334 PROCEEDINGS OF THE NATIONAL MUSEUM Vor. 118 
4. Smooth median line of the prothorax at least partly present and distinct. . 5 
Smooth median line of the prothorax absent ... . Pape ee oes, (8) 
5. Rostrum of both sexes slightly constricted before ine basil groove; scales 
of the elytra uniform in color, closely spaced. 
S. sordidus LeConte (p. 336). 
Rostrum not constricted before the basal groove; scales of the elytra widely 
spaced, light gray andtaninecolor. . . . S. floridanus (Dietz) (p. 342) 
6. Femora, tibiae, and tarsi all ferruginous: the rostra almost straight in both 
sexes, rugose punctate laterally before antennae in males. 
S. rectirostris Blatchley (p. 345). 
Femora, tibiae, and tarsi usually rufous; rostrum of the male slightly curved, 
punctate but smooth before antennae. . . S. humilis (Dietz) (p. 339). 
Smicronyx fulvus LeConte 
FicureEs 8-10, 96, 142 
Smicronyx fulvus LeConte, Proc. Amer. Philos. Soc., vol. 15, pp. 172-173, 
1876. Type: Female, Missouri, collected by C. V. Riley, MCZ 1891 (J. 
L. LeConte collection). 
Description: Rostra of both sexes black to piceous, roughly 
punctate bebind the antennal insertions; much more shining, sparsely 
punctate before the antennal insertions in the female than in the 
male. Head finely alutaceous, sparsely punctate and very sparsely 
squamose. Antennae piceous, the basal portion of the club glabrous 
and sbining. Prothorax broadly rounded at the sides, moderately 
constricted near the apex; disk closely and evenly punctate, without 
a smooth median line; scales elongate-ovate, pale fulvous; prosternum 
shallowly emarginate, transversely impressed. 
Elytra black to ferruginous, the intervals covered with small ovate 
fulvous scales. Underside of the thorax covered with grayish white 
scales; scales of the underside of the abdomen light ochreous. Femora 
ferruginous, strongly clavate, covered with grayish elongate-ovate 
scales. Tibiae stout, ferruginous, covered with narrow, whitish scales; 
hind pair distinctly dilated at the apex. Tarsi rufopiceous, fourth 
segment extending considerably beyond the third; claws connate at 
the base, moderately divergent. Median lobe of the male genitalia 
gradually narrowed from base to apex. Stem of spiculum ventrale of 
female genitalia curved and somewhat expanded at the anterior end 
(fig. 142). 
MerasurREMENTS: The following measurements were taken from 4 
males and 3 females from the Sierra Ancha Mountains, Ariz. (CAS), 
1 male from Topeka, Kans. (USNM), and 2 males and 5 females from 
Wyandotte Co., Kans. (CAS). All measurements are in millimeters: 
