A REVISION OF THE ETHIOPIAN DREPANIDAE (LEPIDOPTERA) 63 



medial fascia of the upper surface of the wing, and from all species except natalensis 

 by the presence of dark striations at right-angles to the postmedial fascia on the fore 

 wing. The shape of the valve, tegumen, saccus, uncus and gnathus, the presence 

 of a flattened process at the base of the aedeagus, and the widely separated posterior 

 processes of the eighth tergum characterize the male genitalia and distinguish 

 bimaculata from each of the remaining species of Negera. 



Apart from bimaculata the females of only natalensis, unispinosa and quadricornis 

 are known. It is therefore difficult to assess the diagnostic value of the specific 

 characters of the female of bimaculata though it seems probable that the strongly 

 convex outer margin and postmedial fascia of the fore wing will prove to distinguish 

 it from ramosa, disspinosa, clenchi and confusa as well as from the species mentioned 

 above whose females are known. 



The variation in the intensity of coloration of the large spot on the fore wing 

 posterior to the cell between Cu lh and lA misled Gaede (1927) into describing 

 immaculata (holotype with spot hardly visible), a junior synonym of bimaculata 

 (holotype with conspicuous spot). There is also considerable variation in the 

 ground-colour of the wings (see description). 



The genus Ancistrota Hiibner, in which bimaculata was first placed, is a genus of 

 Syssphingidae. 



Distribution (Map 3). Known from the rain-forest regions of Liberia, Ivory 

 Coast, Ghana, Cameroun and Gabon. There is a female from Paulis (north-east 

 Congo), in the collection of the Musee Royal de l'Afrique centrale, Tervuren, which 

 belongs to this species but may prove to represent a new subspecies when male 

 specimens become available for comparison. A single male from Boukoko (Central 

 African Republic) in the Institut d'Enseignement et de Recherches tropicales, 

 Bondy, which almost certainly represents a new subspecies of bimaculata may be 

 consubspecific with the female from Paulis. 



Material examined. Types. Holotype <$ of bimaculata Holland, " Ogove " 

 [Ogowe River, Cameroun], " C. M. Ent. type series 200 " ; in the Carnegie Museum, 

 Pittsburgh ; (examined for me by Dr. Clench). Holotype <$ of immaculata Gaede, 

 Ogowe [Cameroun] ; in the Zoologisches Museum, Berlin. 



Other material. British Museum {Natural History). Liberia : 1 $, Kitoma 

 (7 19' N, 8° 47' W), 1,600 ft., 29.viii.1953 (Peters). Ghana : 1 J, W. Provinces, 

 Aiyinasie, vi.1925 (Hyatt). Cameroun : 2 ^, 4 $, Bitje, Ja River, 2,000 ft., x, 

 xi.1915 (Bates and others). Gabon : 2 (J, Tchibanga (Rougeot). 



Negera natalensis (Felder) comb. n. 

 (Text-figs. 99-108 ; PI. 6, fig. 294 ; Map 3) 



Ctenogyna natalensis Felder, 1874 : 3, pi. 85, fig. 4. 

 Ctenogyne [sic] natalensis Felder ; Gaede, 1931 : 50. 



Description. $, $. Dorsal surface of palp brown or brownish scarlet, ventral surface yellow 

 or buff. Front of head pale orange, vertex yellow or buff ; posterior margin of head with dark 

 reddish brown fringe laterally and ventrally. Antenna buff. 



