NORTH AMKIMCAN COLIOOPTERA. 
209 
glabrous with a few small, remote punctures, finely and concentrically rugulose ; 
frontal puncture distinct. Eyes slightly convex, posterior margin moderately 
free. Prothorax one-third wider than long, base bisinnate; sides nearly straight 
and parallel from base to about the middle, rounded before the middle and 
strongly constricted behind the anterior margin, about three-fourths as wide at 
the apex as at the base ; surface densely and coarsely punctured, sparsely pubes- 
cent. Elytra subovate, almost one-third wider at the base than the prothorax, 
slightly widened posteriorly; sides broadly rounded to the apex, which is 
scarcely dehiscent aud covers the pygidium almost completely ; strife moderately 
fine, becoming deeper and wider toward the base and sides; punctures moder- 
ately large, round, and not closely approximate; interspaces feebly convex' 
smooth and scarcely pubescent ; underside with a few remote i)unctures. other 
wise as in BoUeri, but the pubescence is less marked, and the pygidium almost 
completely concealed by the elytra. Legs and tarsi as in that species. Long- 
2.2 mm. ; .09 inch. 
Hah. — Lake Superior. 
A unique female in my collection. It might be confounded with 
the preceding species, its nearest ally, but differs especially in size 
and form of prothorax. From eonfums it is distinguished by the 
much less pronounced elytral sculjtture and the intersiaices being 
smooth. 
COiiriiSii<$ n. sp. — Similar in form to A. Bolteri ; rufo-testaceous, pubes- 
cence coarser and more conspicuous. Beak a little stouter and less curved ; me- 
dian elevated line very feeble, or almost obsolete; more densely and coarsely 
punctured. Antennge stouter, second joint of funicle less elongate, but always 
longer than the third. Eyes scarcely convex, posterior margin uot free. Head 
a trifle more coarsely punctured. Prothorax constricted at the apex, bisinnate 
at the base. Elytra coarsely striato-puuctate, punctures large and round, almost 
or quite as wide as the inter.siiaces near the base ; pubescence coarser and longer ; 
undeiside, legs and tarsi as in Bolteri. Long. 2. .3— 3 mm. ; .09 — .12 inch. 
Hab. — California, Montana, Wyoming. 
The three [treceding specie.s are very closely related, but more ex- 
tensive series are necessary, to prove them as mere variations of one 
species. Two specimens in Dr. Horn’s collection, from Montana, 
which I refer to the present species, show a decided similarity to 
Bolteri in the less coarsely punctured, elytral strim, more convex 
eyes, le.ss conspicuous pubescence and larger size. 
sye<n»hant}i Walsh. — Stouter than the preceding, dark piceous. elytra 
and abdomen ferruginous, thinly pubescent. Beak not very slender, curved, 
coarsely i)unctato-strlolate ; median elevated line well marked, a lateral one less 
so. Anteuuffi stout, testaceous; second joint of funicle longer than the thii'd. 
Head convex, punctured, frontal puncture deep. Eyes feebly convex, scarcely 
free posteriorly. Prothorax transverse, two-thirds wider than long, base scarcely 
l)i-emarginate ; sides rounded behind the middle, narrowed anteriorly and con- 
stricted at the apex; surface densely and coarsely punctured. Elytra more than 
TRANS. AM. KNT. SOC. XVIII. 
(27) 
JULY. 1891. 
