( Siv ) 
while in combination they could effect a transformation to the 
full wet-season form, the employment of the latter only with- 
out the former produced an entirely different result, the most 
distinctive mark of the new form being the accentuation of a 
feature usually characteristic of the dry season. 
ODEZIA ATRATA ABERRATION.—Mr. Setwyn Imace brought 
for exhibition an aberration of Odezia atrata, Lin., taken by 
Dr. G. B. Longstaff at Mortehoe, N. Devon, on June 26, 1906. 
The specimen differed very obviously from the ordinary form. 
The fore-wings were rather sharply angulated at the apex 
instead of rounded. Head dull ochreous. Thorax and abdo- 
men densely irrorated with ochreous. Fore-wings greyish- 
ochreous irrorated with black. Hind-wings black irrorated 
with ochreous terminally. Cilia of fore-wings white. Cilia of 
hind-wings black, shading off into ochreous at the edge. The 
flight, he said, suggested that of a Pyralid rather than of a 
Geometrid. 
SEPARATION OF HELIconius Specres.—Mr. W. J. Kays, who 
exhibited a series of the genus Heliconius, said that they 
were arranged to show (1) how Herr Riffarth in a paper 
published in 1901, entitled “ Die Gattung Heliconius,” divided 
the genus into two main divisions by a secondary sexual 
character, viz., Group I, in which the inner margin of fore- 
wing of ¢ on under-side is composed of smooth scales reaching 
the median nervure, and Group II, in which the smooth scales 
do not reach the median nervure by about a millimetre. This 
classification very nearly gives equal proportions for both I 
and II. In point of fact, 34 species in I and 37 in II, includ- 
ing very many sub-species in both. The remarkable result 
of the application of these characters revealed the fact that 
in several instances what we had hitherto called one species 
was in reality two species, one belonging to Group I, the 
other to Group II. Thus Heliconius hydara was found to 
embrace a sub-species of H. amaryllis in euryades, Riff., /. 
xenoclea included H. batesi,* Riff., and H. phyllis included 
H. nanna. 
* H. batesi, Riff., falls as a synonym of H. xenoclea, Hw., as Riffarth 
mistook Hewitson’s figure of H. xenoclea to represent a species in Group II, 
and described the species in Group I as batesi. In Hewitson’s collection 
(now in the National Collection) no specimen of Group II exists, so that 
