Tue PsELAPHID2 OF NorRTH AMERICA. 255 
the base it is thicker, and is conically pointed near the middle. 
Prothorax as wide as long, widest slightly behind the middle, 
evenly vaulted, the neck as wide as the base. Sides slightly 
impressed before and behind the middle, basal fovez small, 
situated at the bottom of these impressions. Middle fovez 
very small, the transverse sulcus conspicuous. /ytra'across 
the shoulders very slightly wider than the prothorax, sutural 
lines parallel, sharply turned aside near the base, leaving there 
a narrow elevated ridge. In the place of a discal line is a 
broad basal depression, leaving a basal and a humeral ridge. 
Disk very convex, sides strongly arcuate. Addomen of 4 con- 
vex, shorter, as long as the prothorax, segments nearly equal 
in length, margin narrow. Legs long, slender, posterior tibiz 
arcuate in 4, straighter in 2g. The punctures and form of the 
elytra very strongly resemble those of Bythinus burelle. 
Habitat. Alleghany Mountains. Canada. Mountains of 
Virginia. ; 
SCALENARTHRUS, Leconte. 
S. HORNI, Lec. Reddish brown, impunctate, pubescence, 
very fine sericeous. Length, 0.7 mm. Plate VII., Fig. 36 9. 
Head wider than long, eyes large, prominent, disk of the 
vertex as wide as long, frontal margin triangularly produced 
and not separated from clypeus by a transverse impression, 
supra-antennal elevations very inconspicuous, each one being 
two very minute, black-pointed, sharp-pointed tubercles. Disk 
behind the inter-antennal line flat, quadrate, with rounded 
angles, between the eyes are two hardly visible punctures 
mutually four times farther distant than from the eye. 
Between the posterior limits of the eyes are two faint trans- 
verse elevations. Antenne longer than the head and pro- 
thorax, the first and second joints nearly equal cylindrical, 
third to sixth half the size of the second, cylindrical. Seventh 
to tenth gradually increasing in size, the tenth nearly as wide 
as the second, the eleventh is fusiform, sharp-pointed, trun- 
cate at the base and half as wide as long. Pa/fi with the 
