NORTH AMERICAN BUPRESTID BEETLES 155 



cells in river birch (Betula nigra Linnaeus) at Plummer Island, Md., 

 on April 23, 1905, by A. D. Hopkins. The pupal cells were common 

 in the outer sapwood of small trees, which evidently had died the 

 previous summer. One male paratype received from Warren Knaus, 

 and labeled " Fairfax County, Virginia, June 20, 1912." 



This species is closely allied to pensus Horn and anxius Gory, but 

 is more slender posteriorly than either of these two species, the upper 

 surface is of a different color, and the males have the head densely 

 pubescent in front. 



49. AGRILUS PENSUS Horn 



Agrilus pensus Hobn, Trans. Anier. Ent. Soc, vol. 18, 1891, p. 305. — 

 Gibson, 43d Rept. En!. Soc. Ontario for 1912 (1913), p. 216 (sepa- 

 rate p. 14). — Fbost, Canad. Ent., vol. 47, 1915, p. 144. — Nicolay, Ent. 

 News, vol. 30, 1919, p. 277.— Frost, Canad. Ent., vol. 52, 1920, p. 27 — 

 Fbost and Weiss, Canad. Ent.. vol. 52, 1920, p. 209. — Knuix, Canad. 

 Ent., vol. 54, 1922, p. 84 ; Ohio State Univ. Studies, vol. 2, no. 2, 1925, 

 pp. 45-46. — Ckambeblin, Cat. Buprestidae, 1926, p. 76. 



Male. — Form similar to that of anxius Gory, slightly flattened 

 above, and feebly shining; head bronzy green, becoming brownish 

 cupreous on the occiput ; pronotum and elytra dark reddish cupreous, 

 sometimes with a feeble blackish green tinge; beneath reddish 

 cupreous, the legs more or less greenish, and more shining than 

 above. 



Head with the front rather narrow, feebly, broadly depressed on 

 vertex and occiput, about equal in width at top and bottom, the 

 lateral margins feebly, broadly constricted near bottom, arcuately 

 expanded at vertex, and with a narrow, longitudinal groove extend- 

 ing from the occiput to middle of front; surface coarsely, densely 

 punctate on the front, becoming somewhat longitudinally rugose on 

 the occiput, and rather sparsely clothed with long, recumbent, 

 whitish hairs, which are slightly denser on lower half; epistoma 

 slightly transverse between the antennae, and broadly but not deeply 

 arcuately emarginate in front; antennae extending slightly beyond 

 middle of pronotum, serrate from the fourth joint, and the outer 

 joints as wide as long; eyes large, strongly elongate, and equally 

 rounded above and beneath. 



Pronotum one-half wider than long, base and apex about equal 

 in width, and widest at middle; sides arcuately rounded from apical 

 angles to near base, where they are feebly sinuate; when viewed 

 from the sides the marginal and submarginal carinae are sinuate 

 rather narrowly separated anteriorly, and connected to each other at 

 or near the base; anterior margin feebly sinuate, and the median 

 lobe feebly, broadly rounded; base feebly, broadly emarginate at 

 middle of each elytron, the median lobe broadly rounded, and sub- 

 2305—28 11 



