SMICRONYX WEEVILS—ANDERSON 205 
the cinereus group on the basis of those differences. The instabilis 
group, which is similar to the cznereus group in other respects, differs 
from the latter in having a pair of sclerotized structures on the internal 
sac of the median lobe of the male genitalia. In addition to the 
differences given in the key above, the species of the sculpticollis 
group have larger, more conspicuous spines on the internal sac of the 
male genitalia than have the species of the cinereus group (see figs. 
53-61). The male genitalia of the spretus group differ from those of 
the cinereus group in having a heavily sclerotized dorsum, and a dense 
group of spines on the internal sac (fig. 71). The quadrifer and 
profusus groups may be best distinguished from the cinereus group by 
the characters given in the key. 
Map 1 gives the distribution of this group. 
Key to the Species of the Smicronyx cinereus Group 
1. Elytral surface entirely black or piceous (in fully colored specimens). ... . 2 
lyvinaesurtaccs ati least, partly, reddish, 2 1... ays wate) os) ates ene) a0 o) eenis 4 
2. Scales of all body parts white or very light gray, sparsely distributed on 
thorax and elytra; antennal club always light rufous. 
S. pacificus, new species (p. 208) 
Scales of most body parts some shade of brown, with a scattering of white; 
antennal club) piceous ior brownish Ms ways a elise) Sel eect. ela cele 3 
3. Lateral patch of white scales on prothorax extending from base to apex; 
rostrum of the female punctate but not carinate before the antennal 
RUS CG UTOMG Bay ssdur apn 3) bs (ous. “otueiceree Gxloeich uve! etre 6 S. mucidus Dietz (p. 215) 
Lateral patch of white scales represented by a few white scales at base of 
prothorax, but absent otherwise; rostrum of both sexes carinate before the 
antennal Insertions <5 2).0.5 . 24. S. cinereus Motschulsky (p. 206) 
Map 1.—Distribution of specimens exam- 
ined of the cinereus group of Smicronyx. 
@, S. cinereus; A, S. tardus; O, S. 
mucidus; @, S. cuscutiflorae; A, S. 
obscurus; #, S. pacificus. 
