H. C. fall 
303 
The rather dull luster and surface sculpture of this species is 
more remindful of opacns than of any other, but the rather 
broader and slightly Hatter form, together Avith the dark chiAvs 
should distinguish it Avithout much difficulty. In range, ^ral- 
Jisi is thus far one of our most restricted species, luiA’ing been 
taken only along the line of the Hudson Bay Raihvay, in tlu* 
Hat marshy lake region between Lake Winnipeg and Hudson 
Bay. Hoav far to the east or Avest it may yet l)e found is i)rob- 
lematical, but it has not yet l)een taken by Carr at Edmonton, 
nor did Notman find it at C’ochrane, North Ontario. 
Since the aboA^e Avas Avritten I haA'e seen an example in the 
C'ornell UniA'ersity collection lal)elled “Ontario Can.” 
3 1 . Gyrinus frosti iieAv .species 
Broadly OA’al, moderately coiiA'ex, distinctlA’ gihhou.s in profile, the highest 
l)oint of the arch being well up toward the base of the elytra; black, sides 
rather narrowly and feebly bronzed, surface luster only moderate, being 
dulled in both sexes by the A'ery fine alutaceous ground sculpture; strial punc- 
tures rather fine, only slightly larger in the lateral rows. Beneath metallic 
black, anal segment often more or less rufous or rufo-piceous; legs rufous, the 
middle and hind thighs sometimes a little dusky at base. 
Male f/enitalia . — Dull rufous, the middle lobe more or less dusky apicall\’; 
midtile lol)e broad, arcuately expanded and superiorly' concaA’e (sjtatuliform ) 
a])ically, Avhere its width is subetjual to fhal of tiu' lateral lobes; tip cither 
broadly rounded or subangulate. 
Letu/lh, 4.8 to (>.3 mm.; Avidth, 2.7 to 3.() mm. 
Type locality. — Monmouth, Maine (Lake Wilson). The 
type is a male, collected and gi\’en me by Mr. C’. A. Frost, and 
Lears tlate “IX-4-17.” 
The folloAving localities are represented in my series: Maint' 
(Monmouth): ^Massachusetts (Natick; iMontert'y — Frost): Con- 
necticut (Litchfield — Woodruff): Noav Jersey (Clementon; 
Lake Hopatcong): Nety York (Ithaca): PennsylA'aniti (Phihi- 
(hdphia Neck): Louisiana (Winnfield — (1. R. Pilate). 
A single pair of specimens from Louisitina has Ixmmi stam: 
the male is normal in eA'ery Acay, thefemah', hoAvt'A’t'r, is distinctly 
bronzed OA'er the entire surface. 
With a little exjterienta* this \'('ry distinct si)('ci('s may usually 
b(“ I'ecognizcal by its ratluu’ broad lorm, distinctly gibbous in 
pi'ofile, and tlu' relatiA’cdy dull surhicc' lustei': llu' male geMil;ifi:i 
ai'c uniepu*. TIuma' is a bar(' |)ossibilit >' that this sjua-ii's ni.ay 
TU.AN,S, AM. ENT. SOC., XEA II. 
