The Peach-Teee Barer. 197 



of these emerged August ITtli and was determined by Mr. Aslimead, 

 through the kindness of Dr. L. O. Howard, as Ej>hialtes irritator 

 Fab. This Ichneumon flv has not been before recorded as a 

 parasite of the peach-tree borer. From the remaining cocoon, there 

 emerged on August 21st, the same Ichneumon parasite — Phaeogenes 

 ater — which was found at work on the pest in Missouri in 1872, as 

 noted above. 



The following insects are thus known to be enemies of the peach- 

 tree borer : Phceogenes ater, Ephialtes irritator, Bracon n. sp., 

 Bracon nigropictus, Bracon mellitor, Microgaster sp., and t\\o 

 Chalcids ; whether the Kansas Braconid is a species distinct from 

 any of the above, we do not know. The grub of the first species 

 devours, or is parasitic upon the pupa, while all the others appar- 

 ently feed upon the larva? of the peach-tree borer. 



The fact that, from two of the four cocoous collected from plum 

 trees at Geneva, N. Y., parasites emerged, would indicate that in 

 some localities the enemies of the peach-tree borer may play cpiite 

 an important part in checking the normal increase of the pest.* 



* Sometimes minute white larvae are found in the gumraj^ mass exuded from 

 peach trees infested by borers. These white "worms" are not enemies of the 

 borer, and they develop into a Fungous-gnat (Mycetophila persicse). See Am. 

 Ent. I, 223 (1869); Glover's Kept, of U. S. Ent. for 1872, p. 114; Lintner's 2nd 

 Kept., p. 6 (1885). The worms probably feed upon the gum or some decaying 

 matter in it. 



