83 



AETICLE IL— ON A FEW GRAPE INSECTS. 



1. Petrophora divers ilitieata, Hiibn. 



This insect, well known as injurious to the grape, has here- 

 tofore been considered single brooded (except possibly in extreme 

 southern latitudes) and supposed to winter in the larval stage, but 

 an observation made last year indicates that it is double brooded 

 in Southern Illinois. 



Larvae collected on the grape in Union county, September 13, 

 1884, were found in the imago stage in the breeding cage February 

 7, 1885, although the date of their appearance is not known. In 

 Dr. Packard's Monograph of the Phalsenidse of North America, the 

 occurrence of the imago is recorded in New York and Massachusetts 

 from July 3 to August 17, and our autumnal larvae must conse- 

 quently have been the descendants of that brood. 



2. The Vine- loving Fruit Fly. 



{Drosophila ampelophila, Loew.) 



Order Diptera. Family Drosophilid^. 



(Plate IX. Figs. 1-3.) 



From Mr. A. Williams, of Moline, Illinois, I received, October 10, 

 a bunch of grapes containing great numbers of a white footless 

 maggot by which most of the berries had been hollowed out, with 

 the information that this insect was making havoc with most of the 

 grapes in his vicinity. These specimens were bred and yielded great 

 numbers of the above common pomace fly — one of the most abun- 

 dant species in orchards in autumn, when the fallen fruit is rotting 

 upon the ground. This fly likewise swarms around cider mills, the 

 larvae breeding in vast numbers in the pomace. 



In a later note Mr. Williams remarks : "This maggot has nearly 

 ruined the entire crop in this locality. It began on the vines about 

 four years ago." 



This species, first described in 1862 by Loew, has been sev- 

 eral times noticed by economic entomogists, — chiefly by Lintner 

 and Comstock, the former of whom published an article 

 upon it in his first report as State Entomologist of New 



