128 ACADEMY OF NATURAL SCIENCES 



Var. a. Dusky ; the bands occupy nearly the whole surface of 

 the elytra, leaving only a few obsolete whitish spots. 

 Length rather more than one-fifth of an inch. 



o 



Very common on the Missouri. Near Engineer Cantonment I 

 observed a great number of this species in October, flying in the 

 evening, near a sand bar. I obtained a different species, a few 

 years since, on Senij)uxten, eastern shore of Maryland. [200] 

 2. H. pusiLLUS. — Dark reddish-brown impunctured, hairy, 

 hairs short, rather rigid, reflected, whitish : eyes pale reddish- 

 brown : beneath blackish ; carina of the pectus piceous : thighs 

 reddish-brown. 



Length less than one-tenth of an inch. 



This species was obtained on the shores of the Missouri river 

 below the entrance of the Platte. 



[H]ELOPriOIlUS. 



E. LINEATUS. — Greenish ; thorax with five longitudinal im- 

 pressed lines; elytra grayish. 



Elophorus gr incus? Herbst in Melsh. Catal. 



Head rugose with appi'oximate elevated punctures, and tinged 

 with bright green : eyes black : antennae pale testaceous ; clava 

 diisky pubescent : palpi pale testaceous, dusky at tip : mandibles 

 varied with purple and green above : thorax greenish, sometimes 

 varied with cupreous ; rugose, with approximate elevated punc- 

 tures ; transverse-quadrate ; anterior angles advanced, posterior 

 ones acute ; lateral edge excurved near the base ; disk with five, 

 equidistant, longitudinal, strongly impressed lines; scutel minute 

 suborbicular, cupreous : elytra yellowish-gray or whitish-testa- 

 ceous ; striate, striae with dilated, transverse punctures ; pectus 

 reddish yellow : postpectus and venter dusky : feet pale testa- 

 ceous. 



Length less than three-twentieths of an inch. 



Found in the river near Engineer Cantonment. 



The name of gri&eus has been applied to another species. It 

 is a native also of the Atlantic States. [201] 



HYDROPHILUS Fab. 

 1. H. TRIANGULARIS. — Olivaccous-black ; postpectus and sides 

 of the venter with dull yellowish hair. 

 Inhabits the United States. 



[Vol. III. 



