrita acrita (143) 

 VII. 



F.-w. with hind marginal sjjots at least in lb and 2 . • (a) 



* Owing to the variability of acrita it is not possible to give 

 absolutely constant characters of difference between it and this 

 species. Occasionally some examples of rtccita have no spots in f.-w. 

 lb, but in these the apical black is only about 5 mm. deep. 



■f It is not possible to completely separate the forms of A. acrita 

 on merely outward characteristics, or indeed in any other manner, 

 with absolute certainty. See under A. acrita in descriptive portion. 



