232 



PROCEEDINGS OF THE ACADEMY OF 



separating the middle coxae, and leaving a cavity for the reception of the 

 last joints of the antennae. Metasternum channelled behind; hind coxae 

 separated, plates very slightly dilated behind, first' equal to the second, ex- 

 cept in H. foveatus. Ventral segments not connate. Legs moderate, 

 thighs not at all clavate, tibiae slender, tarsi not shorter than the tibiae, nar- 

 row, first and second joints elongated, fifth rather broad, claws small, not 

 toothed. 



Our species may be grouped as follows : 



A. Antennae 10-jointed ; hind angles of thorax rounded ; 



Disc of thorax slightly gibbous and compressed behind ; 



Sides sinuous near the front angles 1. e r r a n s. 



Sides regularly rounded in front 2. carina tus. 



Disc of thorax strongly gibbous ; 



Sides of thorax subparallel 3. linearis. 



B. Antennae 11-jointed; hind angles of thorax rounded; 



(thorax strongly gibbous ;) 



Sides of thorax nearly straight ,... 4. p u m i 1 u s. 



Sides of thorax constricted in front 5. g i b i co 1 1 i s. 



C. Antennae 11-jointed ; hind angles of thorax distinct 6. foveatus. 



A. Antennm lO-jointed ; (Cacotemnus Lee.) 



1. H. errans. Anobium errans Mels., Proc. Acad. Nat. Sci., ii. 309. 

 Middle States and Lake Superior. The disc of the thorax is but slightly 



gibbous behind ; the base and sides are rounded, so that the hind angles are 

 not apparent : the sides converge in front, and are impressed so as to become 

 sinuous near the anterior angles, which are distinct. 



2. H. carinatus. Anobium car. Say, Journ. Acad. Nat. Sci. Phila., ii. 

 187 ; ed. Lee , ii. 120. 



A very large specimen from Pennsylvania (-26 unc.) has the thorax rather 

 broader, with the sides more rounded and less impressed at the anterior angles 

 than in H. e r r a n s. 



3. H. linearis, valde elongatus, fuscus, sericeo-pubescens, thorace 

 latitudine baud breviore, lateribus antice fere parallelis, angulis posticis haud 

 conspicuis, anticis subrectis, disco scabro, postice alte elevato, antice obso- 

 lete canaliculato, elytris striis profunde punctatis, antennis 10-articulatis. 

 Long. -20. 



One male specimen from Hudson Bay Territory, about the Saskatchewan 

 region. The sides of the thorax are very broadly impressed near the ante- 

 rior angles, and are nearly parallel for more than two-thirds the length, and 

 are serrate as in H. errans. The disc is considerably elevated in front 

 of the base, the elevation becoming gradually broader and indistiuct in front,- 

 a feeble dorsal impressed line can be observed, which is more obvious upon 

 the elevated portion; there is also a very feeble lateral accessory tubercle. 

 The elytia are parallel, and the tip is obtusely rounded. The joints four to 

 seven of the antennae are equal and about as long as their width; the eighth 

 is as long as the five preceding united, and about twice as long as its width ; 

 the ninth and tenth are each a little longer than the eighth joint. 



B. Antennm 11 -jointed ; (Hemic<elus Lee.) 



4. H. pumilus, valde elongatus, castaneo-rufus, sericeo-pubescens, 

 thorace subtiliter punctato latitudine haud breviore, antrorsum paulo an- 

 gustato, lateribus fere rectis angulis posticis rotundatis, anticis subrectis, 

 dorso postice alte elevato, et gibboso, medio breviter canaliculato, dein cari- 

 nato, ad basin et versus latera late impresso, elytris punctis quadratis stri- 

 atim positis, iuterstitiis planis ; autennis 11-articulatis. Long. -11 -14. 



[Oct. 



