107 



the second generation, emerged from pupa^ in a})out ten da^^s after 

 the larvte transformed. One of the hirvte captured in 1SU9 became 

 full fed Jul}' 8, entered the earth the following day, and issued as 

 moth July 22. Assuming the pupal stage to have lasted ten days, three 

 days were passed b}- the larva in inaction. 



It is obvious from the above that we have two well-marked genera- 

 tions and there is evidence also of a third generation, of few individuals. 

 Although the earliest appearance of the moths in the Held was not 

 noted, it is fairly certain that they begin to issue from the pupa? of the 

 over-wintered larvjv during the latter half of May and continue into 

 June, depositing their eggs at this time for the first new generation, the 

 moths of which appear during the last week of July and the first week 

 of August. From the larvie of the second generation cocoons were 

 obtained August 14. In other words, larvie had reached full growth 

 early in the second week of August, and one lot had already entered the 

 earth and spun up l)y the end of the second w^eek. It has already been 

 shown that larvffi of the second generation pass the winter in their 

 cocoons, form the pupal condition in May, and aljout ten days after 

 transforming issue as adults. There is evidence that a very small per- 

 centage of these, however, issue late in August and la}' eggs for a 

 small third generation, the larvse of which have been observed by Mr. 

 Keleher and the writer at the end of September and during the first 

 week of October. 



From the observed food plants it is obvious that we may expect 

 attack in the future on several other plants. The present list includes 

 morning glory, spearmint, peppermint, plum, sunflower, dahlia, and 

 hogweed, plants of different botanical families. 



NATURAL ENEMIES. 



From the first generation of this insect a number of individuals of 

 a parasitic Dipteron of the family Tachinidie were reared, all of which 

 evidently came from the cocoons. The species was referred to Mr. 

 Coquillett, who identified it as Ilypostena floridensls Towns. Flies 

 issued during the last week of July. This species, as its name shows, 

 occurs in the South. Its known distribution extends from the White 

 Mountains of New Hampshire to Jamaica, W. I. It has previously 

 been recoi'ded as a pai'asite of Blastohasis nuhilella Zell. and ScMzocera 

 ehena Nort. 



A n3'mph of the spined soldier-bug {Podisu>t spinosHS Dall.) was 

 o))served by Mr. Keleher in the act of attacking a full-grown larva 

 of this species the last week of September. 



REMEDIES. 



The earlier stages of this insect can doul)tless bo reached by a spray 

 of Paris green or oi/her arsenical, as to a certain extent also the latter 



