n. C. FALL 
28 :i 
Male (jenitalia. Entirely riifo-testaceous in color, the middle lobe ])arallcl 
in about its apical third, feebly convex dorsally, aboui half as wide as the 
lateral lobes, the apex circularly rounded. 
Length, 4.1.0 to f) !nin.; width, 2. bo to 2.75 mm. 
Type locality . — Staten Island, New York. Tyi)C in llu* au- 
thor’s collection. 
The tj-pe (cf) is one of a series sent me by Mr. Lewis IL 
Woodruff, who took them from Willow Brook, June 14, B)B). 
With them I place two males from Philadelphia Xet'k, Penn- 
sylvania, and a single male from Florida, which have identical 
male genitalia and are douldless conspeeifie. In the type .s('ri(\s 
all specimens are very symmetrically convex in profile, tlu' 
highest i)oint of the arch being at the middle of the length. 
This is also true of the single Florida specimen, but in the Phila- 
delphia ones the profile is slightly gibbous, the highest point of 
the arch being a little in advance of the middle. In the femah's 
the surface luster is slightly dimmed by a very fine ahdaceous 
sculpture as in latUinihus, and the outei' elyti'al stria(‘ ai'c* just. 
visil)ly impressed. I have not noticed this latter charactc'r iu 
any of the males, nor in either sex of latilimhm. 
7. Gyrinus marginellus new .species 
Form rather narrow and strongly convex; black, sides not at all bronzed 
in the few specimens known; surface highly polished, not visibly alutaccous or 
micro-punctidate in either sex; side margins of thorax and elytra very nai row; 
strial i)uncture& moderate, slightly stronger in the lateral rows; eleventh stria 
distant from the margin; body beneath nearly unitormly rufo-ferruginous. 
Male genitalia. Rufo-testaceous, middle lobe broad, distinctly wider than 
the lateral lobes, just visibly widened apically, tip broadly rounded, upper 
surface carinate, the carina becoming obsolete at tip, which is flattened. 
Length, 3.9 to 4.4 mm., width, 2 to 2.3.5 mm. 
Type locality. — Lakehurst, New Jerst'y (cf). Fyp<‘ hi Ihe 
author’s collection. 
Descrilx'd from three examples, out' ptiii’ (cf, 9) colleclml 
tind kindly given me by Mr. W. T. Davis; a st'coud m;d(‘ Ixairs 
label “Atco X. J. Kemp.” 
As indicated in the description the thi'ce ex:im])les of th(' lypt' 
series are highh' itolishetl, Itlack, without trtice ot tieiu'ous 
luster either at suture or margins. It is, howevc'r, very doubt- 
ful if this will prove constant in a longi'r scales. Marytncllu-'i 
is superficially more or less closely similar fo foui’ other sjx'cie.s 
TRAXS. .\M. EXT. SOC., XLVII. 
I 
