182 long's second expedition. 



half; on this half the punctures are larger and the striae more 

 deeply impressed than on the exterior half where the surface 

 has a minutely granulated appearance ; tip acute ; feet blackish- 

 piceous ; tarsi piceous ; anterior tibia with a line of dense yellow- 

 ish hairs before. 



Length one-fourth of an inch. 



[Belongs to HcUclms Er. — Lec] 



HYDROPHILUS Fabr. 



1. H. ciNCTUS. — Black, surrounded with a yellowish margin. 

 Inhabits United States. 



H. cinctus Knoch, in Melsh. Catal. 



Body black, polished, with numerous, minute, regular punc- 

 tures ; head with a large, triangular, yellowish spot before the 

 eye ; palpi yellowish ; antennae fuscous ; thorax margined with 

 yellowish ; this color is sometimes obsolete on the anterior mar- 

 gin, and generally obsolete on the posterior margin ; elytra with- 

 out any appearance of striae; the exterior margin, from the hu- 

 merus to the suture, yellowish ; beneath blackish-piceous ; tarsi 

 dull yellowish. 



Length more than one-fifth of an inch. 



We obtained specimens on Red River of Lake Winnepeek ; it 

 is also found in Pennsylvania. 



[Belongs to PMlhydrus Sol. — Leg.] 



2. H. GLOBOSUS. — Very convex, oval; elytra with striae of 

 punctures. 



Inhabits United States. 



H. glohosus Knoch in Melsh. Catal. 



Body very convex, black, immaculate, punctured ; head with 

 very regular minute punctures, and three or four somewhat 

 larger ones before the eye; palpi yellowish ; [277] antennae yellow- 

 ish, clava fuscous ; thorax with minute punctures but slightly im- 

 pressed ; angles rounded ; scutel with obsolete punctures ; elytra 

 with minute, numerous punctures, which are very slightly im- 

 pressed, obsolete ; with nine regular striae of distinct larger 

 punctures, and an irregular series on each interstitial space ; be- 

 neath piceous-black ; tarsi color of the palpi. 



Length three-tenths of an inch. 



I 



