1920] Holland, Lepifhptera of (he Congo 203 



of the hind wing, where it joins the body. In the general color of the 

 wings it closely approaches C. sangaris, from which, however, it may at 

 once be discriminated by the different form of the outline of the primaries, 

 which are not as much excavated on the margin and truncated at the 

 lower angle as is the case in C. sangan's. In the fine suite of females in 

 my possession I detect some variation, and one female has the apical 

 third of the wing not white, but reddish. For this slight variety the 

 name rubescens may be proposed, if such things deserve to he discrimi- 

 nated nomenclatorially. Expanse, (f , 52-GO mm.; 9, 60-75 mm. 



Messrs. Lang and Chapin did not take any specimens of this 

 species, but I atone for the lack by donating to The American Museum 

 of Natural History a pair taken from my cabinet. I have no doubt that 

 it occurs on the Upper Congo, as well as in the valley of the Ogove. 



EupTERA Staudinger 



(284) 1. Euptera pluto (Ward) 

 Euryphene pluto Ward, 1873, Ent. Mo. Mag., X, p. 59. 



One male taken at Medje the first week in August. 



PsEUDATHYMA Staudiuger 



(285) 1. Pseudathyma sibyllina (Staudinger) 

 Pseiidacropa sibyllina Staudinger, 1890, Iris, III, p. 338, PI. in, fier. 8. 

 Pticudathyina sibyllina Staudinger, 1891, Iris. IV, p. 90. Aurivillius,, 1912, Seitz, 



Gros.>Schmett., XIII, p. 156, Pl.xLixe. 



One male taken at Medje the first week in August 1910. 



The specimen differs slightly from the descriptions and figures of 

 this species which have been given by both Staudinger and Aurivillius. 

 It would, however, be a mistake to attempt to describe it as a different 

 species without more material at hand. There is before me a good speci- 

 men of Pseudathyma neptidina from the Ogove Valley, which the speci- 

 men somewhat closety resembles on the under side, but the absence 

 on both sides of the long white bar in the cell of the fore wing, which is 

 one of the diacritical marks of P. neptidina, forces me to assign it to P. 

 sibijUina, with which it agrees better than with any other species which 

 has been described. The specimens representing this genus in the col- 

 lections of the world are thus far very few, and, beside the individual I 

 am reporting upon and a few in my own collection, there are no others in 

 America, and only half a dozen in the museums of Europe. No doubt 

 the insect is common enough, but its mimetic resemblance to other forms 

 which are so common as to make them almost unworthy of notice by 

 collectors, has led to its having been overlooked. 



