October, 1S44.] 99 



Brown, ochraceous pubescent, densely and minutely punctured; clypeus pro- 

 minent, rounded at apex ; antennas dull rufous; eyes black; thorax formed as 

 in the preceding, with the lateral margins testaceous ; posterior angles and sides 

 finely marginate ; scutel elongate, triangular ; elytra intensely finely punctured, 

 obsoletely striate, and with obsolete undulated rufous fascia?; beneath blackish, 

 with the ventral apex testaceous; feet brownish, with the tarsi and knees testa- 

 ceous. In size, form, color and disposition of the elytral spots, this species 

 resembles much H. marginatum, Fabr., and may be a local variety of that 

 species. 



3. H. brunneus. Fuscous ; thorax with the sides and posterior angles mar- 

 ginate ; elytra obsoletely maculate with cinereous. — 2 1. long, ^ 1. wide. Penn- 

 sylvania. 



Form of the preceding. Fuscous, yellowish pubescent, finely shagreened ; 

 antenna? dusky, with the basal joint dull testaceous ; clypeus transverse-quad- 

 rate, the apex truncate and obsoletely testaceous ; thorax like in marginatus, 

 Fabr., with the sides and posterior angles marginate ; elytra indistinctly macu- 

 late with cinereous ; beneath and feet blackish or dark brown ; tarsi and tip of 

 ▼enter dull testaceous. 



Parnidas, MacL. ) 

 Elmis, Latr. — Limnius, Illig. 

 E. vittatus. Testaceous; elytra with the lateral margins and suture brown.- 

 1 I. long. Pennsylvania. 



Elmis bivittatus ? Dej. Catal. 



Testaceous; head blackish above ; palpi piceous ; antenna? testaceous; tho- 

 rax subquadrate, convex, very minutely punctured, narrowed anteriorly, with 

 the middle of the anterior margin dusky ; glossy ; elytra striate-punctate, the 

 punctures large and profound ; lateral margins from behind the humerus to the 

 apex, and sutural margin, fuscous ; beneath and feet testaceous, occasionally 

 with a rufous tinge. 



Macrontchus, Miiller. 



M. lateralis. Black, with the thorax and elytra at sides white. — 1£ 1. long. 

 Pennsylvania. 



Black: head black, with two longitudinal impressed lines between and near 

 the eyes : palpi piceous : clypeus and labrurn glabrous, shining : antennas ? 

 thorax convex, widest in the middle, the sides rounded ; an obsolete impressed 

 line each side from the apex to the middle, a faint longitudinal raised line each 

 side near the posterior angles ; lateral edges white : elytra punctate-striate, cata- 

 phracted or invested with a hard crust ; lateral edges white : feet black, with the 

 tarsi piceous. 



Helophoridae, MacL. 

 HiDROcaus, Germar. 

 1. H. gibbosus. Brassy ; thorax with a broad dorsal groove ; elytra tritu- 

 berculate. — 2^1. long; 1^ 1. wide. Pennsylvania. 



Elophorus tuberculatus, M. C. 

 . gibbosus, " 



