Oct.Dec., 1919 Bulletin of Brooklyn Entomological Society 1383 
of the fourth, seventh and ninth elevated throughout with a distinct sinua- 
tion opposite the break in the fifth. Tarsi four jointed on all the legs, 
the last joint as long as the other three combined; claws long, strongly 
arcuate and denticulate at base; under surface finely granulate and opaque. 
Length 3.25 mm.; width 1 mm. . One specimen. 
This species differs from those hitherto described by its very 
broad thorax. 
Hydraena pennsylvanica Kies. (8). 
Tropisternus mixtus Lec. (2). 
Tropisternus glaber Hrbst. (34). 
Hydrocharis obtusatus Say (5). 
Berosus aculeatus Lec. (1). 
Berosus striatus Say (63). 
Laccobius agilis Rand. (2). 
Philhydrus nebulosus Say (1). 
Philhydrus ochraceus Mels. (4). 
Philhydrus hamiltoni Horn. (2). 
Cymbiodyta fimbriata Mels. (3). 
Cymbiodyta minima n. sp. 
Form oblong-oval, slightly elongate, moderately convex. Color dark 
piceous, shining, border, including the narrow. basal and apical margins of 
the thorax indefinitely pale. Head slightly transverse, one half as wide 
as the thorax. Thorax twice as wide as long, as wide as the elytra; 
strongly narrowed in front, sides feebly arcuate, all angles rounded, apex 
slightly emarginate. Elytra one half longer than wide; sides nearly 
straight and parallel to the middle, thence evenly arcuate to the rather 
blunt apex. Thorax and elytra similarly rather closely punctured, but the 
elytral puncturation slightiy coarser ; punctures throughout distinct. Trans- 
verse rows of coarser punctures on the thorax rather indistinct; rows of 
coarser punctures on the elytra not disinguishable; sutural striz evanes- 
cent at basal one third; others absent. Beneath dark piceous; coxe and 
tarsi rufo-piceous; finely and closely punctate and pubescent throughout 
excepting the posterior coxal plates and the narrow posterior edge of the 
metasternum which is impunctate and glabrous. Prosternum simple; 
metasternal ridge strongly and acutely elevated at middle, having the 
appearance of a strong tooth between the middle coxz when viewed hori- 
zontally. Tarsal joints 5-4-4. 
Length 2.75-3.5 mm.; width 1.35-1.75 mm. Three specimens. 
This species is much smaller and slightly narrower and more 
parallel in form than C. lacustris. In the latter the mesosternal 
ridge is much less strongly elevated and is broadly arcuate, not 
at all dentiform. 
