HALIPLIDyE. 67 



(95) 2. Hydroporus parallelus. (Say.) Parallel Hydroporus. 



Hydroporus parallelus. Say. Journ. Acad. Phil. Ill, i, 153, 1. 

 Length of the body 2^ lines. 



One specimen only taken. Mr. Say took it in the Upper Missouri. 



DESCRIPTION. 



Body most thickly and minutely punctured, underneath mostly black. Head black with a pair of 

 vertical dots, a line between the eyes, a triangular spot on the nose and the mouth, reddish-yellow ; 

 antenna? dusky at the tip : prothorax reddish-yellow with a large discoidal irregular black spot, which 

 does not reach the anterior margin, and is divided longitudinally by an articulated reddish-yellow 

 stripe ; there is likewise a black dot on each side, and the posterior margin is black : the elytra are 

 black with seven very narrow lurid-yellow stripes, which are confluent at the base and apex by pairs; 

 the third from the suture is twice interrupted ; a series of punctures adjoins the fourth stripe on the 

 side next the suture : the epipleura and lower margin of the prothorax are lurid-yellow : the legs 

 are testaceous with the four anterior tarsi black. 



(96) 3. * Hydroporus uevis. Smooth Hydroporus. 



H. flezvis) lavissimus, subtus niger, supra luridus ; prothorace postice transverse impresso : maculis duabus, elytrisque lineis 



sex, maculisque tribus lateralibus, nigris. 

 Smooth Hydroporus, very smooth, black underneath, above lurid ; prothorax transversely impressed behind : with two 



spots, elytra with six lines and three lateral spots, all black. 



Length of the body 2 lines. 



One specimen only taken. 



DESCRIPTION. 



Very like the preceding species but smaller; it differs principally in being perfectly smooth and 

 without punctures, even when examined under a powerful magnifier. The head has two larger 

 vertical lurid-yellow spots, and there is a triangle of the same colour between the eyes, which at its 

 base is dilated and occupies the nose and mouth : the prothorax is lurid-yellow, with two oblong 

 oblique dusky spots beyond the middle ; towards the base is an obtusangular transverse impression, 

 and on each side, at a little distance from the margin, is an oblong punctiform impression ; in the 

 elytra are six distinct narrow black stripes, none of which are confluent except at the apex; at the 

 side, but at some distance from the lateral margin, are three black spots placed in a line, or a stripe 

 wider than the others twice interrupted : the legs are testaceous with the posterior tibiae black at 

 the tip. 



K 2 



