( aa ) 
it is now mutilated, yet I have no hesitation in giving it as 
distinct from any other I am acquainted with. 
HALIPLUS, Latr. 
H. Say. Some specimens were found in 
Mexico, in the locality above mentioned by Wm. Bennett 
and presented to me by Mr. Wm. Maclure. They vary a 
little from those of this region in being very slightly more 
elongated and larger ; but the spots, their arrangement and 
the sculpture appear to be precisely the same. The spe- 
cies is therefore found over the greater part of North Amer- 
ica East of the Rocky Mountains; 
NOTERUS, Latr; 
N. hicolor^ Honey-yellow ; elytra black, punctured. 
Inhab. Louisiana. 
Head and thorax honey yellow : eyes black 1 palpi not 
deeply emarginate: elytra black, punctured; at tip obso- 
letely piceous, very obliquely and slightly truncate ; acute : 
beneath honey yellow, or piceous. 
Length one-tenth of an inch. 
For this species 1 am indebted to Mr. Barabino; 
HYDROCANTHUS, Say. 
H. atripe finis, Ferruginous; elytra black. 
Inhab. Alexico. 
Head and thorax ferruginous ; the former witli an oblong 
triangular, obsolete, darker spot between the eyes^ and the 
latter with an impressed line on the lateral submargin : ely- 
tra blue-black, immaculate, imputictured : pectus, well as 
the head beneath, dull yellowish ; sternum flat, at its ante- 
rior tip acute, but not prominent, dusky: postpectus black- 
ish, dull yellow at tip : feet, intermediate and posterior pairs 
blackish, slightly varied with piceous. 
Length less than one-fifth of an inch. 
This is the second species of this genus ; the first I pub- 
lished in the Trans. Philos. Soc. of Philadelphia, New Se- 
ries, Vol. 2 ; The genus is allied to Noterus, Latr. but 
the labial palpi are much more dilated and have no appear- 
ance of emargination. 
GYRINUS, ImnL 
I. G. emarginatus. Say. Trans. Amer. Philos. Soc^ 
