1878.] 599 [LeConte. 
slightly scabrous, vertex slightly elevated and convex, surrounded by a 
shallow curved impression. Prothorax campanulate, with the dorsal and 
lateral strize deep ; behind the middle between the striw each side is an 
acute conical tubercle, and still nearer the base two very small teeth. Ely- 
tra indistinctly and sparsely punctulate. Antenne with the joints 3-8 not 
longer than wide, 9th and 10th rounded gradually larger, 11th still larger, 
oval, pointed. Hind tibie with long terminal spur. Length 2 mm.; .08 
inch. : 
3 Head finely scarbrous, front protuberant anteriorly and retuse, with 
an apical concavity. 
Q Head nearly smooth, vertex entirely smooth, front gradually decliv- 
ous not prominent. 
Detroit ; one pair. Sufficiently distinct by the feeble sculp- 
ture of the head, and the absence of antennal sexual char- 
acters. 
19. Orthoperus scutellaris. Oblong-oval, slightly convex, pic- 
eous, black, glabrous, not very shining. Scutellum large, very distinct. 
Elytra narrowly margined behind with testaceous. Length .7 mm.; .027 
inch. 
Michipicoton River, north shore of Lake Superior; also 
found in Illinois, and abundantly in British Columbia, at 
Lake Labache. This species is double the size of O. glaber, 
and less rounded. It is recognized at once by the very dis- 
tinct seutellum. 
Under a high magnifying power the elytra are seen to be 
finely strigose, and very sparsely and indistinctly punctulate. 
20. Orthoperus suturalis. Oval, rounded, slightly convex, pice- 
ous black, glabrous, shining. Scutellum distinct. Elytra with a very fine 
sutural stria slightly visible from the middle to the tip. Length .5 mm.; 
.02 inch. 
Enterprise, Florida. Smaller, or of the same size and 
form as O. glaber, but easily known by the distinct 
secutellum, and fine sutural stria. The elytra are very 
sparsely and indistinctly punctulate as in the preceding. 
21. Orthoperus elongatus. Oblong-clongate, slightly convex, 
piceous, moderately shining. Scutellum distinct. Elytra with a very 
fine sutural stria effaced behind, but curving in front around the base and 
ending half way between the scutellum and the humerus ; tips separately 
rounded, with the apex of the abodomen more prominent than in the 
other species. Length .56 mm.; .02 inch. 
