DYNASTIN^E 155 



width, broadly, feebly sinuate medially, deeply sinuate at the sides; 

 prothorax about twice as wide as long, in form nearly as in the pre- 

 ceding and similarly punctured; basal bead rather thick, wholly 

 obliterated medially; scutellum small, slightly wider than long, 

 ogival, with very arcuate sides, finely, feebly, sparsely punctate; 

 elytra oval, two-fifths longer than wide, fully a third wider than the 

 prothorax, the sides arcuate; punctures rather large, impressed, 

 confused suturad but in rather regular and moderately impressed 

 series elsewhere; punctures of the regular abdominal series not 

 very small; hind tarsi small, not three-fourths as long as the tibiae, 

 Length (9 ) 9.7 mm.; width 4.8 mm. Arizona. A single example, 

 without further indication of locality ambiens n. sp. 



Form elongate, rather slender and parallel, moderately convex, slightly 

 shining, pale brownish-flavate, the prothorax slightly more rufous; 

 head (cf) fully three-fifths as wide as the prothorax, black, including 

 the basal part of the clypeus; punctures fine, sparse, large, confused 

 but very shallow behind the suture; eyes separated by but little more 

 than twice their width; clypeus two-fifths wider than long, feebly 

 trapezoidal, with feebly bisinuate sides, feebly arcuate apex with 

 rather broadly rounded angles, nearly smooth and very gradually 

 strongly reflexed anteriorly, the lateral concavities not extending 

 quite to the base; medio-basal part feebly, broadly and gradually 

 convex, shallowly rugulose in irregular transverse lines; suture 

 strong, deep and entire, broadly sinuate medially; antennal club 

 strongly curved, distinctly longer than the stem; prothorax four- 

 fifths wider than long, in form nearly as in the preceding two species, 

 the fine but distinct punctures less sparse, the fine basal bead only 

 visible toward the sides; scutellum wider than long, acutely ogival, 

 finely, rather sparsely punctulate; elytra almost one-half longer than 

 wide, not distinctly wider than the prothorax, parallel, with feebly 

 arcuate sides and broadly, unusually obtusely rounded apex; punc- 

 tures small, feeble, sparse, arranged in very irregular unimpressed 

 series, except toward the suture; pygidium convex, shining, with 

 very close-set but distinct punctures, bald; punctures of the regular 

 abdominal series rather strong; claw-joint of the anterior tarsi very 

 short as usual in this section, not quite twice as long as wide; hind 

 tarsi short, scarcely as long as the tibiae. Length (cf ) 10.3 mm.; 

 width 4.7 mm. Texas (Austin). A single example, taken by the 

 writer marcida n. sp. 



8 Head (c?) smaller, less than half as wide as the prothorax; body stout, 

 convex, the coloration and sculpture as in the preceding species; 

 head rufous, infuscate basally, finely, sparsely punctate, rugose 

 anteriorly; eyes separated by scarcely more than twice their width; 

 clypeus rugose, two-fifths wider than long, feebly trapezoidal, the 

 sides feebly sinuate anteriorly, the apex rather strongly reflexed, 

 slightly arcuate, the obtuse angles moderately rounded; sides not 

 or scarcely reflexed; median line broadly, feebly impressed; suture 

 rather indistinct medially, deep and coarse at the sides; antennal 

 club longer than the stem, moderately curved; prothorax but little 

 more than one-half wider than long, the sides just visibly converging 



