H. C. P’ALL 
279 
2. Gyrinus rockinghamensis L(>(’()iilo 
\'ery closely allied to niinulu.s, and eousideix'd l)y Ux'giiubart 
and others as only a varietal form of that widely dispersed spe- 
cies. The two seem to be alwa3's separable, however, and I am 
disposed to consider rockingJunnensis distinct bj" the tdllowing 
characters. 
Size slightly smaller on the averagt', color honeatli entirely pale, nieso- 
sternum feebly sulcate, lateral stria of elytra less close to the margin, oedeagns 
more obtusely rounded and less acutely not (died at tip. 
Length, 3.4 to 4.3 mm.; width, 1.75 to 2.2 mm. Although the largest and 
smallest individuals before me are practically identical in size with those of 
ininulua, the average length for rockinglnuneusis scarcely exceeds 3.8 mm., 
while for minutuH it is about 4 mm. 
Type locality. — Rockingham, North Carolina. 
This species appears to be confined to the Atlantic Coast 
region, ranging from Alassachusetts to Florida. Specimens 
before me bear labels, Wakefield, Alass., N. J., and Rilh^’s Is- 
land, Okefenokee Swamp, Georgia (J. C. Brtidle^d- 
3. Gyrinus ventralis Kirby 
t)f medium size and convexity, highly jiolished black, often with bluish 
reflections, .sides bronzed; body beneath nearly uniformly rufous or rufo-tes- 
taceous; upper .surface without noticeable alutaceous sculpture or minute' 
jiunctulation, except under high jiower; eleventh elytral stria well up irom 
the margin. 
Male genitalia. Color rufo-testaceous like that of ttie ventral surface'; 
median lobe broader at apex than the lateral lobes, the tip subtruncafe with 
a short median process and well dehned lateral angles. 
Length, 4.8 to 5.9 mm.; width, 2.5 to 3.2 mm. The great majority of 
specimens he between 5 and 5.5 mm. 
Type locality . — British America, “latitude 54°. ” 
Specimens have lieen seen from Maine (Alomnouth); Massa- 
chusetts (Tjmgsboro, Wakefield, Attlebcjro, hrainingham, Alon- 
terejO ; Connecticut (Litchfield); New York (Ithaca, River- 
head, Long Island, ('haumont River); New Jcr.sev’- (Ltike Ho- 
patcong); jMichigan (Pontiac); Ontario (Ottawa). 
This species is a common one in Alassachusetts, and prob- 
ably throughout the territoiy from New England to the I pp('r 
Lakes. Oddl}^ enough not a single s])ecimen was toimd in the' 
extensive material collected by' AIi'. A allis on his trip fiom 
innijteg up along tlu' line* ol the Hudson l>ay Railvay, ;il- 
though this region is closest to tlu' t_vp<‘ locniity ol ntiv Irom 
which I have received Cvuini. 
TR.\XS. .VM. EXT. HOC., XLVII. 
