356 ANNUAL REPORT OF NEW-YORK 



PEACH. TRUNK. 



4. THE PEACH.— Pemca vulgaris. 



AFFECTING THE ROOT. 



59. Peach-tree Borer, Trochilium exitiosum, Say. (Lepidoptera. Trochi- 

 liidae.) [Plate I, fig. 6 the male, fig. 7 the female.] 



Boring in and eroding the bark and solid wood, causing the gum 

 to exude so copiously as to form a thick mass around the root 

 intermingled with the castings of the worm, which is cylindrical, 

 soft, white, with a tawny yellowish red head and sixteen feet, and 

 grows to more than half an inch in length. It forms a tough 

 ^od-like cocoon on the side of the root, jutting slightly above the 

 surface. The moth comes abroad the last half of July and in 

 August, and resembles a wasp in its appearance. It is of a dark 

 steel blue color, and in the male the wings are clear and glassy 

 with a dark blue band extending nearly across the forward pair 

 beyond the middle, whilst in the female only the middle of the 

 hind wings are clear and glassy and her abdomen has a broad 

 bright orange yellow band upon its middle. Width 0.80 to 1.30. 

 See Transactions, 1854, p. 813. 



This important insect is so well known throughout our country 

 under the technical name Mgeria exitiosa that it is unfortunate 

 this term cannot remain undisturbed. But so long ago as 1777 

 Scopoli gave the name Trochilium to the same insects for which 

 the Fabrician name Mgeria was published thirty years afterwards. 

 The latter name, therefore, is merely a synonym of the former, 

 and is wholly rejected by the latest and best authorities. 



AFFECTING THE TRUNK AND LIMBS. 



Apple Buprestis, a flattened pale yellow grub under the bark 

 mining in the sap wood. See No. 3. 



Divaricated Buprestis, a worm similar to the preceding and 

 found in the same situation. See No. 71. 



60. Elm bark-beetle, Tomicus liminaris, Harris. (Coleoptera. ScolytidsD.) 



Small perforations like pin holes appearing in the bark particu- 

 larly of diseased trees, from which in August and September 



