38 MISC. PUBLICATION 341, U. S. DEPT. OF AGRICULTURE 
strut and about the same shape as in the Pueblo male. The shape of 
the spermatheca varies considerably in different specimens. 
Pantomorus planitiatus differs from candidus by having longer, 
finer, and denser elytral setae, the prothorax usually narrowed basally 
in both sexes, the head relatively wider, the eye rotundate and more 
convex, and funicular segments 1 and 2 subequal. Minor and average 
differences between these two species are as follows: 
planitiatus. Vittae more often present on dorsum; rostrum above less deeply 
impressed, latero-marginal carinae feebler, median groove finer; pronotal sculp- 
ture not so coarse, the radial clusters of scales more numerous and regular, 
basal margin more feebly sinuate; elytral intervals less convex; sides of elytra 
of female more nearly parallel. 
candidus. Color more nearly uniform; rostrum above (especially in male) 
more concave, latero-marginal carinae stronger, median groove coarser; pro- 
notal sculpture coarser, the radial clusters of scales fewer and more irregular 
in size and placement, basal margin more strongly sinuate; elytral intervals 
more convex; sides of elytra a little more rounded. 
From obscurus, planitiatus differs in its larger size, usually paler 
color, somewhat shorter elytral setae, the presence of a median groove 
on the pronotum, and the more numerous spinules in the distal comb. 
(14) PANTOMORUS (PHACEPHOLIS) OBSCURUS (Horn) 
(Figs. 3, C, F, K; 4, I, M) 
Phacepholis obscur@ Horn, Amer. Phil. Soc. Proc. 15: 96, 1876; Henshaw, List 
of the Coleoptera of America North of Mexico, p. 185, 1885; Pierce, U. S. 
Natl. Mus. Proce. 37: 362, 1909; Pierce, Jour. Econ. Ent. 3: 363, 364, 1910. 
Pantomorus (Phacepholis) obscurus (Horn), Pierce, U. S. Natl. Mus. Proc. 45: 
417, 419, 1913. 
Length 4-5.5 mm. Fuscous or lighter brown to gray, pronotum with a lateral 
whitish stripe opposite eye, head usually with a pale patch above eye; elytra 
usually very irregularly mottled with fuscous and gray, the darker specimens 
with pronotum fuscous and elytron with irregular grayish to brownish tessella- 
tions on disk, the paler specimens with broad median and sublateral, indefinite, 
brownish stripes on pronotum, and darker mottlings or tessellations on elytra, 
the elytral marks sometimes confined to the even intervals; elytron sometimes 
largely gray, with a dark line on base of interval 4; scales dense, those on 
elytra usually overlapping; dorsal setae longer than in any other species of 
Phacepholis. 
Rostrum above with latero-marginal carina moderate to feeble, often scarcely 
perceptible beneath the scales, intercarinal area subplanate; eye rounded and 
rather strongly convex in both sexes; scape hardly exceeding eye, funicular 
segments 1 and 2 usually equal or 1 a little longer than 2, rarely 2 slightly 
longer than 1. Prothorax wider than long (though in an occasional male vir- 
tually as long as wide), sides rounded, convergent basally in both sexes; pro- 
notum finely rugo-granulate, sculpture finer and more regular than in candidus, 
scales forming several to many radial clusters, setae erect, median groove obso- 
lescent, basal margin subtruncate to faintly bisinuate, basal groove usually 
complete or nearly so, hind angles sharp, slightly projecting laterally. Secutel- 
lum variable in size, scaly. Elytron not thickened on basal margin, humerus 
rounded; intervals subplanate to feebly convex, interval 1 sometimes slightly 
prominent basally, each interval with an irregular double or triple row of long, 
fine, tapering, whitish to fuscous setae, the longer ones very conspicuous, the 
length of each longer one greater than the width of the interval, some of the 
setae minutely forked apically; setae in serial punctures slender to broad; 
lateral interval often with a stripe of pale to whitish scales. Metepisternum 
distinct, a little shorter than in candidus and planitiatus; abdominal vestiture 
finer and sparser medially in male; sternite 5 shallowly emarginate at apex in 
female, much longer and with apex broadly rounded to truncate in male, sternite 
2 of male with one to five (usually two, three, or four) moderate-sized denticles 
and sometimes one to a few minute ones in addition. Fore tibia with several 
spinelike teeth (fig. 3, K) that are relatively longer than in any other species 
of Phacepholis, middle and hind tibiae of male with a few shorter teeth, middle 
