254 THE CANADIAN ENTOMOLOGIST. 



have been reared on carrot, fennel and parsnip. The eggs spoken of 

 hatched before Mr. Bruce left Colorado in September, and he biought 

 the larvae to his home at Brockport, N. Y., and enclosed them over a bed 

 of growing carrots in his garden, under a wire gauze screen or box. In 

 this wny he got upwards of forty pupae, but discovered soon that almost 

 all had been stung by Asterias parasites. Out of the lot there were but 

 three healthy pupse, two of which produced Bairdii in the spring of 

 1893, and one a <j? Oregonia, which Mr. Bruce sent me. But a few of 

 the larvae when half grown had been sent to Mrs. Peart, near Philadelphia, 

 and from these she got four pupae. These yielded in spring of 1893 

 one Bairdii and one very large and well-marked ? Oregonia, which also 

 I now have. The other two pupse are going over to 1894, as is often the 

 case with the western Papilios, they running in the pupa stage for two 

 years. 



In 1893 Mr. Bruce was again upon the ground, and devoted his time 

 largely to getting at the facts in this case. On the 23rd July he sent me 

 two eggs of the Oregonia, as before, laid by a confined female. I sent 

 one to Mrs. Peart, and she reared the larva and got a pupa 23rd August. 

 Out of this, 8th September, came a $ Bairdii. The other egg produced 

 a larva which died soon after third moult. 



On 7th August, Mr. Bruce sent me twenty-four eggs of the Oregonia. 

 obtained as before. The larvae from these died off rapidly, and at all 

 stages : seemed not to like their food. I treated them exactly as I have 

 heretofore treated larvse of Papilio, but I obtained only five pupse. Some 

 of the larvae were certainly killed by the others, their bodies sucked dry, and 

 this indicated, I think, a dislike to the food given. From the five pupae 

 up to date (21st September) have emerged four Bairdii imagos, 2^,2$. 



Thus imagos of Bairdii have come from eggs laid by the Oregonia, and 

 in two instances Oregonias have come from eggs laid by Bairdii. As to 

 Hollandii none of the Bairdii so far obtained are of that form, and its 

 relationship to Bairdii is still but a matter of conjecture. 



I am not satisfied that the form we are calling Oregonia is identical 

 with the type form found in Oregon and Washington j am inclined to 

 think it is not, and intended to propose the name Bruceiiox it. But, until 

 more examples of the real Oregonia can be seen, I can come to no final 

 conclusion. 



I must not omit to say that at all stages the larvae of these two forms 

 are indistinguishable. 



