2 BULLETIN 887, U. S. DEPARTMENT OF AGRICULTURE. 
HISTORY AND DISTRIBUTION. 
The pear borer is a native American insect that was first described 
by Dr. Thaddeus W. Harris 2 in 1830. It is rather widely distributed 
in the eastern part of this country, having been recorded from the 
following States: Maine, New York, New Jersey, Pennsylvania, 
Michigan, Maryland, West Virginia, Virginia, North Carolina, South 
Carolina, Georgia, Mississippi, Alabama, Missouri, and Texas. The 
species no doubt occurs in several States not included in the fore- 
going list. 
SYNONYMY. 3 
Aegeria pyri Harris, New England Farmer, v. 9, 1830, p. 2; Amer. Journ. Arts & 
Sciences, v. 36, 1839, p. 313; Ins. Inj. Veget., 1841, p. 235; ibid, 2d ed., 1852, 
p. 256; ibid., 3d ed., 1862, p. 335; Harris's Corresp. (Scudder), 1869, p. 361; 
Walker, Cat. Lepid. Brit. Mus., Pt. VIII, 1856, p. 45; Packard, Guide Study 
Insects, 1869, p. 278 (and other editions); Thomas, 1st Kept. Nox. Ins. Illinois, 
1876 (1878), p. 40; ibid, 2d Kept. 1877 (1878), p. 170; Stout, Rept. Kansas 
Hort. Soc. 1879 (1880), p. 88; Martin, Thomas's 5th Rept. Nox. Ins. 111. 1880 
(1881), p. 107; Kellicott, Can. Ent., v. 13, 1881, p. 8; Grote, Check List N. 
Am. Moths, 1882, p. 12; Weed, Am. Nat., v. 23, 1889, p. 1108, fig.; TJ. S. 
Dept. Agr., Div. Ent., Ins. Life, v. 4, 1891, p. 34; Saunders's Ins. Inj. to Fruit, 
1883, p. 140, fig. 146; ibid., 2d ed., 1889, p. 140; Riley, Proc. Ent. Soc. 
Wash., v. 1, 1888, p. 85; Beutenmuller, Ann. N. Y. Acad. Sci., v. 5, 1890, 
p. 204. 
Trochilium pyri Fitch, 3d Rept. Nox Ins. N. Y., 1856, p. 349; Morris, Synop. Lepid. 
N. Am., 1862, p. 141. 
Sesia pyri Boisduval, Suites a Buffon, Nat. Hist. Lepid. Het., v. 1, 1874, p. 440; 
Smith, Cat. Ins. N. J., 1890, p. 289; Beutenmuller, Bui. Am. Mus. Nat. Hist., 
v. 8, 1896, p. 139; ibid., v. 9, 1897, p. 220; Beutenmuller, Memoirs Am. Mus. 
Nat. Hist., v. 1, Pt. VI, 1901, p. 297. 
Aegeria koebelei, Henry Edwards, Papilio, v. 1, 1881, p. 196; Grote, New Check List 
N. Am. Moths, 1882, p. 12; Beutenmuller, Bui. Am. Mus. Nat. Hist., v. 4, 
1892, p. 173. 
FOOD PLANTS. 
Larvse of the pear borer have been found commonly attacking pear 
and apple. Dr. J. B. Smith 4 records mountain ash (Soi^bus ameri- 
cana) as a host plant. The writer has found the larvae attacking 
juneberry (Amelanchier canadensis) and thorn (Crataegus sp.), and in 
black knots caused by PlowrigJitia morbosa on wild and cultivated 
cherrv (Prunus spp.). 
NATURE OF INJURY. 
Injury is done by the larvae feeding in the bark (PL II, B), the bur- 
rows occasionally extending slightly into the sapwood. In infested 
orchards particular trees on which the moths deposit most of then 
eggs year after year usually occur. This preference for certain trees 
2 Harris, T. W., Insects. In New England Farmer, v. 9. (1830-31), no. 1, p. 1-2, July, 1830. 
3 The writer desires to express his thanks to Messrs. P. W. Mason and August Busck, of the Bureau of 
Entomology, for compiling and approving the synonymy as presented, and to Mr. Mason for supplying 
notes on the history, distribution, and food plants of the species under consideration. 
* Surra, J. B. Report of the Insects of New Jersey. In Ann. Rept. N. J. Sta. Museum for 
1909, p. 519. 1910. 
