1873.] LOO [Horn. 



ishes so that in the form above cited as regular is, the crest is reduced to a 

 mere tuberosity. The specimens from Oregon and Vancouver are usually 

 slightly bronzed. 



Its distribution extends from England eastward through Europe to 

 Siberia, thence to Alaska and southward to California, and thence east- 

 ward to Pennsylvania. « 



The species referred to the sub-genus Paraeymus are all small, usually 

 very convex and semi-globose, and may be known as follows : 



Body oblong, depressed ; mesosternum simple dissimilis. 



Body broadly oval very convex. 

 Mesosternum simple. 



Oblong oval, elytra nearly smooth suturalis. 



Broadly oval, elytra punctured rufiventris. 



Mesosternum protuberant. 

 Presternum simple. 



Color piceo-testaceous, indistinctly punctured. . inj 'meatus. 



Black with aeneous tinge, punctured digestus. 



Presternum carinate. 



Surface smooth sparsely punctured subcupreus. 



Surface finely alutaceous, indistinctly punc- 

 tured despectus. 



H. rufiventris, n. sp. 



Oval, very convex, piceous black, margins piceous, shining. Head and 

 thorax finely and sparsely punctulate, elytra more coarsely punctured 

 especially at the sides and apex. Body beneath and legs rufous. Meso- 

 sternum and presternum simple. Length .09 inch ; 2.25 mm. 



Resembles II. digestus, but is more convex and much less distinctly 

 punctured. Its simple mesosternum will at once distinguish it from all 

 the very convex species in the sub-genus. There is almost no aeneous 

 lustre. 



One specimen from Southern Oregon. 



H. infuscatus, Motsch. (Br achy palpus), Bull. Mosc. 1859, III, p. 177. 



Similar in form and sculpture to the preceding. Color piceo-testaceous 

 margins somewhat paler, head black, disc of thorax irregularly clouded 

 with piceous. Body beneath piceous, legs rufo-piceous. Mesosternum 

 with transverse carina, presternum simple. Length .09 inch ; 2.25 mm. 



Occurs from California to the Indian Territory. 



H. digestus, Lee. Proc. Acad. 1855, p. 373. 



Rather less convex than any of the allied species and more coarsely 

 punctured. Surface with very distinct aeneous tinge. Mesosternum 

 feebly prominent, presternum simple. Body beneath black, legs piceous. 

 Length .09 inch ; 2.25 mm. 



Middle States and Canada. 



H. subcupreus, Say (Hydrophilus), Journ. Acad. V, p. 189 ; Lee. Proc. 

 Acad. 1855, p. 373. 



