PANTOMORUS OF AMERICA NORTH OF MEXICO 2.5. 
both of which probably typify Boheman’s 1840 incorrect interpretation of durius 
Germar. Both specimens have abdominal sternite 5 about as in tessellatus, 
but it is not altogether certain that either actually belongs to this species, 
though the writer believes that both tessellatus and pallidus are indigenous to 
South America. Pending a study of the entire group, the names tessellatus 
(Say) and pallidus (Horn) should be retained for the two species inhabiting 
the United States; their relation with the South American fauna may eventually 
become clear by the accumulation of data and of adequate series of specimens. 
Subgenus PHACEPHOLIS Horn 
Phacepholis Horn, Amer. Phil. Soc. Proc. 15: 95, 1876; Henshaw, List of the 
Coleoptera of America North of Mexico, p. 185, 1885; Pierce, U. S. Natl. 
Mus. Proe. 37: 361, 1909; Pierce, Jour. Econ. Ent. 3: 363, 1910; Champion, 
Biologia Centrali-Americana,-v. 4, pt. 3, p. 333, 1911; Pierce, U. S. Natl. 
Mus. Proc. 45: 416, 1913. 
Scaly and setose, scales sometimes metallic, setae erect; head often slightly 
constricted behind eyes, subplanate between eyes, eye rounded to elliptical 
and feebly to strongly prominent; rostrum continuous with front in profile, 
above with the median groove reaching or slightly exceeding hind margin of 
eye, latero-marginal carina feeble to rather strong, nasal plate feeble to ob- 
solescent, support on mandible prominent, scar usually facing obliquely mesad ; 
scape reaching about to or slightly beyond hind margin of eye, funicular seg- 
ment 2 usually longer than 1, sometimes subequal to it. Prothorax more 
strongly narrowed apically than in the preceding subgenera, hind margin more 
or less angulate opposite elytral humerus; pronotum feebly to strongly convex 
longitudinally, median groove usually present though often feeble, sculpture 
coarse, usually rugo-verrucose, scales sometimes arranged in radial clusters on 
the elevations (fig. 8, 1), each cluster surrounding a seta, basal margin sub- 
truncate to moderately bisinuate, basal groove usually present. Scutellum 
obsolescent to fairly large. Elytron with 10 puncture rows, humerus rounded 
to Slightly angulate, basal margin not, or feebly and broadly, prominent, setae 
rarely uniseriate, usually irregularly triseriate, on each interval, and of different 
lengths, the longer ones along middle of interval, the setae on interval 1 
averaging longer than elsewhere, scales on lateral interval usually paler and 
denser than on adjacent surface and forming a more or less distinct vitta. 
Metepisternal suture present, sometimes partly obscured by scales; abdomen 
with intercoxal piece much narrower than a hind coxa, sternite 2 of male 
usually with a short, transverse, postmedian row of denticulations (fig. 3, B), 
sternite 5 of male flattened apically, and longer and more broadly rounded 
than in female (fig. 3, B, H). Forelegs not, or slightly, elongated in male, 
at least fore tibia distinctly denticulate, middle tibia frequently, hind tibia 
sometimes, with a few smaller denticles; corbel plate rather broad, squamose 
(setose in exrimius), dorsal comb short (fig. 2, J). Spermatheca (fig. 4, G, H) 
rather feebly sclerotized and subject to considerable individual variation; in- 
ternal sac of male enormously enlarged but without conspicuous sclerotizations 
(fig. 4, J). 
Type of subgenus—Phacepholis elegans Horn, designated by 
Pierce, 1913, p. 416. 
The species of Phacepholis inhabit the Great Plains region from 
Tilinois to Montana and southward to southern Texas. 
The well defined, squamose corbel plate and the short dorsal comb 
distinguish Phacepholis from any other subgenus of this group in 
the United States. 
The male, which is known for all the species, can be recognized by 
the longer and more broadly rounded sternite 5 and in most species 
by the presence of denticles, or of a feeble transverse ridge, on ab- 
dominal sternite 2. In addition, the male often has the body smaller 
and narrower than in the female, the rostrum more deeply sculptured 
and a trifle longer, the head more narrowed behind eyes, the pro- 
thorax more inflated laterally and larger compared with elytra, 
the pronotum more strongly convex longitudinally and with its basal 
