32 B. C. ENTO.MOLOGICAL PROCEEDINGS, 1911. 



In both cases the imajies bear a superficial resemblance to each 

 other, but an.vone well acquainted with the insects would have no diffi- 

 cult) in separating them. The greatest difference, however, lies in the 

 time of appearance and also in the early stages of the insects. To take 

 the time of appearance first, fasciata is on the wing from the end of 

 September to about the middle of October, and just when it is getting 

 worn and over, iinprovisa puts in a first appearance quite freshl) 

 emerged ; and continues for a fortnight or so after fasciata has practically 

 disappeared. In some years, however, the two species overlap a little. 



With regard to o\a : at the present time I have eggs from both 

 species — fasciata laid 9th to 12th October — iinprovisa laid 23rd to 28th 

 October. Perhaps it would be plainer to contrast the other special dif- 

 ferences of the ova in separate columns. 



Fasciata. Improvisa. 



1. Laid singly and promiscuously 1. Laid end to end regularly (in 

 attached (lengthwise) to box. lines containing varying num- 



2. Shape, cylindrical, with round- bers of eggs) like strings of 

 ed ends ; about one-third longer elongated beads, and attached 

 than broad. Length, half a firmly to box. 



line. Breadth one-third of a 



r c„ I t J •»! 1 • -• The same, but the. size consid- 



Ime. sculptured with longi- 



^ 1- 1 . • ,-■ ^ I erably smaller and with tlie 



tudinal stnations, strongly . . 



1 J ' striations not so pronounced. 



3. Color (after the first few da\'s 3. Greenish yellow at first, after- 

 when they were the usual wards purplish brown with a 

 greenish yellow), medium greenish tinge, like bloom on a 

 brown with a somewhat irrides- plum. Not as irridescent as 

 cent purplish tinge. fasciata. 



So far as the egg stage is concerned, the foregoing may be relied 

 upon to apph to the respective species. 



With regard to the larvae, the following descriptions are taken from 

 my notebook for 1908, in which year I possessed examples of both spe- 

 cies, but they all died when nearly full grown, so that I cannot positively 

 say which was which. Assuming, however, that the earlier larva turned 

 to the earlier moth {fasciata) and the later larva to the later moth 

 (B. improvisa) , the following notes would hold good: 

 B. fasciata, Barnes and McDunnough. 



Lar\a (nearly full fed) beaten from wild cherry. May 8th, 

 1908. Color, dirt\' brown, underside lighter, a central lighter 

 band runs from the head to anal segment where it ends in a point 

 cut off by a transverse chocolate colored line. This marking is the 



