4 
On 
ay 
10. 
7 bs 
MISC. PUBLICATION 417, U. S. DEPT. OF AGRICULTURE 
Body moderately stout (2.78 to 2.95 times as long as wide), sculpture 
not so rough; elytral striae weakly to moderately impressed, inter- 
spaces flat to convex, moderately to finely rugose- or granulate-punc- 
tate; ninth interspace moderately to strongly elevated behind_________ 
. Pronotum nearly as wide as elytra, with sides strongly arcuate; strial 
DUNChULES Moderately COA TSC me eee eer, salebrosus Hichhoft 
Pronotum distinctly narrower than elytra, with sides nearly straight 
and evenly narrowed on posterior two-thirds; strial punctures usually 
MET AE! Seer Aes © ee, RES Sol ee ey ey eC es ____scobinosus Hichhoff 
. Color red when mature; body moderately stout (2.8 times as long as 
wide) ; elytral interspaces wider than striae, flat on disk and sides, 
granulate; ninth interspace strongly elevated behind; last sternite of 
male flattened, not grooved___ pi bh US Hd eget gS = 2 ok 2 ruber Swaine 
Color piceous to black when mature; body more slender except in 
canadensis, n. Sp., and subopacus, n. Sp.; elytral interspaces weakly to 
moderately convex, granulate or rugose; last sternite of male im- 
pressed-and pubescentin median linewa 2S a Se ee eee eee 
. Elytral interspaces convex on disk; ninth interspace moderately 
strongly elevated thelind. 22221 8. 2). wae ee A eS ee eee 
Elytral interspaces moderately convex on disk; ninth interspace only 
weakly, elevated behind se. © AS ee ee ee 
. Pronotum stout, very slightly narrower than elytra, with sides evenly 
arcuate; surface subopaque, rather finely, very closely punctured; 
elytral interspaces equal te or wider than striae; declivita] pubes- 
cence abundant and scaielike; New Mexcio____swbopdacus, new species 
Pronotum distinctly narrower than elytra, with sides not eveniy arcu- 
ate; surface shining, moderately to coarsely punctured; elytral inter- 
spaceS narrower than striae (except in yukonis Fall); declivital 
pubescence usually scanty, scalelike or hairlike____________________ 
. Pronotum much narrower than elytra; punctures of moderate size and 
very close; sutural interspaces wider and elevated on elytral declivity 
webbi, new species 
Pronotum slightly narrower than elytra; punctures coarse, moderately 
close ; sutural interspaces slightly narrowed on elytral declivity________ 
. Frons with median carina sharply elevated, often extending well above 
the strong transverse impression; median line of pronotum strongly 
developed; sutural interspaces of elytra not elevated on declivity ; 
HastermeS Gatesess . 35st oo8 ae Le a Se. a ee porculus Erichson 
Frons with median carina usually confined to epistoma; transverse 
impression moderate, often forming a pitlike depression in median 
line; median line of pronotum weakly developed or lacking; sutural 
interspaces of elytra elevated on declivity; Western States_________ 
Median carina of frons poorly developed; sculpture rather coarse; 
elytra with strial punctures rather coarse; striae as wide as or wider 
thany-interspaces Sis ee fe wea eS Ae ee ae nigrinus Mannerheim 
Median carina of frons sharply elevated; sculpture notably finer; elytra 
with strial punctures rather small; striae not so wide as interspaces 
yukonis Fall 
Pronotum much narrower than elytra, only slightly wider at middle; 
surface shining; punctures moderate, irregular in size on disk, 
Strongly granulate at sides; elytra shining, interspaces strongly 
granulate; Colorado, New Mexico____________________ asper Swaine 
Pronotum nearly as wide as elytra, distinctly wider just behind middle; 
surface subopaque; punctures small and not so close on disk, only 
feebly granulate at sides; elytra subopaque, interspaces very feebly 
granulate; Manitoba, Canada_______-________ canadensis, new species 
. Body 4.6 to 6.5 mm. long, Subopaque to feebly shining; sculpture mod- 
erate to coarse; pronotum with median line narrow, elevated; first 
elytral striae notably deeper and wider than others___________________ 
Body less than 4.5 mm. long, moderately to brightly shining; sculpture 
rather fine; pronotum with median line narrow and searcely elevated, 
often lacking; first elytral striae not notably deeper and wider than 
others «(except ini mitidus Sw. iiss 22 22h) bo eae oe AE ee eee 
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