136 Trans. Acad. Sci. of St. Louis. 
the apex, gradually formed, with the angle distinctly rounded, the lobes 
of the apex evenly and rather strongly rounded. Length 4.6-5.4 mm.; 
width 0.88 mm. Iowa and Nebraska (Lincoln)....gracilicornis n. sp. 
Antennae distinctly less than half as long as the body; the medial joints less 
CIONZALE 000 cocccccceccceccccce ross cvcescecsseesccess ccccccccense eck 
4 — Prothorax smaller when compared with the elytra, its sides frequently 
AlMOSt StrAight..cccessccccsvcevccvccscesevscsvcsere sevevcsccecececceh 
Prothorax larger, the sides parallel and always distinctly arcuate........6 
5 — Prothorax parallel and broadly arcuate at the sides; body moderately 
stout, convex, polished, bright rufous, the legs and antennae pale, the 
head black, the abdomen piceous-black, dull rufescent at tip; head as 
long as wide, parallel and straight at the sides, with broadly rounded 
basal angles, coarsely and sparsely punctate; antennae in the male as 
long as the prothorax and elytra combined, only moderately slender, 
scarcely at all incrassate, the medial joints three-fourths longer than 
* wide, a little shorter and thinner in the female; prothorax in the male 
only slightly elongate, rather distinctly wider than the head, finely but 
distinctly, very sparsely punctate, the punctures irregularly subserial 
along the smooth area, narrower in the female, with the sides almost 
straight; elytra distinctly longer than wide, the sides subparallel and 
almost straight, fully two-fifths wider and longer than the prothorax 
in both sexes, the punctures not coarse but distinct, arranged in regu- 
lar and scarcely impressed series almost throughout; abdomen much 
narrower than the elytra, densely punctulate. Male with the fifth 
ventral unmodified, the sixth glabrous and very faintly impressed along 
the middle, the apex with a very small triangular emargination, slightly 
wider than deep, with its angle narrowly rounded, about a sixth 
or seventh as wide as the apex, the lateral lobes strongly rounded; 
female with the sixth ventral broadly parabolic at tip. Length 5.7 
mm.; width 0.95 mm. Oregon........+e+++e++ee+-- OFEQONENSIS ND. Sp. 
Prothorax parallel and virtually straight at the sides—at least in the 
female; — body rather more slender and parallel, bright rufous through- 
out, except the head which is black, the piceous-black abdomen rufes- 
cent at tip; head rather well developed, somewhat wider than long, 
parallel at the sides, the basal angles only moderately broadly rounded; 
eyes rather prominent, well developed, the punctures coarse and sparse; 
antennae in the female but little longer than the head and prothorax, 
rather thick, distinctly inerassate distally, the medial joints two-thirds 
longer than wide; prothorax distinctly elongate, only slightly wider 
than the head, the sides subparallel and straight, the punctures un- 
usually coarse, deep and conspicuous and only moderately sparse; 
elytra parallel, slightly elongate, a third wider and longer than the 
prothorax, with moderate punctures not very close-set in regular 
impressed series, confused toward tip; abdomen distinctly narrower 
than the elytra. Male unknown. Length 5.5 mm.; width 0.9 mm. 
Tennessee (Nashville)...seceececccs secs cnceccccccvees secs fdllax I. SP. 
6— Antennae nearly half as long as the body, rather thick, distinctly 
incrassate distally, the medial joints only slightly less than twice as 
long as wide; head small, as long as wide, parallel at the sides, the 
angles broadly rounded, the punctures coarse and sparse; prothorax a 
