Coe) 
line, which is concentric with the eye-spot, bounds it upon 
the posterior-inferior section of its circumference. A sketch 
sent by Mr. Leigh in further explanation of his exhibit shows 
that, when touched, the larva curves the anterior segments 
so as to conceal its real head and make the central point 
between the eye-spots anterior in position. From this central 
point the four relatively immense processes radiate like spokes, 
while the bright orange colour and jet-black eye-spots placed 
on each side of the centre must contribute with them to 
produce an extraordinary and terrifying appearance. By Mr. 
Leigh’s desire the specimen will be placed beside the imagines 
xii] 
of the same species in the collection of the British Museum 
of Natural History. The larva bears the date :—‘‘ Durban, 
Noy. 3, 1906.” 
Errect oF ARTIFICIAL CONDITIONS ON SEASONALLY D1Mor- 
pHic Specres.—Dr. F. A. Dixry exhibited specimens of Tera- 
colus achine, Cram., and Selenois severina, Cram., bred and 
captured at Salisbury, Mashonaland, by Mr. G. A. K. Marshall. 
He remarked that the exhibit, which was supplementary to 
that shown by him on December 5th (Proc. Ent. Soc. Lond., 
1906, p. civ), provided a further instalment of the results of 
Mr. Marshall’s valuable experiments on the effect of artificial 
conditions on seasonally dimorphic species. In the case of 
Teracolus achine, the exposure to conditions of moist heat in 
both larval and pupal stages had caused both sexes of a brood 
that should normally have emerged as the dry-season form, to 
assume the appearance of a wet-season generation. The same 
conditions operating in the larval stage alone had produced a 
close approximation to the same result ; while in specimens 
which had been similarly treated in the pupal stage only, little 
or no departure could be seen in the direction of the wet- 
season form. Specimens of both seasonal phases caught in 
the open were exhibited for comparison, and it was pointed 
out that these results with Zeracolus achine showed complete 
correspondence with those previously announced in the case of 
T. omphale, Godt. 
The behaviour of Belenois severina contrasted strongly with 
that of the two species of Zeracolus, for whereas in the case of 
AY 2 
