LONGS SECOND EXPEDITION. Is;; 



This species is oval, not elongated, and is more convex than 

 any other species of this country yet discovered. 

 [This is a species of Hydrobius Leach. — Lec] 



3. H. nebulosus. — Pale whitish-testaceous; a subsutural line 



the elytra obsolete before the middle. 

 Inhabits United States. 



If. nebulosus Melsh. ) ,, , , ,, 

 rr , 7 . T , , > Melsh. Catal. 

 Ji. labxatus Knoch. i 



Body very finely but irregularly punctured ; punctures some- 

 times obsolete; head black or varied with black ; thorax, angles 

 rounded; elytra with a subsutural impressed line which disap- 

 pears before the middle, and is more deeply impressed behind : 

 beneath, excepting the feet, blackish. 



Length less than three-twentieths of an inch. 



I obtained a specimen in the Lake of the Woods. 



[Belongs to PMlhydrus. — Lec] 



APHODIUS Illig. Fabr. 



1. A. hamatus. — Thorax impunctured on the disk; claw of 

 the anterior tibia dilated, incurved. 



Inhabits North-west Territory. 



Body dark piceous ; clypeus minutely punctured ; margin re- 

 flected, particularly at tip ; tip truncated, subemarginate ; thorax 

 punctured each side and at base ; large, equalling at least two- 

 thirds the length of the elytra; elytra [278] palerthan the head and 

 thorax; striate; striae punctured; feet rufous; the claw at the tip 

 of the anterior tibia is dilated and curved inwards like a hook. 



Length less than one-fourth of an inch. 



An insect remarkable for its short robust stature and the pro- 

 portional length of its thorax, as well as for the dilatation and 

 and crooked form of the appendages at the extremity of the tibia. 



2. A. clypeatus. Black ; elytra testaceous; clypeus, covered 

 with small tubercles. 



Inhabits North-West Territory. 



Head black, convex, covered with very small obtuse tuber- 

 cles; edge a little elevated, piceous; tip hardly truncated ; tho- 

 rax with irregular small obtuse ruga' ; anterior angles rectangular: 

 posterior edge regularly arcuated, not dilated in the middle; 

 elytra rufo-testaceous, dusky at base; with deep, punctured striae; 



