38 
HALIPLID. 
Haliplus. 
fasciatus Aubé. 
(triopsis Aubé ?) 
ruficollis De G. 
longulus Lec. 
Cnemidotus. 
muticus Lee. 
1 sp. 
DyTISCID. 
Hydrocanthus. 
iricolor Say. 
Laccophilus. 
maculosus Germ. 
undatus Aubé. 
Hydrovatus. 
cuspidatus Germ. 
Bidessus. 
(pulicarius Aubé.) 
affinis Say. 
fuscatus Cr. 
granarius Aubé. 
Coelambus. 
inzequalis Fab. 
farctus Lee. 
turbidus Lec. 
nubilus Lee. 
dissimilis Harr. 
impressopunctatus Sch. 
Deronectes. 
catascopium Say. 
Hydroporus. 
undulatus Say. 
clypeblis Sharp. 
teneosus Lecar. 
PSYCHE 
tristis Payk. 
americanus Aubé. 
modestus Aubé. 
2 sp. 
Ilybius. 
biguttalus Germ. 
Coptotomus. 
interrogatus Fab. 
Ilybiosoma. 
bifarius Kirby. 
Copelatus. 
glyphicus Say. 
Matus. 
bicarinatus Say. 
Agabetes. 
acuductus Harr. 
Agabus. 
seriatus Say. 
eeruginosus Aubé. 
semipunctatus Kirby. 
punctulatus Aubé. 
reticulatus Kirby. 
erythropterus Say. 
gagates Aubé. 
Rhantus. 
binotatus Harr. 
bistriatus Bergst. 
Colymbetes. 
sculptilis Harr. 
Hydaticus. 
bimarginatus Say. 
Dytiscus. 
fasciventris Say. 
hybridus Aubé. 
Acilius. 
semisulcatus Aubé. 
fraternus Harr. 
[April 
mediatus Say. 
Graphoderes. 
liberus Say. 
GYRINIDA. 
Gyrinus. 
limbatus Say. 
ventralis Kirby. 
borealis Aubé. 
lugens Lec. 
Dineutes. 
vittatus Germ. 
assimilis Aubé. 
HyDROPHILID®. 
Helophorus. 
linearis Lee. 
inquinatus Mann. 
Hydrochus. 
ineequalis Lee. 
subcupreus Rand. 
squamifer Lec. 
Hydraena. 
pennsylvanica Kies. 
Hydrophilus. 
triangularis Say. 
‘Tropisternus 
nimbatus Say. 
glaber Lec. 
Hydrocharis. 
obtusatus Say. 
Berosus. 
aculeatus Lee. 
peregrinus Hbst. 
striatus Say. 
Laccobius. 
agilis Rand. 
