102 [October, 1844. 



colored than that species. It also resembles apicale, Say, but aside of the dif- 

 ferent disposition of the colors, it has the exterior elytral striae entire. 



2. C. nanum. Deep glossy black ; thorax piceous at the anterior margin; 

 elytra punctate-striate. — 1 1. long. Pennsylvania. 



Ovate, convex, deep black : head and thorax highly polished, densely and 

 very finely punctured, the latter with the anterior and lateral margins slightly 

 piceous : palpi testaceous : antennas and feet piceous : scutel small, elongate, 

 triangular : elytra distinctly striate, with the interstices very minutely wrinkled : 

 beneath piceous. 



3. C. mundum. Black; elytra, feet, palpi and antennae testaceous; each 

 elytrum with a black spot in the middle. — ^ 1. long. Pennsylvania. 



Ovate, moderately convex : head and thorax black, highly polished, hardly 

 punctured, the latter with a rufous tinge, particularly on the lateral margins : 

 scutel colored like the elytra, the latter distinctly punctate-striate, rufo-testa- 

 ceous, each with a large, somewhat obsolete, blackish spot towards the tip ; an- 

 tennae, palpi, and feet testaceous : beneath blackish. 



4. C. minusculum. Blackish; elytra punctate-striate. — g 1. long. Penn 

 sylvania. 



Ovate, very convex, blackish, glossy : head shining, densely and finely punc- 

 tured : thorax shining, less strongly and densely punctured than the head ; 

 lateral and anterior margins piceous: scutel minute : elytra distinctly punctate- 

 striate, the interstices very obsoletely rugose ; black, with a rufous tinge, parti- 

 cularly the sutural region : feet testaceous? Resembles nanum, but is much 

 smaller. 



Agathidiidse, Westw. 



Phalvcrus, Payk. " 



1. P.politus. Deep black, shining, impunctured. — 1 I. long, £ 1. wide. 

 Pennsylvania. 



Hydrophilus politus, Melsh. Catal. 



Short, oval, deep black, slightly piceous, shining, impunctured : clypeus ob- 

 tusely rounded at tip : mandibles slender, with the apex acute and black : an- 

 tennae piceous, with the clava fuscous, compact, fusiform : palpi piceous : thorax 

 convex : scutel large, obtuse-triangular : elytra convex, short, obtusely rounded 

 at apex ; highly polished, the sutural stria distinct from behind the middle to 

 the apex : beneath blackish : feet piceous, short, the femora robust, somewhat 

 compressed ; tibice compressed, finely spinose at the edges; tarsi short, slender, 

 the articulations obsolete. 



2. P. apicialis. Castaneous, shining ; apex of the elytra, feet and beneath, 

 testaceous. — 1 1. long. Pennsylvania. 



Oblong-oval, impunctured, reddish-brown, very shining : eyes black : antenna; 

 and palpi testaceous : thorax with the sides paler than the disk : elytra with 

 the apical third testaceous ; sutural stria abbreviated a little behind the base : 

 feet and beneath testaceous. 



3. P. nitidus. Castaneous, nitid, impunctured. — ^ 1. long. Pennsylvania. 

 Short, ovate, greatly convex, light chestnut, highly polished, impunctured: 



