270 THE ZOOLOGIST. 
Mauritius, about 360 miles distant), by Captain Raeburn, of the ship 
‘ Airlie.’ The moth is a common Indian species, but is found also in Africa. 
A specimen was long ago received from Brazil, and Mr. Grote had recently 
noticed its occurrence in Florida. 
Mr. M‘Lachlan also exhibited a cocoon and pup of a species of Cetoniide 
(probably Diplognathus silaceus) from Cameroons, sent to Mr. Rutherford. 
The cocoon appeared to be formed of dark brown earth, but attached thickly 
to the exterior were oval, slightly flattened, deep black, hard bodies (each 
nearly five lines long by two broad), which he thought were probably the 
excrement of some rodent quadruped. 
Mr. Champion exhibited Stenus Kiesenwetteri (hitherto only found in this 
country at Wimbledon), Gymnusa brevicollis, Bembidium nigricorne, and 
Plociomerus luridus, all from Chobham; also Philonthus cicatricosus from 
Shoreham. ’ 
Mr. Howard Vaughan exhibited (on behalf of Mr. Bidwell) a specimen of 
Notodonta trilophus, taken about the year 1867 at Ipswich by a lamp- 
lighter. Mr. Douglas had captured some years ago at St. Osyth, in Essex, 
what was hitherto the only authentic British specimen of this insect. 
The President read some interesting remarks from a letter he had received 
from Mr. B. G. Cole respecting some specimens of Ephyra punctaria which 
he had bred from eggs laid by the same female, the greater number of which 
emerged from the pup in July (as the spotted variety), while the remainder 
appeared in May, in all respects resembling the mother. He repeated the 
experiment in 1876 with similar results; all but one pupa from a batch of 
eggs laid in May appeared in July as the spotted form (males and females), 
the single exception remaining still in pupa, which it was presumed would 
appear during the coming May in the vernal dress. In this latter case he 
had reared a second brood of larve from eggs laid by some of the July 
females, all of which were now in the chrysalis state. Mr. Cole added— 
“May not the above be considered a case of ‘season-dimorphism’ 
analogous to that occurring in Pieris, Araschnia, Selenia, &c., as investi- 
gated by Dr. Weismann, a slow process of development during the winter 
being necessary for the production of the May form (which may be con- 
sidered the type), whilst if the development of the pupa is hastened by the 
heat (and light ?) of summer, the smaller and less perfect individuals are the 
result. Referring to the similar case of Selenia illustraria, Dr. Knaggs 
(Entom. Mo. Mag., vol. iii. p. 238) remarks as follows :—It is pretty well 
known that in the natural sequence illustraria reproduces itself in the form 
of delunaria and vice versa. But what I assert is, that whenever (whether at 
large, owing to exceptionally hot or long summer seasons, or in captivity 
from warmth, assisted perhaps by what Mr. Crewe has happily termed 
“feeding up quickly”) the completion of the pupal stage is accelerated, 
then delunaria produces delunaria, not illustraria. Further, it is my belief 
