TEPHROSIA CREPUSCULARIA AND T. BIUNDULARIA. 269 
brooded type, and constantly retains its own economy. In view 
of these difficulties, and believing, as I do, from the remarkable 
fineness of Scotch specimens, that this is originally a northern 
insect, the idea constantly recurs to me, Have we here discovered, 
in this double-brooded insect, an instance of how a variety 
originates in the altered conditions of a southern climate, and 
developes its own characteristics and habits, until it becomes a 
separate species ? If so, this insect appears to be now in the act 
of transition, having its own constant characters, which still have 
not yet developed into any conspicuous or specific differences. 
I had two or three ova of this insect five years ago, laid in 
July, and reared two moths, which came out at the end of 
February. Speaking from memory, I can only say that those 
larvee strongly resembled the species described above, though 
paler, perhaps, more obese, and less distinctly marked. The 
resemblance in fact was so strong in the larva, as it is in the 
imago, that I am convinced that any definite difference (as I said 
before) will be found, if at all, in the ova. 
At any rate, I hope south-country entomologists will keep this 
subject in view in March and July next, and make an effort to 
obtain a more accurate knowledge of the egg and larva of this 
double-brooded insect, which is found, I believe, only in the 
South of England. 
Willington, Burton-on-Trent, October, 1886. 
TEPHROSIA CREPUSCULARIA AND T. BIUNDULARIA. 
By Ricuarp Soutu, F.E.S. 
SEVERAL entomologists have taken part in the exceedingly 
interesting discussion, recently conducted in these pages, con- 
cerning the identity of Tephrosia crepuscularia and T’. biundularia. 
As the facts adduced for and against are probably fresh in the 
minds of my readers, recapitulation is unnecessary. 
Probably there is nothing in the arguments brought forward 
by Mr. Tutt, or those who think with him, to shake the opinion 
of others who consider the insects identical. At the same time the 
views of the Rev. G. A. Smallwood, and other entomologists who 
agree with him, will hardly be accepted by those who consider slight 
