230 Trans. Acad. Sci. of St. Louts. 
white spongy-pubescent sole in Sétlicus. The generic type 
may be described as follows: — 
Moderately stout and convex, subparallel, evenly dark red-brown in color 
throughout, the integuments densely dull in lustre, the abdomen alone 
slightly shining; punctures of the head very finely, densely and obso- 
letely granuliform above, obsolete and sparse on the under surface which 
is simply densely micro-reticulate, of the pronotum finer, still denser 
and stronger, of the elytra coarser, dense and rugose, of the abdomen 
minute, asperulate and very close-set; head large, subpyriform, the 
sides parallel and broadly, evenly arcuate, merging gradually into the 
very broadly rounded basal angles, the base truncate in median half of the 
entire width; eyes very small, not at all convex or prominent, at fully 
four times their own length from the base; under surface notably con- 
vex, the sutures impressed; antennae rather long, moderately slender, 
not distinctly incrassate, twice as long as the prothorax, the basal joint 
much longer than the next two together; prothorax but slightly longer 
than wide, three-fifths as wide as the head, the sides obtusely angulate 
and rounded just behind apical fourth, thence rather strongly conver- 
gent and nearly straight to the broadly rounded basal angles and rapidly 
converging and nearly straight anteriorly to the neck, the apex about 
half as wide as the base, the disk without trace of smooth median line; 
elytra subquadrate, rather longer than wide, parallel and broadly arcu- 
ate at the sides, four-fifths as wide as the head, only one-fifth wider and 
about a fourth longer than the prothorax; abdomen parallel, broadly 
arcuate at the sides, slightly narrower than the elytra at base but as 
much wider than the latter at the middle of its length. Male with the 
fifth ventral virtually unmodified, the sixth with a large, circularly 
rounded sinus, occupying almost the entire apex and more than twice 
as wide as deep. Length 8.0 mm.; width1.4mm. Arizona. 
sonorinus n. sp. 
The description is drawn from the male throughout, this 
being the only sex known to me at present. 
STILICOPSES. 
This subtribe is, in some measure, intermediate between 
the Stiliciand Sunii, having the free space between the corne- 
ous floor of the anterior acetabula and the side-pieces of the 
pronotum narrower than in the former, while in the Sunii 
these parts are connate. On the whole, the species bear a 
closer general resemblance to the Sunii than to the Stilici, 
however, and the reality of this affinity is further affirmed 
by the structure of the antennae and palpi, by the united 
