41 



In 1883 Dr. J. B. Smith, then an agent of this Division, in a report on 

 hop insects published in Bulletin 1, first series of this Division, gave a 



somewhat lengthy account of the species, illustrated by three figures 

 of the results of its work. 



In 1885 Dr. J. A. Lintner, in his second annual report as State ento- 

 mologist of New York, published a brief article ou the species. 



Finally, in his report as entomologist and botanist to the experimen- 

 tal farms of the Dominion of Canada for 1892, Dr. James Fletcher 

 presented an article on the species, illustrated by an excellent figure 

 of the adult moth, and bringing together a short account of previous 

 writings, introducing some interesting facts from certain of his corre- 

 spondents. Neither Dr. Fletcher nor Dr. Lintner was acquainted with 

 Professor Comstock's American Agriculturist article. 



GEOGRAPHICAL DISTRIBUTION. 



Hydroecia immanis is a Xorth American insect. It has not yet made 

 its appearance in the hop-growing regions of the Pacific Coast, although 

 in Smith's Catalogue of the Noctuidae it is recorded from Washington. 

 It occurs in different parts of Ontario, abundantly through Xew York, 

 less so through the Xew England States, and south to the District of 

 Columbia, spreading west through Wisconsin. The moth has fre- 

 quently been taken at light in Illinois by Professor Wescott, at May- 

 wood, and Mr. Worthington, at Chicago, and is recorded by Dr. Smith 

 from Colorado. Our data do not inform us as to any wider range, but 

 it is probable that it is a northern form, and confined, as it seems to 

 be, to a single food-plant, it will be found only where this plant is known 

 to grow. 



NATURAL HISTORY. 



From full-grown larvse and chrysalides of the species taken in hop 

 fields near Utica, X. Y., by Dr. Smith in the last week of July. 1883, 

 we reared the first moth on August 8 of the same year. The specimens 

 originally received by Mr. Bethune were taken June 27, 1868. When 

 received the majority of them were about two-thirds grown, judging 

 from the measurements which he publishes. Professor Comstock's 

 experience with the insect indicates that the young larva' can be found 

 early in May working in the young shoots. They become full grown, 

 he says, the latter part of July, and at this time or early in August 

 they transform to pnpae in the ground near the roots which they have 

 infested in their later stages. According to this author the pupa state 

 lasts about one month, which would bring the adult insect out at the end 

 of August or the first of September. According to Dr, Smith's account 

 in Bulletin ^So. -4 of this Division, the egg, which is globular in shape 

 and about the size of a pin-head and yellowish-green in color, is depos- 

 ited by the female upon the tip of the hop vine when it begins to climb. 

 The young larva 1 are slender and greenish in color, spotted with black. 

 They bore immediately into the vine .just below the tip. and remain at 



