NORTH AIMERICAN COLEOPTERA, 55 



and very feebly rugulose or undulated ; epipleurae of nearly equal width 

 throughout, not widened abruptly at base. First joint of anterior tarsi not 

 swollen, elongated and narrower than the third, which is strongly bilobed, 

 joints one and three spongy-pubescent beneath. Under surface of the abdo- 

 men very sparsely pubescent. Length 2.6 nun. 



New Jersey; one specimen. 



The only species -with which the above described form can be com- 

 pared is interstitialis Lee, and the differences are so great as to leave 

 no doubt of its distinctness ; it will suffice here to mention one, viz. : 

 the structure of tlie anterior tarsi, the first joint of which is greatly 

 swollen in interstitialis and of normally slender form in extricata. 



P. aenescens n. sp. — Form robust, very convex ; body glabrous, highly 

 polished, brassy-bronze above, abdomen black beneath, f«mora piceous-black, 

 tibiae and tarsi paler. Head moderately convex ; eyes somewhat jjrominent ; 

 interocular surface evenly convex, sparsely and minutely punctate, minutely 

 reticulated ; labrum broadly and feebly emarginate anteriorly, having two 

 distant impressed punctures on the upper surface, which are small, very 

 distinct and setigerous ; antennae one-half as long as the body, reddish- 

 testaceous at the base, becoming dark piceous-brown toward the tip, rather 

 slender, terminal process of last joint very slender and distinct, second joint 

 distinctly longer than the third, and about as long as the fourth. Prothorax 

 distinctly less than twice as wide as long ; apex scarcely one-fourth shorter 

 than the base, both broadly, evenly, nearly equally and rather strongly 

 arcuate; sides very feebly arcuate ; posterior angles acute ; just perceptibly 

 wider than the head anteriorly ; disk strongly convex, distinctly, evenly, 

 and very narrowly margined posteriorly ; punctures somewhat coarse and 

 distant, nearly evenly distributed ; surface also minutely reticulated. Scu- 

 tellum small, angulate behind, sides strongly arcuate, much wider than 

 long, steel-blue in color. Elytra at base very slightly wider than the pro- 

 notum ; disk very convex, widest at one-fourth its length posteriorly, thence 

 gradually narrowed behind, immediate apex very obtusely rounded ; surface 

 very strongly punctate and minutely, though rather strongly, rugulose or 

 undulated ; punctures arranged in rows, having an irregular line of extremely 

 minute punctures between them, distance of the ijunctures in the rows equal 

 to about two-thirds the distance between the latter. Posterior femora very 

 robust, and very rapidly narrowed to the apex ; first joint of the anterior 

 tarsi moderately robust, as wide as the third, which is strongly bilobed. 

 Length 2.1 mm. 



Willets Point, Long Island; two specimens. 



This species differs from interstitialis in the following particulars: — 



In the latter the punctuation of the head and prothorax is closer, 



and the punctures of the pronotum are finer ; the granulation of these 



surfaces is also much more distinct ; the scutellum is smaller and 



narrower ; the punctures of tlie elytra are much less strong and are 



