134 A. WATSON 



Abdomen same colour as corresponding adjacent surface of hind wing. Antemedial fascia of 

 hind wing continued across abdomen as a transverse band. 



o* genitalia as in Text-figs. 219-220. Setose lobes at base of valve less pronounced in 

 torulns than in nominate subspecies. Digitate apical process of aedeagus subject to slight 

 individual variation in length in both subspecies. Each lobe of posterior margin of eighth 

 abdominal sternum with short digitate process in torulus. Eighth abdominal tergum similar to 

 than in brunneola, weakly sclerotized posteriorly. 



Dorsal region of eighth segment in $ genitalia highly modified and heavily sclerotized 

 (Text-figs. 223, 224). Signum a pair of hemispherical invaginate cups, spinose on internal con- 

 vex surface. 



Measurements. A.P.R. : $. 5 ; $. 3. 



Discussion. The differences in colour-pattern between this species and brunneola 

 are well-defined. In angustipennis the postmedial fascia on the upper surface of the 

 fore wing reaches the anal margin at its mid-point or just proximal to this (not distal 

 to mid-point as in brunneola), and neither the antemedial fascia nor the dark streak 

 extending outwards from the cell are present (both present in brunneola). In the 

 male genitalia the shape of the saccus, aedeagus, eighth abdominal sternum and the 

 processes at the base of the valve distinguish the two species. The female signum 

 is diagnostic : it is double in angustipennis and simple in brunneola. 



The individual variation in the colour-pattern and coloration is perhaps more 

 striking in this species than in any other African species of the Drepanidae. The 

 most conspicuous specimens are those which possess large dark brown or pinkish 

 patches at about the middle of the anal margin on both wings, e.g. Plate 14, fig. 329. 

 Another striking form is that illustrated in Plate 14, fig. 327 : in this form the 

 normal, yellow ground-colour of the fore wings is replaced, except at the base, by 

 pink or brownish pink ; the hind wing is yellow proximal to the antemedial fascia, 

 but is either entirely pink or brownish pink distal to this fascia or has a broad pink 

 band as in the illustrated specimen. A further interesting colour variation is that 

 illustrated in Plate 14, fig. 326, represented by only two females : in this form the 

 whole of the upper surface of wings is densely speckled with brownish grey. 



There is little doubt that hylaeina has been correctly synonymized with angusti- 

 pennis as although the holotype of hylaeina is certainly lost (it was deposited in the 

 collection of the Hamburg Museum, which was destroyed during the 1939-45 war) its 

 identity is clear from the reasonably good figure accompanying the original descrip- 

 tion. The holotype of glaucinoe has been compared with the type of angustipennis 

 and found to be conspecific. 



Distribution (Map 6). Ranges from the Ivory Coast to Uganda. Two 

 specimens from the Congo (i <$, Elisabethville, in the British Museum (Natural 

 History) and 1 <$, Kapanga, in the Tervuren Museum) belong to this species but their 

 subspecific identity is doubtful. 



Isospidia angustipennis angustipennis (Warren) 



(Text-figs. 219-221, 223 ; PL 14, 326-328 ; Map 6) 



Diagnosis. q\ $. Separable from the Ugandan subspecies apparently only by the genitalia. 

 In the male the lobe on the ventral surface of the base of each valve is larger than in torulus and 

 the posterior margin of the eighth abdominal sternum lacks the small digitate lobes of torulus 



