NORTH AMERICAN BUPRESTID BEETLES 133 



at the apex, whereas in quadriimpressus the lateral lobes are nearly 

 parallel to the tips, which are not acute, and the median lobe obtusely 

 rounded at the apex. One example collected by the writer at Lyme, 

 Conn., is placed with this species temporarily, but it differs from 

 auricomus in having the pubescence on vertical parts of abdomen 

 white, and the color uniformly olivaceous, in which respect it resem- 

 bles olivaceoniger, but lacks the uniformly distributed white hairs 

 on the elytra. 



41. AGRILUS QUADRIIMPRESSUS Ziegler 



Agrilus quadjriimpressus Ziegler, Proc. Acad. Nat. Sci. Phila., vol. 2, 1845, 

 pp. 267-268.— Henshaw, Canad. Ent., vol. 17, 1885, p. 131. 



Agrilus acutipennis Horn, Trans. Amer. Ent. Soc, vol. 18, 1891, pp. 307-308 

 (part). — Chamberlin, Cat. Buprestidae, 1926, pp. 47-48 (part). 



Male. — Form rather robust, feebly shining, and slightly flattened 

 above; head green or aeneous, sometimes with a feeble cupreous re- 

 flection; pronotum and elytra varying from olivaceous to black, with 

 a more or less distinct aeneous, greenish, or bluish tinge ; beneath more 

 shining than above. 



Head with the front rather wide, nearly flat, distinctly narrower at 

 bottom than at top, more or less deeply impressed on the occiput 

 and vertex, lateral margins obliquely expanding from base to middle 

 where they are arcuately rounded, and with a narrow, longitudinal 

 groove extending from the occiput to middle of front ; surface densely, 

 coarsely punctate, more or less rugose, and sparsely clothed with 

 moderately long, semierect, cinerous hairs; epistoma rather narrow 

 between the antennae, and broadly, arcuately emarginate in front; 

 antennae extending to middle of pronotum, serrate from the fourth 

 joint, and the outer joints as wide as long; eyes large, and about 

 equally rounded above and beneath. 



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

 in width, and widest near middle or apical third; sides rather 

 strongly, arcuately rounded ; when viewed from the side the marginal 

 and submarginal carinae are strongly sinuate, narrowly separated 

 anteriorly, and connected to each other at base ; anterior margin 

 moderately sinuate, with a broadly rounded median lobe ; base rather 

 strongly emarginate at middle of each elytron, the median lobe 

 broadly rounded, and subtruncate in front of scutellum ; disk convex, 

 with a broad, moderately deep depression in front of scutellum (some- 

 times with two small, vague depressions placed transversely on an- 

 terior part of disk), a small depression on each side along base near 

 posterior angle, a broad, deep one along the lateral margins, and 

 without prehumeral carinae; surface coarsely, densely, transversely 

 rugose, finely punctate between the rugae and toward the lateral 

 margins, without distinct pubescence, except sometimes with a few 



