146 THE CANADIAN ENTOMOLOGIST. 



the larval or pupal stages observed by Edwards. Dyar (U. S. Nat. Mus. 

 Bull. No. 52), Skinner (Synon. Cat. of the No. Am. Rhopalocera), and 

 Smith, J. B. (List of Lep. of Boreal Am.) list iroides as a good species, 

 and presumably regard it as such. 



On a basis of the colours exhibited by the imago one might hesitate 

 to separate iroides from augiistus, so unreliable is the character of the 

 ornamentation as a criterion for distinguishing between nearly related 

 forms, especially when separated geographically. But where constant 

 differences in size and coloration are correlated with other morphological 

 differences, and where the larvae are quite unlike in some particular, we 

 are hardly justified in trying to explain tlie facts by assuming that both 

 caterpillar and butterfly are subject to geographical variation, and that, 

 despite the correlation between larval and imaginal characters within a 

 given area, the forms are specifically identical. Even were the early 

 stages entirely unknown, it would still be of greater advantage to regard 

 the forms as distinct until they had been conclusively proven the same, 

 than to regard them as the same until some one accidentally stumbled upon 

 the disproof. 



Iroides is undoubtedly a good species, and the early stages described 

 by Edwards do not apply to august us. 



Previous Paper. — In 1904 I published,^ in conjunction with Mr. H. 

 Cook, a brief discussion of the larva and cXwys'iXx^Qi august us, based upon 

 a single specimen found on Vaccinium. The description of the mature 

 larva there given was drawn from hasty notes made after a superficial 

 examination during the evening of the day on which it was found. The 

 examination was made with an ordinary reading glass, by gas light, and 

 tlie notes were not referred to until the butterfly emerged. The descrip- 

 tion is faulty in two points. It was stated that the general colour was 

 bright yellowish-green, the only markings being a faint, darker, dorsal 

 stiipe and a very minute coral-red spot in the middle of each segment jus^ 

 above the lateral fold. The " minute spots " spoken of are the spiracles 

 and of course are not present on all the segments. Moreover, they are 

 not "coral-red," although they doubtless appeared so by contrast with the 

 intense green surrounding them. It is further stated that the head was of 

 a uniform light brown. This is also an error. The mandibles and labrum 

 are indeed brown, but the ocellar fields are black, and the remainder of 



7. Canadian Entomologist, Vol. XXXVI, p. 136 (May, 1904). 



