SCIENTIFIC NOTES. 
153 
“ I supplied him with a good series, and he went into communication 
with Mr. Grote about it, and, it seems, with some difficulty, succeeded 
in persuading Mr. Grote that it was deserving of a separate name. 
And now Prof. Smith, by the examination of the genitalia, finds them 
widely apart. I, by observing their habits, had suspected this might 
be the case, but could not prove it, whilst, from appearance alone, 
Mr. Grote had failed even to suspect it. 
“ As resemblance is not always proof that they are one, so the lack 
of it is not a demonstration that they are separate. In the early part 
of 1890, I had an opportunity of examining an extensive series of 
Lithophanes in the collection of Capt. Geddes, Toronto. I could 
arrange in line thirty or forty disposita, petiilca^ ferrealis, signosa, 
bethimei, in such a way as to make it appear impossible to tell where 
the separation should be made. What verdict would the genitalia 
give in this case ? I would expect it to be in favour of their being 
artificial species of one natural species ; yet it may not, but suppose 
it did? Let no one think that I would favour the obliterating of a 
single name.” — Canadian Entomologist. Aug., 1891, pp. 178-179. 
Wing Expansion. — As the question of wing expansion is under 
consideration in the Entomologists Record^ I enclose an observed 
instance of it, taken from the Canadian Entomologist of May, 1882, 
which may be of interest to you. What impressed me most forcibly 
in connection with it, was the contrast in its condition while expanding, 
to what I had observed in Actias polyphemus and A. cecropia, they 
appearing quite wet, whilst it seemed to be perfectly dry, and as it 
remained quiet for a length of time before there was any perceptible 
change, I came to the conclusion that it had dried, and therefore 
would not expand, 
Now as this shows that there are at least two modes of expansion, 
it leads to the suspicion that there may be more ; and what is true of 
one, may not be applicable to another. The extract is as follows : — 
“ The Da^elopment of Actias luna. — On the evening of the 12th of 
April, being at the residence of Mr. J. Johnston, a noise proceeding 
from his hatching box attracted his attention. Upon looking for the 
cause, he found a luna just emerged, the fifth from a batch of nine 
cocoons which he had raised from the egg. Its body and wings 
seemed to be quite dry, and were a pure downy white, with the ex- 
ception of the costal band, which appeared disproportionately large, 
and a minute dark speck for the eye spot. It was remarkably active 
and did a great deal of rapid travelling before it came to rest, which it 
did at last quite suddenly on the end of a twig, and then never moved 
except to better secure its foothold. Mr. Johnston placed it in a 
suitable position under the full light of the lamp, that we might watch 
its progress to maturity. The first change noticed was the appearance 
of a bright green spot near the base of the front vdng, and as that 
enlarged the wing expanded, very slowly at first, but more rapidly as it 
increased in size, the green colouring matter flowing along between the 
upper and under membrane of the wing, becoming more delicate in its 
shade as it spread first along the front of the wing, and had reached 
the apex before it extended through the inner half; but by the time it 
had touched the extremity of the whole outer angle the size, form and 
colour of the wing were complete. 
