102 THE CANADIAN ENTOMOLOGIST. 
I name this little species after my friend and brother entomologist, the 
late Coleman T. Robinson, whose sudden death has caused so great 
sorrow in many circles, besides the one in which I knew him best. Who. 
shall say now that he wasted his time in describing the little insects he 
loved, when it is his descriptions of new species of North American Moths 
that will keep his fame after death, and, in the nature of human things, 
long after his other qualities shall have been forgotten by men? So many. 
are now properly sorrowing for him—I have only to remember this and 
be silent. 
NOTES ON” PIERIS "RAE 
BY G. J. BOWLES, MONTREAL. 
The April number of the ENTOMOLOGIST contains a communication 
from my esteemed friend Mr. S. H. Scudder, with reference to the yellow 
male variety of this species. In it he asks several questions which I shall 
endeavour to answer, adding some other particulars to make my notes as 
complete as possible. 
I think that entomologists will agree with me in considering P. rape 
as one of the most interesting insects existing on this continent, not only 
with reference to its destructive habits, but also on account of its recent — 
introduction and rapid dissemination over the country. The Colorado 
Potato Beetle is, perhaps, the only species whose progress has been so 
carefully recorded ; for both have “made their mark” as they spread from 
place to place, although the butterfly has not been such a formidable 
enemy as the beetle. A new subject of interest—the yellow male variety 
-——is now added to the history of the butterfly, and it is certainly worthy 
of the attention of students, as it may, in the future, aid in solving some 
of the problems connected with climatic influences and the distinction of 
species. 
I first met with yellow males in 1863, and mentioned it in my paper 
on Pieris rape published in the Canadian Naturalist for August, 1864. 
Since then I have captured similar specimens each year, and found them 
to be produced throughout the season. I remember taking one or two 
so early in the spring that I felt satisfied they belonged to the very first 
brood of the year, which led me to conclude that the variety is likely to 
appear at all parts of the season, and in every brood. ‘Those which I 
captured on the wing have always been males, but, strange to tell, among 
