NORTH AMERICAN COLEOPTERA. 
33 
moderately deep, arcuate, liasal marginal line entirely absent; elytra 
oblong, nearly 2 mrallel, humeri slightly dentate, surface moderately 
deeply striate, strije obsoletely punctate, intervals very slightly con- 
vex ; beneath similar in color, abdomen finely alutaceous, indistinctly 
punctate at sides in front. Length 10-11 mm. ; .40-.44 inch. 
In the male the hind trochanter is about half as long as the femur 
and obtuse at tip. 
Two sjiecimens have been examined, taken by Mr. L. E. Rick- 
secker at ISylvania, Cal. 
This species is evidently closely related to longissimus Bates (Biol. 
Cent. Am. i, p. 81, pi. iv, fig. 6), although that species is said to have 
non-dentate humeri. Direct comparison will be necessary to indicate 
the real differences, as it can hardly be supiiosed that an almost 
blind species from middle California is identical with one from 
Guatemala. 
The two species above described constitute, with migustus, a small 
group of Pterostichus, characterized especially by a very narrow, 
almost parallel form. All have small eyes, although they vary in 
size in the three species. Of the three itianis has the largest eyes, 
and caligans the smallest. 
The characters separating them may be tabulated in the following 
manner : 
Thorax witli two distinct linear basal impressions, the basal marginal line entire ; 
hind trochanters of 'J, longer than half the femur and very acute at tip; 
scutellar stria rarely well marked, often absent inaiiis. 
Thorax with two basal impressions, the outer quite short, basal marginal line 
variable, sometimes entire, often visible near the angles only; hind trochan- 
ters of male half as long as the femur and obtuse at tip; scutellar stria dis- 
tinct august us. 
Thorax with but one basal Impression, the basal marginal line entirely wanting; 
hind trochanters of male as in angustus ; scutellar stria distinct. .caligaiis. 
The last species resembles in a marked degree, small sj^ecimens 
of Stenoraorpkus rufipes. 
I*. Blaiieliardi n. sp.— Form rather robust, piceous, shining, legs and 
antennfe rufo-testaceous Head smooth, frontal impressions short; thorax cor- 
date, wider than long, sides strongly arcuate, rather deeply sinuate posteriorly 
the hind angles rectangular, surface smooth and shining, without punctures at 
base, median line fine and entire, basal impressions single, deep, straight, ex- 
tending nearly a third to the front, basal marginal line entire and very distinct ; 
elytra rather broadly oval, more acute behind, moderately convex, humeri not 
dentate, striae rather deep, distinctly punctured, the sides of the intervals slightly 
(5j 
TRANS. AM. ENT. SOC. XVIII. 
FEBRUARY, 1891. 
