216 PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 118 
Discussion: S. mucidus resembles S. cinereus Motschulsky rather 
closely in body shape and proportions, body color, and prothoracic 
punctation, but S. mucidus is slightly larger than S. cinereus, has an 
elongate patch of white scales on each side of the prothorax (not true 
of S. cinereus), and the rostrum of the female is noncarinate before 
the antennal insertions in S. mucidus (not true of S. cinereus). 
The lectotype specimens of S. mucidus Dietz, S. scalator Dietz, and 
S. cognatus Dietz resemble each other so closely in all respects that it 
is difficult for the writer to be at all confident that they represent 
distinct species. Therefore the names Smicronyx scalator Dietz and 
Smicronyx cognatus Dietz have been placed in synonymy with Smi- 
cronyx mucidus Dietz. 
DisrriputTion: The few existing records indicate that S. mucidus 
may be found in the Pacific mountain system at intermediate eleva- 
tions. The specimens examined are as follows: 
CALIFORNIA: TRINITY Co.: Island Mountain, May 14 (USNM). TuLaRE co.: 
Sequoia National Park, March (USNM). 
Total specimens examined: 3. 
SMICRONYX SCULPTICOLLIS GROUP 
Description: Body oblong ovate, rather stout (fig. 1). Rostrum 
fairly stout, moderately to strongly curved (figs. J, 3). Prothorax 
moderately to strongly rounded on sides, narrowed and sometimes 
constricted toward apex; disk punctate and/or sculptured. Elytra 
rather convex dorsally, slightly wider behind middle than at base (fig. 
1); scales unevenly distributed in bands, fasciae, or patches in all but 
S. halophilus Blatchley and S. vestitus LeConte. Median lobe of 
male genitalia either heavily or lightly sclerotized dorsally (figs. 
54-61). 
Discusston: General statements are difficult concerning the re- 
semblances or the differences between this group of species and the 
other groups of species in the subgenus Smicronyr. 'The characters 
used in the key to species groups will serve to distinguish the species 
of this group from those of the other groups on the basis of external 
characteristics. In some cases the male genitalia may be helpful. 
The median lobe of the male genitalia is known to be heavily sclero- 
tized dorsally only in some species of the S. sculpticollis group and in 
S. spretus Dietz. However, the genitalia apparently offer nothing 
else which would aid in recognizing this group of species. 
Although the species in this group do not resemble each other as 
closely as the species of some other groups do (i.e., the S. cinereus 
group), they resemble each other more closely in general body shape 
and proportions, rostral shape, and shape of the male genitalia than 
they resemble the species of other groups. None of them appears to be 
