8 BULLETIN 914, U. S. DEPARTMENT OF AGRICULTURE. 



kept with others in a warm room. There is a singular agreement 

 in the times of pupation and issuance of the specimens at Washing- 

 ton and in Missouri, and of the one individual observed from New- 

 ark, N. Y. 



In the District of Columbia, and probably elsewhere as well, 

 hibernation takes place exclusively in the pupal state. 



From the facts that larvae have been observed in the open on May 

 15, that pupae have been found as early as the second week in June, 

 and that moths have issued during the third week, it was readily 

 surmised that the moths which have hibernated as pupa? appear some 

 time in April and lay eggs for the first generation. The moth was 

 collected during the latter days of April in 1900. 



The moths from the first new generation emerge for the most part 

 during the second and third weeks of June, and of the next generation 

 the last of July and the first two weeks of August, the third genera- 

 tion developing in October and early November and wintering as 

 previously mentioned. 



It seems to be fairly certain that there are at least two, and prob- 

 ably three generations annually in a climate like that of the District 

 of Columbia and Missouri, and probably no more than two in a more 

 northern latitude like that of the New England States. 



From a female captured June 14, eggs were obtained in two masses 

 of about 45 and 65 respectively upon the two following days, and the 

 larvae hatched in 11 days. The weather was rather cooler than sea- 

 sonable during this time. A portion of the eggs were placed in a 

 large rearing jar with growing strawberry plants, and the imago 

 obtained July 23, the larval and pupal stages having been passed in 

 28 days. The weather was extremely hot (80° to 90° F. indoors) dur- 

 ing the latter portion of this period, and the pupal stage must have 

 been about 6 days, which would give 22 days or about 3 weeks as the 

 larval period. 



Of the larvae which were collected in the vicinity of the District of 

 Columbia in October, 1919, all had transformed to pupae by the mid- 

 dle of November and the first moth issued April 15 of the following 

 year, others continuing to issue for a few days thereafter. April 19 

 an imago was captured at light in the open. 



It will thus be seen that the pupal or resting stage of this species 

 for the District of Columbia and vicinity is an even 5 months, leaving 

 7 months for the active or working periods of the species. 



HISTORY OF THE SPECIES. 



The species was given its specific name in 1863 by Walker (1)\ 

 who described it under the name of Cacoecia (?) velutinana* 



2 Italic figures in parentheses refer to " Literature cited," p. 13. 



