282 
NORTH AMERICAN GYRINUS (cOLEOPTERA) 
As thus identified fraternus is known to me from Paris and 
Monmouth, iMaine (Frost); Hooksett, New Hampshire; Attle- 
boro, Arassachusetts, and Riverhead, Long Island, New York 
(W. T. Davis). 
f). Gyrinus aeneolus LcCoiite 
Rather narrowly oval, not very convex, typically with the entire upper 
surface distinctly bronzed, often, how'e\er, with the disk feebly bronzed, be- 
coming more evidently so tow'ard the margins; surface polished and without 
trace of alutaceous sculiiture in either sex; lateral rows of ininctures slightly 
larger than the sutural, eleventh stria distant from the margin. Beneath 
nearly uniformly rufo-testaceous. 
^/^le oenitaU.n. Pale rufous or flavo-testaceous, median lobe parallel sided 
in about apical fifth, ami about one-third as wide as the lateral lobes. 
Lriifilh, 4.1 to 5.1 mm.; width, 2.15 to 2.7 mm. 
Both file upper and lower extremes are represented in a small series from 
■Montreal, C'anada. The majority of specimens are near the 4.5 mm. mark. 
Type locality. — “ Illinois.” 
'riu'rc ar(' in the scries before me four examples from “('. 
111.,” kindly donated by Prof. Malloeh of the Illinois State 
University, which must be from somewhere near the type lo- 
cality. A single female specimen from Duliois County, Indi- 
ana (Platchley), I have compared with the LeConte tyjie and 
find it to be practically identical. 
Other localities represented ai'e “Penn”; New York (Ithaca, 
Fsopus, Pine Island and Windsor); iMaine (Paris); Canada 
(Montreal). 
This species may be rather easily confused with ivoodrujfi, ]mt 
the less convex foi'in and more distinct aeneous luster may 
s(‘i'V(' to separate it. It should be said, however, that the 
(‘asti'i'ii exami)les of aeneolus seem to 1)C less evident 1}^ bronzc'd 
than tlu' wi'stei'ii oiu's. The gimitalia are of the same typi', 
but th(‘ middh' lobe is p('rc(‘))tibly nari'ower in aeneolus. 
(i. Gyrinus woodrufli iicw' species 
Of the saiiK' size and clo.sely similar in general appearance to the prece<ling 
species, but (‘vidently more convex as vieweil in ])rofile and with the ui)per 
surface' h'.ss distinctly to scarc.cly aeneous, 'the resemblance to Intiliinbus is 
:dso strong, but from this iroodrvjfi may l)e distinguished by tlie anterior sub- 
marginal liiK' of punctures at tiu' sides of the pronotum being elo.ser to the 
m.'irgin, by the more narrowly reflexed side margins of the thorax and elytra, 
and by the ('leve'iith elytral stria being veiy plainly more remote from the 
margin. 4’he sides of the elytra are rather broadly bronzed but less wideb' 
so than in Intiliinhini, and much le.ss conspicuously so as a rule. 
