NORTH AMERICAN BUPRESTID BEETLES 141 



It is recorded from Canada, District of Columbia, Indiana, Massachusetts. 

 Maryland, Missouri, New Jersey, North Carolina, Pennsylvania, Wis- 

 consin, and Wyoming, but some of these records refer to quadriguttatus 

 Gory. 



VaHations. — In the series of specimens examined the length varied 

 from 7 to 11 mm., and the pubescence from whitish yellow to 

 golden yellow. The greatest variation was found in the depressions 

 on the pronotum. In some examples the median depression was mod- 

 erately deep and divided into two parts, whereas in others the an- 

 terior depression was obsolete, but with a small round depression on 

 each side of the median line, and about halfway between the mid- 

 dle and anterior margin. The antennae extend slightly beyond mid- 

 dle of pronotum, serrate from the fourth joint, and the outer joints 

 are about as wide as long. 



Hosts. — This species has been reared from Lombardy poplar 

 (Populus nigra var. italica Du Roi), and cottonwood (Populus del- 

 toides Marshall). It has also been recorded in the literature from 

 Populus trichocarpa Hooker, but so far no adults have been recorded 

 from the region where this species of Populus is found. It is known 

 as the " Lombardy poplar borer " and is recorded as girdling and 

 killing limbs and entire poplar and cottonwood trees. 



Many of the records in the literature under this species, at least 

 in part, refer to quadriguttatus Gory. Agrilus aleus described by 

 Qorj from Columbia 3 has been placed as a synonym of this species. 

 It does not belong to our fauna, and the characters given in the 

 description do not agree with the above species, so it should be 

 dropped from our catalogues as a synonym of granulatus Say. 

 Crotch 4 writes that biguttatus Gory is evidently identical with 

 granulatus Say, but this is probably an error, as biguttatus is a com- 

 mon European species, and is certainly distinct from the American 

 granulatus. 



One male specimen collected by the writer at Harrisburg, 

 Pa., June 25, 1907, has the elytra bluish black, with a distinct 

 greenish and purplish tinge, the surface is nearly glabrous except 

 for the pubescent spots, which are distinct, and a few scattered hairs 

 along the sutural margins near the apex, but otherwise it is typical 

 of the species. 



44. AGRILUS QUADRIGUTTATUS Gory 



Figure 31 



Agrilus quadriguttatus Dbjean, Cat. Coleopt.. ed. 2, 1833, p. 82; ed. 3, 1837, 

 p. 93 (no description ) .—Goby, Mon. Bupr., Suppl., vol. 4, 1841, p. 228, 

 pi. 38, fig. 219.— LeConte, Proc. Acad. Nat. Sci. Phila., vol. 9, 1857, p. 9 ; 

 Trans. Amer. Philos. Soc, vol. 11, new ser., 1859, p. 245. — Kerkemans, 

 Mem. Soc. Ent. Belg., no. 1. 1892, pp. 270, 278. 



8 Mon. Bupr. Suppl., vol. 4, 1841, p. 250, pi. 41, fig. 242. 

 *Proc. Acad. Nat. Sci. Phila., vol. 25, 1873, p. 93. 



