28 [April, 1S44. 



finely punctured ; a sutural and three double irregular series of somewhat large 

 punctures, the sutural series and the outer lateral one, confluent at tip: venter 

 and feet dull reddish-brown : pectus black : pleurae and epipleurae testaceous. 



Laccophilus, Leach. 



L. rufus. Rufo-testaceous, or testaceous-yellow; elytra dusky with spots. — 

 2 1. long, 1 wide. Pennsylvania. 



Dytiscus rufus, M. Catal. 



Body oblong-ovate, indistinctly punctured, rufo-testaceous: eyes black: an. 

 tennae, palpi, feet and epipleurse, testaceous : elytra clouded with brownish, 

 excepting the lateral margins, where the general color appears in a few patches; 

 apex acutely rounded : beneath rufo-testaceous. 



Hydropokus, Clairville. 



1. H. dichrous. Dusky, finely punctured, slightly pubescent; head and 

 thorax rufous; body beneath black. — Hardly 2 1. long, 1 1. wide, Pennsyl- 

 vania. 



Body ovate, finely and densely punctured, and slightly pubescent: head dull 

 rufous, with an oblique shallow indentation each side between the eyes, which 

 are black: thorax color of the head, with the middle of the anterior margin 

 dusky ; much and finely punctured, particularly the posterior margin and sides; 

 the latter slightly rounded: elytra dark reddish-brown, paler towards the sides; 

 finely and densely punctured, and slightly pubescent; apex acutely rounded: 

 antennae, palpi, feet, pleurae and epilpleurae, rufous : venter and pectus black, 

 distinctly punctured, the former with three or four lateral rufous spots. 



Var. — Larger ; head tinged with black ; thorax nearly the color of the elytra. 



2. H.striato-punclatus. Elytra black, with the tip and two undulated facia yel- 

 lowish-red, and with three triple series of large punctures, HI. long, \ 1. wide. 

 Pennsylvania. 



Oblong-ovate, glossy, punctured : head fulvous, finely and densely punc- 

 tured : antennae and palpi color of the head: thorax similarly colored, broad- 

 ly black in the middle; strongly punctured ; a round indentation on the mid- 

 dle of the base : elytra black, with the sides, apex and two undulated facias, 

 yellowish red ; three triple series of somewhat large punctures, obsolete before 

 the tip ; interstices almost as wide as the punctured spaces ; apex acutely 

 rounded : beneath and feet dull reddish : postpeclus with large and sparse 

 punctures, and profoundly grooved in the middle. 



3. H. luridipennis. Black; elytra dusky testaceous, if 1. long, § 1. wide. 

 Pennsylvania. 



Body subelliptic, finely punctured, black: head finely punctured, deep 

 black : thorax with the anterior and posterior margins much punctured, the 

 latter strongly depressed in its entire breadth ; glossy ; sides rounded, with the 

 edges rufous: elytra sparsely and finely punctured; sides parallel from the 

 base to near the tip, which is acutely rounded ; dull testaceous : beneath black: 

 palpi and feet dull red : pleurae and epiplcurne, testaceous. 



4. H. limbalis. Fuscous, with the thoracic and elytral margins testaceous, 

 or rufous. — 1^ 1. long, -J 1. wide. Pennsylvania. 



Ovate, finely punctured, glossy : head dull rufous: antenna: and palpi ru- 



