230 



THE CANADIAN ENTOMOLOGIST. 



terms and the use of the asterisk are the same as I employed in outlining 

 the life-history of/, angustus (see Can. Ent. for July, 1906). 



The larval stages of this species were worked out by William Henry 

 Edwards with such careful accuracy that little remains for me to do 

 beyond paying tribute to the character and quality of his work and 

 verifying the facts published in Papilio (Vol. I, p. 150-152), a quarter of a 

 century ago. However, since I have had the exceptional good fortune 

 of breeding the larvte side by side with those of irus, augustus and tiiphon, 

 I venture to hope that my observations will be of added value by reason 

 of the comparisons thus made possible. 



First Stage. — The caterpillar begins life in the generalized form 



described by Edwards thus : "Length, 4-100 inch ; shape, oval ; broadest 

 anteriorly, the base flattened ; dorsum high and sloping posteriorly ; the 

 summit of dorsum flattened for a little space, and on either side there is a 

 row of long recurved white hairs; along edge of base is another row of 

 similar hairs bent down ; colour brownish-yellow ; head obovoid and 

 smooth." I may add that the head is brownish-yellow, with rich brown 

 mandibles and labrum, and the short dusky bristles associated with the 

 laterodorsal series of hairs are present. Without careful examination 

 with a microscope the new-born larvae are indistinguishable from those of 

 irus or augustus. 



