206 THE CANADIAN ENTOMOLOGIST. 



The last brood in Florida, if I may judge by 25 Fabricii which 

 emerged from chrysalis, at Coalburgh, in November, 1880, the larvae 

 received from Indian River, as before related, would be all Fabricii. It 

 would seem therefore that the species is strictly seasonally dimorphic, the 

 last brood producing Fabricii., the hybernating females producing Ui>ibrosa, 

 but the intervening broods, like the second brood of Comma, producing 

 both forms, but with a majority of individuals Umbrosa, or the summer 

 form. This is what might have been expected, when the species became 

 polygoneutic, as the interpolated broods are summer broods. The winter 

 brood holds its own, the summer broods after the first, or original one, are 

 made up of both forms. 



In the case of the single Umbrosa seen in early spring, of which I 

 have spoken, this may have been an exceptional member of the 4th 

 brood, or a hybernating member of the 3rd. 



The larvae, as before described, are very variable. That is, they also 

 are polymorphic, and they may readily be separated into 3 or 4 distinct 

 types, as thus : 



I. Body black, finely specked with yellow ; no longitudinal lines on dor- 

 sum or upper part of side. 

 a. Body black, with small spots in place of the specks or dots, the longi- 

 tudinal lines more or less conspicuous, and either yellow or red, or 

 mixed. 

 3. Body russet, much covered with yellow spots, giving a pepper and salt 

 appearance, the lines often obsolete. 

 There are intermediate variations, and there is a great variety in the 

 color of the spines, from deep red and red bases, to yellow, or mixed. 



The larvae from Florida were of one of these types only, No. 2, and 

 especially were there none of the russet variety. 



The food plants of Inferrogatio?iis are Hop, Nettle, False Nettle, 

 (Boehmeria cylindrica,) Elm, Celtis, and in W. Va. they may be found on 

 all these plants at the same season of the year. But the preference is for 

 Hop and Elm, the first early in the season, the other in August and Sep- 

 tember. I have near my house many Elm sprouts which are cut down 

 every year, to be replaced in a few weeks by a fresh growth. It is on the 

 tender terminal leaves of these that the female chooses to lay her eggs, 

 either singly or in strings of from 2 to 5 or 6, on the under side of the 

 leaf usually. The egg is not correctly represented in But. N. A,, although 

 copied from a drawing made by so good an artist as Mr. Konopicky. It 



