^7 



375. 

 SERROCERUS PECTIN AT US. 



Order Coleoptera. Fam. Ptinidae. 



Type of the Genus, Ptilinus pectinatus Fab. 



Serrocekus Kugel.,Gyl.,Curt. — Xyletinus hat., Dej. — Ptilinus Fab., 

 Panz., Gyl. — Dermestes Mars. 



Antennce nearly alike in both sexes, inserted before the eyes at 

 the base of the mandibles, a little longer than the thorax, beneath 

 which they are concealed when at rest, compressed, pubescent, 

 1 1 -jointed, basal joint clavate, 2nd the smallest, subglobose, the 

 remainder obtrigonate, being produced at the apex on the inside, 

 excepting the terminal joint which is the longest and elliptical (6). 

 Labrum suborbicular, truncated anteriorly and ciliated (1). 

 Mandibles subtrigonate, dilated and rounded externally at the 

 base, furnished with 3 teeth on the inside, at the apex (2). 

 Maxillce terminated by 2 lobes, the internal rather small and 

 fringed with short hairs, the external much larger, trapezate and 

 densely ciliated. Palpi a little longer than the labial, 4-jointed, 

 basal joint minute, 2nd long subclavate, 3rd short, 4th rather 

 longer than the 2nd, robust, somewhat elongate-ovate (3). 

 Mentum subtrigonate, the angles and apex rounded. Labium 

 quadrate at the base, producing two narrovv divaricating and pu- 

 bescent lobes. Palpi attached near the sides of the lip, triarti- 

 culate, basal joint minute, 2nd and 3rd nearly of equal length, 

 the former subclavate, the latter hatchet-shaped (4). 

 Head broad and deflexed. Eyes small and lateral. Thorax short, broad 

 and convex, the sides slightly reflexed. Scutellum small. Elytra 

 broader than the thorax, ovate. Wings ample. Legs short. Thighs 

 slightly thick. Tibiae rather long, with a minute spur at the apex. 

 Tarsi composed of 5 somewhat obtrigonate joints, basal rather the 

 longest, 3rd and 4th the shortest, 5th obovate. Claws minute (5, a 

 fore leg; ^the same tarsus viewed above). 



Pectinatus Fab. Ent. Syst. 1. 244. 4.— Curt. Guide, Gen. 288. 



Piceous-black, slightly glossy, partially clothed with exceedingly 

 short ochreous pubescence : antennae with the two basal joints 

 rufous : head and thorax very minutely reticulated, slightly keeled 

 before the scutellum : elytra sometimes dull castaneous, with 12 

 deep and punctured furrows on each, the sutural one abbreviated, 

 the interstices transversely striated : legs pale rufous. 



In the Author's and other Cabinets. 



