OF NATURAL HISTORY. 647 



gin ; punctures on the basal margin obsolete ; beneath piceous ; 

 tarsi yellow, brighter beneath. 



Length less than three-twentieths of an inch. 



This species was sent to me by Mr. Barabino. It is smaller 

 than the orbicularis F., which it resembles much in the punctur- 

 ing and form ; but that species has the subsutural stria extend- 

 ing from before the middle to the tip of the elytra. 



[Belongs to Cyclonolum. — Leg.] 



3. H. Fuscus nob. — Corresponding, almost unvariedly, with 

 specimens found in Pennsylvania. I obtained it in company 

 with Hydrocantlius atripejinis nob. 



SPH.ERIDIUM Fab. 



S. MELLIPES. — Black ; beneath honey-yellow. 



Inhabits Mexico. 



Body very minutely, and densely punctured, black; antennae 

 and palpi honey-yellow ; thorax with the anterior and lateral 

 margins obsoletely piceous ; an impressed puncture on the lateral 

 margin before the posterior angle ; elytra with punctured striae, 

 and minute, dense punctures on the flat interstitial spaces ; im- 

 maculate; beneath honey-yellow. 



Length less than one-fifth of an inch. 



The largest North American species which I have seen ; 

 rather larger than *S'. hl-pustidatum Fabr., but somewhat less 

 robust. [173] 



ONTHOPHAGUS Latr. 



1. 0. INCENSUS. — Clypeus with two elevated, transverse lines ; 

 thorax with an anterior double prominence. 



Inhabits Mexico. 



Body black, polished, punctured ; head with two transverse, 

 elevated lines ; posterior line between the eyes, and slightly emar- 

 ginate in its middle ; anterior line a little more elevated in the 

 middle, equidistant from the tip of the clypeus and posterior line ; 

 tip slightly contracted ; antennte ferruginous ; thorax on the mid- 

 dle of the anterior submargin with a transverse, sub-bilobate, or 

 . slightly and widely emarginate elevation ; an indented dot each 

 side ; elytra with punctured strite ; interstitial spaces plane, mi- 



1835.] 



