Juneigoo.] CASEY : On NORTH AMERICAN COLEOPTERA. 145 



Antennae 9-jointed in both sexes, the club oval, compact and dilated in the male, 

 with its two basal joints very short and transverse ; mesosternum between the 

 coxae rather narrow, divided longitudinally throughout by a narrow shallow sulcus ; 

 anterior coxae narrowly separated ; hypomera feebly concave anteriorly ; metacoxal 

 lamina short, gradually and very slightly longer internally ; epipleurae narrow but 

 distinct Dearthrus 



3 — Hypomera indefinitely concave as usual, without antennal fossa 4 



Hypomera with a deep concavity which is well defined internally by acute edges. ..5 



4 — Antennal club 3-jointed in both sexes, formed nearly as in Attagenus but with the 

 last joint less elongate in the males ; mesosternum between the coxae moderately 

 narrow, divided throughout by a very shallow longitudinal impression and deeply 

 emarginated behind by the tip of the metasternal process ; anterior coxae rather 

 narrowly separated ; epipleurae strongly defined ; metacoxal lamina scarcely at all 

 longer internally Perimegatoma 



Antennal club of the male 6-jointed and serriform, nearly as in Trogoderma ; 

 hypomera concave ; metacoxal plates only attaining the parapleurae ; mesosternum 

 as in Trogoderma [ Jayne] Acolpus 



5 — Antennce stout, claviform and usually serrate in the male, with the subbasal joint 

 small, generally very small and with a narrow 4-jointed club in the female ; 

 mesosternum very short and wide between the coxa; and completely divided 

 longitudinally by a deep broad sulcus ; anterior coxae rather narrowly separated ; 

 metacoxal lamina short, gradually, feebly and rectilinearly longer internally, as in 

 Dearthrus ; epipleurae rather feebly indexed and not coarsely delimited ; anterior 

 femora retractile, the crural cavities separated from the antennal fossae by a thin 

 cariniform interval Trogoderma 



Antennae with a large oval and compactly 2-jointed club, securely and closely fitting 

 in repose within deep fossae, which are separated by a flat interval from the crural 

 cavities in both sexes ; mesosternum as in Trogoderma, the anterior coxa; more 

 widely separated ; epipleurae feebly inflexed, rather well defined ; metacoxal 

 lamina short, with its hind margin transverse Cryptorhopalum 



Antennae with a male club consisting of a single very large subsecuriform joint, closely 

 fitting in repose within hypomeral fossae ; remaining characters nearly as in Cryp- 

 torhopalum; \_Axinocerus Jayne] Thaumatoglossa 



If the metacoxal plates only attain the parapleurae in Acolpus, as 

 stated by Jayne, this genus forms a remarkable exception to the entire 

 tribe, and I strongly suspect that the author is mistaken. Neither 

 this genus nor Thaumatoglossa is represented before me at present, 

 and I am therefore unable to consider them below. The species are 

 all pubescent, generally with nubilous variation in density, usually 

 elongate or oblong-oval in form and of less compact build than in the 

 Anthrenini or Orphilini, but similar in this respect to the Dermestini 

 and Trinodini. 



