' AMERICAN LEPIDOPTERA. 9 



striped larvre came 3^39 Tnterrogalionis. But from striped larvae, in 

 no way distinguishable from the latter, came 1 S 2 9 Fahricii, and frum 

 speckled larvjvj came 1 S 1 9 Ii'terro'jatlonls. 



So that it appears while the striped larvae usually indicate Fahricii 

 and the speckled Interrogationis, there are casos exactly the reverse. 

 In previous seasons I had found the same result. I am not sure that 

 there was any difference in the shape of the eggs of the two species, 

 though sometimes I thought I discovered that those of Interroyutionis 

 were equally large at either end, those of Fahricii Vicxe. largest at base. 

 But I had not a glass of sufficient power to settle the point. 



The chrysalids of the two species I was unable to distinguish. They 

 are well described by Dr. Harris as ''ashen brown, with the head 

 deeply notched and surmounted by two conical ears, a long and thin 

 nose-like prominence on the thorax, and eight silvery spots on the 

 back." Except in shades of color, some being more ashen and some 

 more brown, I could distinguish no difference. This is more noticeable 

 because the characteristics are CDUspicuous . It was on account of these 

 resemblances that Boisduval and Leconte considered the two species 

 as one. Yet, without any doubt, they perpetuate their kind, and are 

 to be judged specifically distinct . 



The larvae of Comm<t bear no close resemblance to those of the two 

 larger species, and the chrysalids are quite distinct; which is remarka- 

 ble, considering the resemblance of the butterflies. The three species 

 together with Drijas maybe regarded as having sprung from a comuion 

 type, very near to or identical with Jnfery'ogationis, from which Comma 

 and Drj/as first diverged, to be followed by Fahricii, the latter not yet 

 wholly separated from the parent stem, as the similarity of the chrysa- 

 lids and the occasional interchangable forms of the larvae show. 



I intend figuring all these species with the larva3 in a subsequent 

 number of the Butterflies of North America, and shall be obliged for 

 any assistance lepidopterists can render me in making their history 

 more exact and complete. 



Tn.VNS. AMER. ENT. SOC. (2) JAKUARY, 1870. 



