Oct—Dec., 1919 Bulletin of Brooklyn Entomological Society 131 
HALIPLID/A. 
Haliplus borealis Lec. (3). 
DYTISCIDA. 
Laccophilus maculosus Germ. (39). 
Desmopachria convexa Aubé (1). 
Bidessus affinis Say (34). 
Celambus inaequalis Fabr. (17). 
Celambus turbidus Lec. (1). 
Celambus laccophilinus Lec. (2). 
Hydroporus vitiosus Lec. (3). 
Hydroporus consimilis Lec. (1). 
Hydroporus tenebrosus Lec. (1). 
Hydroporus modestus Aubé (7). 
Hydroporus morio Sharp. (1). 
Tlybius biguttulus Germ. (7). 
Agabus reticulatus Kby. (1). 
GYRINIDZ. 
Gyrinus confinis Lec. (1). 
Gyrinus limbatus Say (7). 
Gyrinus dichrous Lec. (2). 
Gyrinus fraterculus n. sp. 
Form oval, slightly elongate, rather convex. Color black, broadly bronzed 
on the sides, punctures and sutural margin not bronzed; shining, just 
visibly alutaceous with strong magnification; beneath rufous including the 
elytral epipleurze, abdominal segments darker. Thorax not strongly nar- 
rowed in front. Apices of the elytra rather broad and broadly rounded, 
nearly squarely truncate, outer angle distinct, but narrowly rounded; 
elytral striz not distinguishable; punctures rather coarse and approximate ; 
outer punctures distinctly coarser. 
Length 4.35 mm.; width 2.15 mm. 1 d. 
This species may be distinguished from G. limbatus and G. dichrous 
which it closely resembles by its slightly less strongly narrowed thorax, 
broader and more squarely truncate and less strongly rounded elytral 
apices, coarser and more approximate elytral punctures. 
Gyrinus maculiventris Lec. (12). 
Gyrinus falli n. sp. 
Form elongate-oval, evenly narrowed anteriorly and posteriorly, some- 
what convex. Color black, suture bronzed, sides rather narrowly and 
