170 Trans. Acad. Set. of St. Louis. 



the eleventh more elongate than in the preceding species; prothorax 

 opaque, less transverse, one-third wider than long, the punctures fine, 

 feeble and rather more close-set than in valida; elytra nearly similar in 

 form but more shining, the punctures fine but stronger and very dis- 

 tinct, moderately close-set; sides scarcely as long as those of the pro- 

 thorax, the suture two- thirds as long as the median line; abdomen 

 polished, as wide as the elytra, finely, sparsely punctured in apical half 

 of the tergites; hind tarsi about three-fourths as long as the tibiae, the 

 basal joint about one-half longer than the second and three-fourths as 

 long as the fifth. Length 7.8-9.5 mm.; width 1.75-2.2 mm. California 

 (Los Angeles and San Diego) californica Csy. 



5 — Body large and very stout, subparallel, black, the elytra pale but dull 



rufous, blackish at the basal margin ; abdomen piceo-rufous at tip, the 

 legs dark piceous, the antennae piceous-black throughout; head opaque, 

 strongly but rather sparsely punctured except along the middle as usual, 

 two-thirds as wide as the prothorax; antennae very stout, rather 

 strongly incrassate distally, not quite as long as the head and prothorax, 

 the second joint much shorter than the third, the tenth fully two -thirds 

 wider than long, the eleventh comparatively small, pyriform; pro- 

 thorax opaque, finely but strongly, moderately closely punctured, two- 

 fifths wider than long; elytra less opaque, distinctly broader than the 

 prothorax, the sides as long as the sides of the latter, the suture two- 

 thirds as long as the median line, the punctures flue but distinct, 

 moderately close-set; abdomen nearly as wide as the elytra, parallel, 

 finely, rather sparsely punctured in about apical half of all the tergites; 

 mesosternal process very wide, arcuate at tip, nearly as in valida; hind 

 tarsi two-thirds as long as the tibiae, the basal joint fully one-half 

 longer than the second and four-fifths as long as the fifth. Length 8.0- 



11.0 mm.; width 1.9-2.8 mm, Arizona ponderosa n. sp. 



Body smaller and more slender; coloration as in ponderosa but with the 

 tip of the abdomen bright and pale rufous; head and pronotum opaque, 

 finely but very distinctly punctate, the former well developed, orbicular 

 as usual, nearly three-fourths as wide as the prothorax, the antennae 

 nearly as in ponderosa, the prothorax nearly similar but with the punc- 

 tures more close-set; elytra alutaceous, black toward the scutellum, 

 at the sides not quite as long as the sides of the prothorax, the suture 

 barely two-thirds as long as the median line, the punctures fine, rather 

 feeble and moderately sparse; abdomen punctured nearly as in ponde- 

 rosa; mesosternal process less broad and more truncate at tip, the apex 

 of the metasternal process much broader than the tip of the mesosternal 

 and broadly emarginate in circular arc as usual; hind tarsi nearly as 

 in ponderosa. Length 7.0 mm.; width 1.65 mm. Arizona (Benson), — 

 G. W. Dunn rnficanda n. sp. 



6 — Body somewhat slender, black, the elytra obscure rufous, generally 



blackish at the sides and base; legs rather pale, the antennae darker, 

 brownish-rufous; integuments opaque, the elytra less so and the ab- 

 domen shining; vestiture longer and more abundant than in any of the 

 preceding species; head orbicular, much narrowed at base, the basal 

 parts not more shining except toward the sides; antennae about as long 

 as the head and prothorax, rather strongly incrassate distally but 



