298 
NORTH AMERICAN GYRINUS (COLEOPTERa) 
treine variant of this sort, as it shows no other (_listinguishin»: 
characters. Pernitidiis should not be difficult to recognize 
among the species of its own region with lilack under-body. It 
is perhaps most likely to lie confounded with analis, but the 
latter is a narrower, less convex and more aeneous species, and 
neither it nor any other species with black under surface occur- 
ring in the Atlantic reaion is completely devoid of alutaceous 
sculpture in both sexes, as is virtually the case with pernitidus. 
20. Gyrinus picipes Aube 
Of average size and moderate eonvexity; highly polished black with .sides 
>listi!ictly bronzed. Some speeiniens appear to be absolutely smooth, others 
show an extremely fine alutaceous sculpture, barely or scarcely detectable 
except towards the apex; there is also ])resont or not an excessively minute 
punctulation which is of variable visibility. Strial punctures very fine near 
(he suture, evidently larger at sides. Body beneath metallic black, the 
e])ipleura freciueidly tinged with rufous; anal segment more or less rufous or 
rufesceid.. 
Male (/<->dl(di(i. Brown or piceous brown; middle lobe about one-third as 
wide as the lateral lobes api(adly, ui)per surface flattened before the apex 
and with a very minute obtuse prominence at the extreme tfi). 
Lcnglh. — 4.7 to 6 mm.; width, 2.G to 3.2 mm. 
Type locality . — Norfolk Hound. 
I have .seen examples from the following localities: Alaska 
(Sitka — LeClonte C-olh; Homer): British Ckilumbia (IMeBrido 
and Cawston) : Washington ( Port Townsend and Olymitia) : 
California (Humboldt County; Alhambra Valley, Contra Costa 
('ounty; Crystal Springs, San Alateo County; Kernville; Alt. 
Kaiser, 9()()() ft., Fresno County); Alberta (Banff): Alanitoba 
(Mile 20(5, Hudson Bay Bailway): Alontana (Missoula). 
In the Pacific district, fi'otn British Columbia south, flu're is 
no ollu'r s))eci('s with which lliis lUH'd b(' confused, but in llu' 
mor(‘ iiorilu'rn and ('asb'rn jiaids of its range llu' mor(' shining 
('xam])les of opacas and iayena sonu'what resemble i(, 1 hough 
noi'inally, oi- in s('ries, tlu'se are both much mor(‘ evidently 
alutaceous, and tlu' strial punctuia^s of the outer rows ai'e scarcely 
larger than of those neai'er the suture. 
In his I'emarks upon picipes in his ])ai)er of 18(58, LeConte 
alludes to “tyjies from Alaska kindly sent me by Baron Chaii- 
doir and ('ount. Mnizech.” These; agree completely with 
Aube’s descri])t ion, and may, I think, be safely accepted as 
