1896.] BUTTERFLIES OF THE FAMILY HESPERIID&, 41 
This species is much paler and brighter on the underside than 
any other in the genus known to me. It is barely possible that the 
species named by me in this paper Osmodes thops may be a seasonally 
dimorphic form of thora. The males agree almost perfectly upon 
the upperside, but on the underside thops is invariably darker, 
and the female of thops has the orange spots on the upperside 
larger and differing materially in outline. 
134. O. apon, Mab. (Plate IV. figs. 13¢,159.) 
Pamphila adon, Mab. Bull. Soc. Ent. France, 1889, p. exlix. 
Hab. Sierra Leone, Gaboon. 
The description given by Mons. Mabille is based upon a specimen 
in which the lower side of the secondaries shows but two silvery 
spots. I have a series of about one hundred specimens, which reveal 
that there is variation in this respect from specimens which have 
no silvery spots at all to those which have five or six. The type 
specimen in Mons. Mabille’s collection is one which I had the 
pleasure myself of communicating to him, and represents a less 
spotted form than is quite common. A similar specimen in the 
Staudinger collection he has designated asa“ type.” ‘This species 
is undoubtedly dimorphic. I have specimens, larger in size than 
the typical form, in which the deep black basal portion of the 
primaries is not invaded near the inner margin by a narrow ray of 
the bright orange of the median band, as is the case in the type. 
But, aside from this, I find no distinction worthy of consideration, 
135. O. curysauen, Mab. (Plate IV. fig. 7.) 
Pamphila chrysauge, Mab. C. R. Soc. Ent. Belg. 1891, p. elxxii ; 
Novit. Lepidopt. p. 93, pl. xiii. fig. 4 (1893). 
Hab. Loko (Mabille), Cameroons (Good). 
This species resembles O. laronia, Hew., at first sight, the sub- 
apical orange spot being confluent with the orange-coloured discal 
area of the primaries. But the black marginal band on the 
primaries is even on its inward margin and not deeply incised at the 
nervules, as is the case in laronia. The costal margin of the second- 
aries is also much more broadly marked with black. Compared with 
adosus, a closely allied species, it may be observed that the raised 
patch of scales on the secondaries is oval in chrysauge, and not so 
nearly circular as in O. adosus, and is blackish, not reddish, asin the 
latter species ; there is a small, linear, velvety mark near this spot 
upon the inner margin, which is entirely lacking in adosus. Besides 
the ground-colour in O. chrysaugeis slightly paler than in O. adosus, 
and the black inner marginal border is narrower in the secondaries 
than in the last-mentioned species. 
136. O. aposus, Mab. (Plate IV. fig. 10.) 
Pamphila adosus, Mab. Bull. Soc. Ent. France, (6) vol. ix. 
p- exlix (1889). 
2. Pamphila argentetpuncta, Mab. MS. 
