SILPIIIDAB. 79 



Antennae 10-joiutwl, capitate, the last four joints forming an abrui)t club. 

 Middle coXcB widely separated ; anterior coxtu widely open Ijeliiiid without 

 post-coxal extension of the prothoracic epimera. Necrophorus. 



Antennse 11-jointed, either slender or gradually clavate. Middli; coxa; 

 moderately sei^arated ; anterior coxae widely open behind withdut post- 

 coxal process of prothoracic epimera. Silpha. 

 Middle coxje narrowly separated or contiguous. Anterior coxa? narrowly 

 open, partially closed by a prolongation of flu' prothoracic epimera. 

 Epi])l(Miral fold wide, the elytra margined at the sidcis. Last joint of 

 maxillary palpi slender. 

 Antennae gradually clavate, not longer than the head and thorax. 

 Antennae free at base, not inserted under a frontal margin, first 

 and tliird joints long. Necropliilus. 

 Antennae arising under a frontal margin, first joint .shui-t, robust, 

 third scarcely longer than the second. Pelates. 

 Antennae slender, scarcely thicker externally, as long as half tlic; 

 body. 

 Elytra entire ; penultimate tarsal joint simple. Pteroloma. 

 Epipleural fold narrow, the elytra with an exti-emely narrow margin. 

 Last joint of maxillary palpi ovate. Agyrtes. 

 Antennae 11-jointed, capitate, the last three forming an abrui)t club. 

 Anterior coxal cavities narrowly oj)en behind, partially closed by a 

 slender prolongation of the epimera. 

 Aljdomen witli five segments. Elytra truncate. Spliaerites. 



The first three genera are represented on both sides of the 

 continent, Pelates and Pteroloma occur in California and Alaska. 

 Agyrtes contains one species found on both coasts. Spha?rites 

 witli one species, having an appearance ver}' similar to Ulster, is 

 comn)on to northern Europe, Alaska, and Vancouver. 



Tribe II.— LVROSOIWIIVI. 



Anterior coxoe conical, prominent, contiguous, with a large 

 trochantin, the cavities strongly angnlate externally and open 

 behind. Middle coxto narrowly separated, posterior coxic sepa- 

 rated by an intercoxal jorocess of the abdomen. Abdomen with 

 live segments. Antennaj inserted under a frontal margin, eyes 

 not prominent. 



This tribe is distinguished from the Silphini by the separation 

 of the posterior coxa) and from -all, except S])h!rri/<'x, by the 

 abdomen with five segments. It seems to occupy an intermediate 

 position between the Silphini and the elongate Cholevini, and is 

 represented in our fauna by Lyrosovxa opacuin Mann., occurring 

 in Alaska. 



