1872.) 175 
ou un peu triangulaires, et semblent presque former, lorsque la chenille 
est en repos, deux raies non interrompues:”’ so that we must either 
give up the shape of ‘these sub-dorsal spots as a point of difference, or 
else suppose that Boisduval had seen larve of molybdeola as well as of 
complana. In coming lower down the side, below the black lateral 
stripe, which comes next to the sub-dorsal spots, we reach another 
point: and here Boisduval fails us, for he says nothing of the side of 
complana, only that “les stigmates sont peu apparents,” and “le 
_dessous du corps est grisitre,” and then he gives the colour of the legs. 
Guenée is much more precise, “a région laterale est plus pale” (than 
the ground colour), “avec des linéaments noirs, marqués, a la place 
de la stigmatale, de traits fauves, isolés, tres fins ;”” and other descrip- 
tions also speak of a reddish-yellow line running just above the feet. 
Now, the description of molybdeola before referred to does not help us 
much here, for it omits some particulars, the importance of which was 
not then seen; but the figures show most distinctly that, while in 
complana the spiracular region is occupied by one broader rust-coloured 
line, in molybdeola there is first a fine line of pale grey, then a line of 
the ground colour, and then a narrower line of the rust colour; and, 
unless the inspection of a larger number of larve of molybdeola can 
prove that this arrangement of lines is not permanent, we have in it 
a good distinctive character; and perhaps any one, who could place the 
living larvee of both species side by side for comparison, would, on a 
careful examination, find others equally good. 
9th December, 1871. 
DESCRIPTION OF A NEW AFRICAN BUTTERFLY. 
BY THOMAS CHAPMAN. 
Crenis BENGUELS, 0. sp. 
&. Upper-side: both wings pinkish-lavender. Fore-wing: apex 
black, narrowing down the hind margin, and continued slightly up the 
nervules ; a row of five marginal black spots near the apex, and a larger 
black spot near the anal angle. Huind-wing: outer margin edged with 
black ; a marginal band of oval black spots, and more inwardly a row 
_ of five black dots ; fringes white. 
Under-side : fore-wing: base orange, rest light bluish-green ; cen- 
tral portion blotched with purple and black, outer margins edged with 
black ; a marginal row of eight black spots, with an inner row of three, 
near the costa. Hind-wing: light blue-green, outer margin edged with 
