290 
NORTH AMERICAN GYRINUS (cOLEOPTERA) 
may have to be united under the older name^ — consobrinvs. At present, one 
has only to look at the locality label to distinguish them. 
Male genitalia . — The same as in aquiris, except as noted above. 
Length, 4.9 to 5.7 mrn.; width, 2.6 to 3.15 mm. 
Type locnlity.—^an Francisco, California. 
The following localities are represented in my series; Shasta 
Retreat and Dunsnmir in Siskiyou County (Blaisdell), Napa, 
l^ear Lake (6000 ft., San Bernardino County — Martin), all in 
('alifornia. Provo and Salt Lake C'ity, Utah. 
16 . Gyrinus aquiris LeConte 
Of moderate size and convexity, form rather narrow, black above with 
slight bluish reflections, sides moderately bronzed, surface strongly polished 
in the male with very minute scattered punctures, visible only with a one- 
fourth inch triplet; nearly as shining in the female, with an extremely fine 
alutaceous sculpture detectable posteriorly, and with similar but rather more 
numerous minute punctures than in the male. Strial punctures only slightly 
larger in the lateral rows, eleventh stria almost strictly marginal. Body 
beiHiath reddish browm with the median areas, especially of the abdomen, 
darker. 
Male genitalia. — Rufo-testaceous, often a little darker in tint basalfy; 
median lobe apically about half as wide as the lateral lobes, obtusely carinate 
above apically, with the tip subacutely rounded. 
Length, 4.9 to 5.9 mm.; width, 2.55 to 3.15 mm. 
Type locdlily . — ‘‘Middle States.” The type ])ears a i)iuk 
disk locality label and is probably from Peimsylvania. 
The following localities are known to me — Canada (Mon- 
treal): Massiichusetts (Tyngsboro; Wakefield; Sherborn (Frost): 
New York (Ithaca; Ausable Point; Crown Point; Chaumont 
River;Tivoli — Notman;Staten Island — Davis); Wisconsin (Bea- 
ver Dam; “Wis.”). 
The characters of critical value in identifying the ]tresent 
species are the brownish oi- reddish brown ventral surface be- 
coming diffusely jialer at the margins, and the (deventh elytral 
stria very close to the margin. Two other sjiecies — leconiei 
and con.sohritius share* tlu* same characters. Lecontei inhabits 
substantially the same I’C'gion as (Kpiirin and is tlu'refore most 
likely to be (‘onfnsed with it. Wlu'ii series are compared ne/a/r/.s’ 
is (piite I'eadily s('en to be of more elongate form; the character 
is, howevc'r, a littU* ditlicult to ai)])ly with a single' indivielual e)r 
only a few spe'e'inie'iis at hanel. 'The* male* ge'nitalia :ire' epiite' 
distinct, ill the two spe'e'ie's, and if the* nu're' tip of the' eie'de'agus 
