50 



the second molt, three days, and from the second molt to the time of 

 spinning the cocoon, live days. Several individuals which were kept 

 under observation at this office transformed from larva to pupa June 

 23, and the moths issued July 4, having passed eleven days as pupa?. 

 Of the number of generations of this insect Mr. Coquillett observed 

 that there appeared to be only two broods in a season in the latitude of 

 Woodstock, 111., and Professor Comstock says there are certainly two 

 and perhaps three broods in a season. The writer's observations tend 

 to show at least three well-marked generations for the latitude of the 

 District of Columbia, the first generation usually developing toward 

 the middle of June, the second early in August, and the third some- 

 time late in September or early in October. There is no indication, 

 however, of any great regularity in the issuance of the moths, since 

 they have been reared at this office at various other times than on the 

 dates mentioned. The exact dates of issuance as recorded in our 

 notes are: June 12. 15, 23, 28, 30; July 1, 8. 16; August 1: Septem- 

 ber 2, 5, 6, 25, 27. Moths, however, as has previously been observed, 

 have been found much earlier than in June and as late as the first week 

 of December, at the latter time on several occasions, once when the 

 thermometer registered 51° F. 



NATURAL ENEMIES. 



A single parasite was reared from the pupa of this moth September 

 7, 1S99, and on being referred to Mr. Coquillett was identified as the 

 the Tachinid fly. Exorista Hondo O.-S. This is the second natural 

 enemy that has been observed for the green clover worm to the 

 writer's knowledge, the other being a chalcis fly. Ewplectrus platyhy- 

 pence How. The latter was reared at this office July 11. 1882, from 

 material from the District of Columbia. (Bui. 5. o. s. , Div. Ent. . p. 27.) 



REMEDIAL TREATMENT. 



Ordinarily the injuries effected by this clover worm are so inconsid- 

 erable as not to necessitate any special line of treatment. It is one of 

 several common insects that live habitually on clover and which by 

 their combined effort devour a certain proportion of the clover crop 

 over considerable territory. Poisons are. of course, out of the ques- 

 tion in pasture land and in clover fields, and on lawns there can be 

 little doubt that frequent mowing with a lawn mower is all that is 

 necessaiw, since the insects live freely exposed upon their food plants 

 during the day and do not resort to the plans of concealment resorted 

 to bv cutworms. 



