THE CANADIAN ENTOMOLOGIST. 253 



the under side of tibia I. in the $ ; the legs have many short hairs, and 

 there are small spines at the ends of the joints. 



The dorsum is dirty-white or gray, with a broad brown or blackish 

 vase-mark. On the cephalothorax, the vase-mark covers nearly the whole 

 surface ; on the abdomen it grows narrower on the second and quite 

 suddenly enlarging on the third segment ; then gradually narrowing to 

 the tip of the abdomen. The white or gray of the sides contains a few 

 black spots. Venter dirty-white, with black spots ; legs pale yellowish- 

 brown ; mandibles white, with a large brown spot above on the basal 

 joint, and some smaller ones on the second joint. 'Femur of palpus 

 almost wholly brown, some small spots on patella and tibia, tarsus pale. 



The outline of the vase-mark from the cephalothorax to the enlarge- 

 ment on the abdomen is very sharp and distinct, and in the darker speci- 

 mens it is bordered with white. Sometimes there is a paler stripe 

 through the vase-mark. 



Locality — Mt. Washington, New Hampshire ; collected by Mrs. 

 Annie T. Slosson. 



NOTES ON A POLYMORPHIC PAPILIO. 



BY WM. H. EDWARDS, COALBURGH, WEST VA. 



For two or three years past Mr. David Bruce, in S. W. Colorado, has 

 been taking Papilio Bairdii in company with a very different form, P. 

 oregonia, as we have called it, and also with the form I described recently 

 as P. Hollandii, which last is in general like Bairdii, but has the abdo- 

 men either with a broad stripe of yellow or almost completely yellow, 

 instead of spotted yellow in rows, as in the Asterias group, and as in 

 typical Bairdii. And from what Mr. Bruce has seen on the ground, he 

 has become satisfied that all these three forms are but one species. It is 

 a remarkable case of polymorphism, the more so that it is not confined to 

 one sex only, and that the two main forms belong to what have been 

 considered two different sub-groups, namely, Bairdii to the Asterias 

 group, and this Oregonia to the Zolicaon and Machaon group. Of course, 

 breeding is the final test in such a case. In 1892, Mr. Bruce obtained 

 a large number of eggs from a $ of Bairdii confined over the food plant. 

 This, by the way, is not one of the umbelliferse, but of the compositse, a 

 strange plant for butterflies of either of these sub-groups to deposit their 

 eggs on, Artemisia dracunculoides. And both these forms lay on it, 

 passing by the umbelliferaa every time. Yet, the larvae in confinement 



