168 Trans. Acad. Sct. of St. Louis. 
distinctly wider than the prothorax though less obviously so in hum- 
boldti, the prothorax very faintly obtrapezoidal and distinctly wider 
than long, with the sides nearly straight...+...sscccccccceescesecee F 
Y— Punctures sparse, the surface more shining; body notably stout, black- 
ish-piceous in color, the elytra paler and generally bright rufous, the 
legs testaceous; head large, the antennae as long as the head and pro- 
thorax, the elytra distinctly wider than the prothorax and as wide as 
the head, rather longer than wide; gular sutures fine, straight and 
parallel, approximate though sensibly separated and not impressed. 
Sexual characters of the male identical with those of shastanicum, the 
sinus of the fifth segment about two-thirds as wide as the segmental 
apex but with the process virtually similar. Length 4.0 mm.; width 
0.95mm. California (Sta. Craz to Lake Co.)........latinsculum Csy. 
Punctures close-set, the surface more alutaceous; body less stout....... 8 
8— Body more evenly parallel, the prothorax notably larger and only 
slightly narrower than the head .or elytra, blackish-piceous, the pro- 
thorax, elytra, legs and antennae paler and piceo-testaceous; elytra 
obviously longer than wide, a fourth wider and rather more than one- 
half longer than the prothorax; gular sutures very approximate and 
distinctly impressed. Sinus of the fifth ventral broad and well devel- 
oped but not very deep, the process scarcely at all more than one-third 
of its total width, broadly sinuate with rounded angles, its sides but 
feebly divergent to the base; fimbriate sides only very feebly, evenly 
curved and but slightly narrower than the process; surface of the seg- 
ment feebly flattened toward the middle throughout, the flattened area 
more finely and sparsely pubescent. Length 4.2 mm.; width 0.8 mm. 
California (Sta. Clara Co.) ..+.sseescecse sees ceecce sees malacum Csy. 
Body less evenly parallel, the elytra being notably wider than the head and 
a fourth wider and one-half longer than the prothorax, not longer than 
wide, still more finely and closely punctured, dark rufo-testaceous, 
the head and abdomen blackish, the legs pale; abdomen notably nar- 
rower than the elytra; gular sutures fine but distinct, not distinctly 
impressed, very narrowly separated. Sinus of the fifth segment nearly 
as in malacum, but with the fimbriate sides evenly though more strongly 
curved, only slightly narrower than the median process, which is more 
broadly sinuate and nearly parallel-sided; surface of the segment not 
modified. Length 3.8 mm.; width 0.75 mm. California (Humboldt 
C03) -o:n's'a isn b dsb od bene e bee o pdjeweh ebony Ohde nt yecm egy s MOLE DAD, 
§—Gular sutures almost completely contiguous and distinctly impressed ; 
head large, with the basal angles broadly rounded, notably wider than 
the Prothorax ..... cece vecccvcccscevesccsvecccnssccccsscovcsesessse ll 
Gular sutures very narrowly but perceptibly separated and not or very 
feebly impressed; head only very slightly wider than the prothorax; 
Species Smaller in SiZC...esceecceececee sececccrcecccccssesevecssevell 
10 — Sinus of the fifth segment about three-fifths as wide as the apex, only 
moderately deep, the median process somewhat less than half as wide 
as the sinus, with rounded lateral angles, sinuate throughout almost in 
circular arc, the sinus five or six times as wide as deep; sides of the 
process slightly diverging to the base, the fimbriate sides of the 
sinus rather strongly curved. Body finely, not very densely punctate, 
