THYRIDIDAE OF AFRICA AND ITS ISLANDS 157 



o". Wing, 11-13 mm. Vertex whitish brown, irons similar. Labial palps with third seg- 

 ment 1/2 length of second, upturned, just reaching vertex. Thorax pale whitish brown. Hind 

 tibia with outer spur of distal pair 1/2 length of inner spur ; inner spur slightly less than length 

 of 1st hind tarsal segment. Proximal spurs of hind tibia with inner spur longer than inner 

 spur of distal pair. Fore wing, pattern as in PI. 19, fig. 99, whitish with pale grey-brown mark- 

 ings. Dark spot in cell, several dark spots in between veins subterminally Underside darker 

 than upperside Costal margin brown. Iridescent scales in line subcostally (PI. 19, fig. 100). 

 Hind wing, colour and pattern as fore wing, black spot in centre of wing smaller than fore wing 

 black spot. No iridescent scales on underside. Sc+R 1 and Rs approach closely but do not 

 join. 



Genitalia $ (PI. 43, fig. 244). Median basal process with lateral toothing. 



$. Wing, 13-14 mm. Colour and pattern as in male. Labial palps reaching slightly above 

 vertex. 



Genitalia $ (PI. 65, fig. 411). No signum in bursa although traces of minute sclerotizations 

 found in one specimen from the Ivory Coast. 



Discussion. The shape of the median basal process in the male and the lack 

 of the signum in the female are the characters separating this species from S. 

 piagalis Gaede. Externally S. plagalis has more black spots, particularly on the 

 hind wing, but otherwise these two species are very similar and may be forms of a 

 single species. No intermediates have been found between these two species in the 

 specimens examined. 



Distribution. Map 65. Ivory Coast ; Nigeria. 



Material examined. 



Holotype <J, Nigeria: Warri, ix.[i8]o,7 (Roth), BM slide no. 9607, in BMNH. 



Nigeria: i £, data as type; 1 $, Warri, Niger, CP., v. 1897 {Roth); 2 9, Degama, 

 Niger, CP (Ansorge), iv.1902; 1 $, Ogruga, Niger; 1 <$, U.C. Ibadan, v. 1958 (Sutton) ; 

 Ivory Coast: i $, 5 $, Bingerville, vi-x.1915 (Melon). 



Sijua plagalis (Gaede) comb. n. 



(PI. 19, figs 101, 102; PI. 43, fig. 245; PI. 65, fig. 412) 



Rhodoneura plagalis Gaede, 1917 : 376. 



Rhodoneura plagialis [sic] Gaede; Gaede, 1929 : 492. 



<J. Wing, 12—14 mm. Vertex whitish, frons flattened between eyes, whitish. Labial 

 palps with third segment 1/3 length of second, upturned, reaching vertex. Thorax whitish. 

 Hind tibia with outer spur of distal pair less than 1/2 length of inner spur. Inner spur of distal 

 pair almost as long as first hind tarsal segment. Proximal and distal pair of spurs similar in 

 length. Fore wing, pattern as in PI. 19, fig. 101, whitish, patterned with grey, black discal 

 spot, black spots between veins subapically. Black discal spot and hind (median) margin 

 spots often enlarged. Underside brownish with pattern well marked. Iridescent scales under 

 costal margin (PI. 19, fig. 102). Hind wing, colour and pattern as fore wing. Large black 

 spots, often rather square in shape, in median position near hind margin. These black spots 

 are variable in number, frequently four or more, sometimes only one. Sc+i?j approaching Rs 

 but not joining. 



Genitalia $ (PI. 43, fig. 245). Small cornuti in aedeagus. 



$. Wing, i3 - 5-i5 mm. Colour and pattern as male. 



Genitalia $ (PI. 65, fig. 412). Signum usually double, sometimes smaller sclerotization in 

 bursa but not as many as in S. jejunalis Pag. 



