230 Trans. Acad. Sci. of St. Louis. 



white spongy -pubescent sole in Stilicus. 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.; width 1.4 mm. 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 



