300 
NORTH AMERICAN GYRINUS (cOLEOPTERa) 
si)P(‘inicns the suture and side niarsius are lironzed in luueh the 
usual luanuer, soiiietinies o])seurely, soinetiiiies distinctly so. 
A little experience, with careful attention to the tabular char- 
acters will probably enabh' the student to recognize lugens 
without great difficulty, but the genitalic character is the only 
sure test. Only one other species of our fauna — ntacuUventriti 
— has the oedeagus laterally compressed at tip. A similar 
structure exists in specimens of the European niarinus sent me 
by Reitter, but this species so far as I know does not occur in 
this country. Its presence on our lists is due to the long iier- 
sistent confusion of opdcus Sahlberg with uiarinus (Tyllenhall by 
hiuropean coleopterists, notwithstanding the fact that this 
('rror has been pointed out a number of times. For light on 
this matter see Sharp’s essay on the British species of Gyn'uus.^ 
G. f alii Notmair^ does not differ from lugeiis. 
28. Gyrinus analis Say 
Sdinowhat under iiiediuin size, form rather narrow and of medium conve.x- 
ify; u])])er surface uniformly bronzed, only slishtl}' more strongly so narrowly 
along the margins. Male quite strongly shining and with barely detectable 
alutaceous sculpture toward the elytral apex; female less shining, the alu- 
taceous sculpture visible throughout. Strial punctures not or only just per- 
ceptibly larger externally. Body beneath black bronzed, legs and anal seg- 
ment ferruginous. 
Male genitalia. — Iteddish or 3'ellowish brown, median lobe narrowing to 
about the apical two-fifths, thence sub])arallel and less than half as wide as 
the lateral lobes, the up])er surface obtuselj" ridged, the tip narrowh' rounded. 
Length, 4. .5 to r)..a mm.; width, 2. .a to 3 mm. 
I'ype locality. — Not stated, l)ut iiroliafily Pennsylvania. 
( )iie of our most widely dispersed species, occurring from Nova. 
Scotia to Kansas and south to (leorgia and Louisiana.. The 
following localities are rc'prc'sented in my serii's. Nova Scotia. 
(Kempf Shore): Oidario: N('w York (Itluu'a): Pennsylvaina 
(Philadelphia and t'icinity): North (’arolina (Southern Piiu's) : 
t h'oi’gia (Billy’s Island, ( ikefenoket' Swamp — Bradley): Ala- 
))ama (Mobih*; Whistlei') : hdorida (‘‘S. R.” — J. (’orse): Lou- 
isiana (\Vinnfi('ld) : Arkansas (Silver Siirings) : Indiana LMil- 
l(*i's) : Illinois ((’hicago); Michigan (Berrien ('ounty; A\dilntit 
bak(‘ — Andrews): \\’isconsin (Beaver Dam): Iowa (Iowa 
Lity; Muscat iiK* — W'ickham) : Kansas (Reno (’outdy; Douglas 
( ’ounty). 
' bnlom. .Monthly Mag., (2), xxv, ])]). 12S-i;>S, pts. ix-x, .Tune 11)11. 
’’ Ifiill. Mrooklvn lOnf. Sue., xiv, j). bjl, ilDID). 
