288 
NOIITH AMERICAN GYRINUS (cOLEOPTERA) 
Mule (jenilalia . — Of a rather dark brownish ferruginous tint, the middle 
lobe very narrowly linear in apical third, not more than about one-sixth as 
wide as the lateral lobes. 
Length, 4..'> to 6.1 mm.; width, 2.5 to 3.5 mm. 
Type locality . — San Diego, C'alifornia. 
Known to me also from Pomona, Pasadena, Palm Siirings, 
Kernville and the vicinity of San Francisco (Alameda, iNIarin 
and Sonoma Counties) in California: Corvallis, Oregon: Hua- 
chuea Mountains, Arizona: Canon City, Colorado: Davis 
^Mountains, western Texas. 
This is one of the few siiceies in our fauna ]iossessing a positive 
uniipie superficial character in the small iilica at the outer 
apical angle of the elytra, which when once apiireciated offers 
a certain means of identification. It is distinctly more robust 
than any other species occurring in the region which it occupies. 
b). Gyrinus pachysomus new species 
Broadly oval, very convex, surface highly polished and without trace of 
alutaceous sculpture in either sex; sides broadly bronzed; punctures of striae 
near the suture very much finer than at sides; eleventh stria rather close to 
the margin. Body beneath nearly uniformly reddish brown. 
Mule gcuiluliu . — Rufous or rufo-testaceous, middle lobe parallel-sided and 
f('('bly convex apically, about half as wide as the lateral lobes, the apex eveidy 
I'ounded. 
Length, 5.5 to 6.2 mm.; width, 3.15 to 3.6 mm. 
Type locality . — Southern Pines, North C'aroliiui. Type in 
th(^ author’s collection. 
ddic type is a male sent me by Rev. A. H. iNIanee and bears 
date ¥-5-11)15. There are also before me siiecimcns from 
l''redericksburg, Virginia (Richardson), and Mobile, Alabama 
( boding). 
Th(' ratlu'i- lai'gi' size and robust conv('x form ma.k(' this oiu' 
of our most easily la'cognizabli' sp('ci('s. LJlcvatas is about 
(‘(imtlly thick bodiial and of th(' sanu; color iKUieath, but is a 
much smalh'r siiecies. 
I t. Gyrinus elevatus LeCoute 
Rather small, strongly convex, the point of maximum elevation of tlu' 
longitudinal jjrofile being slightly in advance of (he middle of the length. 
Al)ove black with sides conspicuously bronzed, surface highly i)olish(‘d and 
without trace of minute punct illation or alutaceous sculpture in either sex. 
Strial imnctures much finer near the suture than near the margins; eleventh 
