132 Bulletin of the Brooklyn Entomological Society Vol. XIV 
feebly bronzed on the basal third, moderately shining and distinctly aluta- 
ceous with magnification; beneath black, legs rufous. Elytral apices rather 
oblique and strongly rounded, outer angles not distinct; striz not distin- 
guishable; punctures fine and rather widely spaced, outer ones scarcely 
larger; punctures of apical oval small, but strong and distinct. 
Length 6 mm.; width 3 mm. 1 9. 
This species resembles G. maculiventris very closely in form. 
It is more gradually and evenly narrowed in front. The elytral 
punctures are slightly finer and more widely spaced. It is more 
elongate in form than G. lugens and differs from G. analis by the 
entirely black abdomen and strongly rounded elytral apices. 
Dineutes discolor Aubé (50). 
HYDROPHILIDA. 
Helophorus lineatus Say (1). 
Helophorus inquinatus Mann. (3). 
Hydrochus squamifer Lec. (38). 
Hydrochus excavatus Lec. (24). 
Hydrochus laticollis n. sp. 
Form elongate, subcylindrical, very slightly wider behind the middle. 
Color pale cupreo-iridescent; head brilliant blue-green metallic; beneath 
dull blackish piceous, antenne, palpi and legs brownish testaceous, femora 
and apex of the claw joints darker. Head one third broader than long, 
just perceptibly narrower than the thorax; eyes very large, hemispherical ; 
front oblique on the sides and feebly rounded at the apex which is broad; 
head coarsely granulate with a narrow longitudinal groove between the 
eyes connecting with the broadly V-shaped clypeal suture. Thorax nearly 
twice as wide as long, three fifths as wide as the elytra, very slightly wider 
at apex than at base, widest slightly before the middle; sides slightly more 
convergent posteriorly than anteriorly, very faintly and broadly sinuate 
before the obtuse posterior angles; apex truncate, anterior angles slightly 
obtuse and rounded in but strongly marked, surface coarsely granulate, 
sides feebly crenulate; disk with two large shallow foveze on basal half, 
the usual anterior median fovea greatly reduced in size and distinctness; 
an elongate fovea on the, lateral declivities. Elytra three and one half 
times as long as the thorax, two and one third times as long as wide, much 
wider than the thorax at base; humeri broadly rounded, sides very slightly 
wider and just visibly sinuate to apical third, thence feebly arcuate and 
convergent to the bluntly rounded apex; elytra with ten rows of coarse, 
deep, subquadrate punctures; intervals unequally subcarinate; the third 
more strongly elevated at base, fourth elevated for a short distance near 
the middle, fifth elevated throughout with a break opposite the elevation 
