The Peacii-Trek Barer. 197 



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

 through the kindness of Dr. L. O. Howard, as Ephialtes irritator 

 Fab. This Ichneumon llv lias not been before recorded as a 

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

 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 tlms known to be enemies of the peach- 

 tree borer : PhcBogenes atei\ Ephialtes irritator^ Bracon n. sp., 

 Bracon nigropictus^ Bracon inellitoy\ Miorogaster sp., and two 

 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 tlie pupa, while all the others appar- 

 ently feed upon the larvae of the peach-tree borer. 



The fact that, from two of the four cocoons 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 gummy 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 persicae). 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. 



