218 PROCEEDINGS OF THE NATIONAL MUSEUM Von. 118 
6. Disk of prothorax covered with rounded punctures; scales grayish white and 
closely spaced. ... . . .. . . §. halophilus Blatchley (p. 235) 
Disk of prothorax covered ora confluent punctures, which form numerous 
oblique concentric channels; scales widely spaced. 
S. perfidus Dietz (p. 233) 
7. Head, prothorax, and elytra entirely reddish brown; prothocracic punctures 
nearly round ~ <%= = ... . . §.congestus Casey (p. 226) 
Head and prothorax always blacks elytra partly reddish, prothoracic punc- 
tfuresinot round, = 0%. » ed SS 
8. Scales of elytra closely and openly paced: PC runcs of Drothome confluent, 
interspaces forming concentric rugae which run anterolaterally from the 
midline Ss. )2.i ... . . §.vestitus LeConte (p. 232) 
Seales of elytra eadencedl into preeulat transverse bands or the different 
colors insuch bands ..... ws, 1 A ORS 
9. Elytra reddish except for a black Sng ne Pancras of iprotborae deep, 
surface of prothorax having a roughly sealpinee appearance; rostrum not 
swollen at base... .. . . . §.seulpticollis Casey (p. 220) 
Elytra black, except on Peadient vittae on the fourth to sixth intervals 
(absent in some specimens); surface of prothorax not appearing roughly 
sculptured; rostrum swollen at base . . . S. tychoides LeConte (p. 218) 
Smicronyx tychoides LeConte 
Ficures 53, 106 
Smicronyx tychoides LeConte, Proc. Amer. Philos. Soc., vol. 15, pp. 171-172, 
1876. Lectotype, here designated: Male, ‘‘Western States,’ MCZ 1905 
(J. L. LeConte collection). 
Description: Rostra of both sexes black, stout, moderately curved, 
rather thick and swollen at base; sparsely punctate and thinly covered 
with small scales behind antennal insertions; finely punctate and shin- 
ing before antennal insertions in female. Head black, finely alutace- 
ous, very finely and sparsely squamose in front. Antennal scape and 
funicle piceous, club ferruginous. Prothorax black, strongly rounded 
at sides, fairly convex dorsally, disk evenly covered with shallow, 
crescent-shaped punctures; scales very sparse, elongate, light yellow- 
ish brown; prosternum moderately emarginate and concave. 
Elytra black, usually (but not always) having a reddish vitta on 
fourth to sixth intervals; scales ovate, pale yellowish to white, con- 
densed into short vittae at base of third intervals and on humeri as 
well as in narrow irregular transverse bands. Underside of thorax 
and abdomen thinly covered with small ovate white scales. Femora 
moderately clavate, black at their bases, otherwise ferruginous; 
thinly covered with scales similar to those of femora. ‘Tarsi rufopice- 
ous, first three segments short and broad; claws small, almost parallel. 
Stem of spiculum ventrale of female genitalia only slightly expanded 
at its anterior end (fig. 106). 
8 Smicronyz fiducialis Casey will key to couplet 9, but has not been included in this key because the abraded 
condition of the only known specimen leaves the nature of its color pattern somewhat uncertain. 
