GRAPTA I. 



This goes to show, therefore, that in the first brood from the hibernators the 

 form Umbrosa was produced to the total exclusion of Fabricii. Although this 

 brood was raised but in one instance, we may conclude with much probability 

 that the result in sevei'al instances would be the same, inasmuch as where the 

 species is but two-brooded, the first in descent from the hibernator is Umbrosa, 

 with very rarely an exception. In the second brood Uvibrosa preponderated 

 largely, as 86 to 14, and six lots produced that form only, five lots both forms. 

 In tlie third brood there were fewer Umbrosa, the proportion being as 57 to 4.3, 

 and every lot, whether raised from eggs or from found larvae, was made up of 

 both forms. In the fourth brood all were Fabricii. 



I think it probable that some few of the later individuals of the third brood 

 hibernate. This would account for an occasional Umbrosa seen late in the year 

 or early in tlie spring, and which therefore would be a hibernator. Also it would 

 preserve the species when the fall is cold and unpropitious for the production of 

 a fourth brood, as it appai'ently sometimes is. The season of 1888, at Coalburgh, 

 (luring all September, was cold and wet, and the leaves of Elm and Hackberry 

 fell early in October, so that no larva of a fourth brood could have reached pupa 

 on those plants — and in the fall there are no other food plants. If the species is 

 not extinct the coming spring (1889), it would seem to be becau.se some imagos 

 of the third brood were able to hibernate. 



In Florida there must be at least four full broods of Interrogatlonls, as the 

 sea.son is much longer at each end than in West Virginia. On 28th September, 

 1880, I received twenty-five half-grown lurvte from Indian River, sent by Dr. 

 Win. Wittfeld. These were passing the fourth moult on 8tli October, and be- 

 tween the 12th and 17th November, 16 Fabricii came out, and no Umbrosa. 

 (By an oversight, in Can. Ent., XIV, p. 206, this is stated as 25 instead of 10.) 



Individuals sometimes occur which are intermediate between the two forms 

 of this species. One such I have seen from the collection of Mi.ss Morton, and 

 another I am told is in the collection of Mr. Neumoegen. The shape is of 

 Fabricii, and the color of under sui'face as well, but the hind wings on upper 

 surface have the black of Umbrosa. 



It is interesting to compare the history of a species like the present in several 

 localities, especially with the more northern. In the lowlands of New York, 

 Interrof/atiotiis seems to be three-brooded. Miss Morton says there are three 

 broods at Newburgh. On June 11, 1886, 15 to 20 larvae, one third grown, were 

 found. All the butterflies from tliese, coming out from July 7th to 20th, were 

 Uiiihrosa. This was tlie first brood. All butterflies seen on the wing the last 

 half of August were Umbrosa, a.m\ Miss Morton considered them to be the second 

 brood. All seen the last part of September and in October were Fabricii, the 

 third brood. 



