NORTH AMERICAN BUPRESTID BEETLES 119 



35a. AGRILUS BILINEATUS subspecies CARPINI Knull 



Agrilus bilineatus var. azureus Knull, Canad. Ent., vol. 54, 1922, p. 84 

 (nuine preoccupied). 



Agrilus bilineatus var. carpmi Knull, Canad. Ent., vol. 55, 1923, p. 105; 

 Ohio State Univ. Studies, vol. 2, no. 2, 1925, p. 44, pi. 9, fig. 2.— Cham- 

 beblin, Cat. Buprestidae, 1928, p. 55. 



Agrilus bilineatus (Weber) Morris, 47th Rept. Ent. Soc. Ontario for 1916 

 (1917), p. 22; Canad. Ent., vol. 51, 1919, p. 52, (probably this sub- 

 species). 



Male. — Form resembling a typical specimen of bilineatus; head 

 bronzy green on the front, becoming brownish black on the occiput, 

 pronotum brownish black at the middle, becomingly narrowly bronzy 

 green toward the lateral margins, where the surface is sparsely clothed 

 with short, recumbent, golden yellow hairs; elytra bright cyaneous 

 blue, with a spot of short, recumbent, golden yellow hairs in the 

 basal depressions, and a vague vitta of shorter whitish hairs along 

 the sutural margins at apical fifth; beneath olivaceous green, with 

 the episternum, external side of posterior coxae, and the vertical por- 

 tions of the abdominal segments densely clothed with short, recum- 

 bent, golden yellow hairs. Genitalia the same as in bilineatus Weber. 



Length, 8 mm. ; width, 1.9 mm. 



Redescribed from the male type in the collection of J. N. Knull, 

 which was reared June 2, 1920, from blue beech (Garpinus carolini- 

 ana Walter). 



Type locality. — Hummelstown, Pa. 



DISTRIBUTION 



Material examined : 

 Connecticut: Lyme (W. S. Fisher). 



Pennsylvania: Philadelphia, June (F. M. Trimble and J. K. Primm) : Hum- 

 melstown (J. N. Knull). Harrisburg (Champlain and Knull). 



Variations. — This subspecies is rather uniform in size, but con- 

 siderable variation was found in examining a series of male and 

 female paratypes reared or collected on blue beech at Philadelphia, 

 Pa. Some specimens have the elytra bright cyaneous blue, whereas 

 in others it is nearly black with a feeble greenish tinge. The pubes- 

 cence is always visible in the basal depressions, and sometimes along 

 the sutural margins near apex, and varies from a golden yellow to a 

 yellowish white color. In a series reared from ironwood (Ostrya 

 virginiana (Miller) Koch) at Lyme, Conn, by the writer, there are 

 indications of a vague pubescent vitta on each elytron on a few of the 

 examples, whereas in others it is absent except in the basal depres- 

 sions. Length 6.25 to 8 millimeters. 



Hosts. — Breeds in living beech {Fagus grandifolia Ehrhart, syn. 

 F. americana Sweet), blue beech {Garpinus caroliniana Walter), and 

 ironwood or hop-hornbeam (Ostrya virginiana (Miller) Koch). 



