DYNASTIN.E 201 



distinct. Body stout, oblong-oval, very shining, dark umber- 

 brown in color, the under surface and legs bright rufous; head two- 

 fifths as wide as the prothorax, rugulose, the base sparsely punctate, 

 smooth medially; carina long, fine, even, attaining the eye-canthus, 

 which is separated longitudinally from the side of the front by a 

 fine distinct suture; clypeus very finely and densely rugulose an- 

 teriorly but discretely punctate at base on the slope of the carina, 

 the approximate teeth distinct; prothorax transverse, fully three- 

 fourths wider than long, the sides almost evenly and strongly rounded, 

 more converging apically; fovea shallow, the tubercle distinct; 

 punctures notably fine, very remotely and unevenly scattered 

 throughout; scutellum very broadly ogival, three-fourths wider than 

 long, with a few minute punctures basally; elytra large, a fifth 

 longer than wide, behind the middle nearly a fourth wider than the 

 prothorax, more than two and one-half times as long, circularly 

 rounded in apical two-fifths; striae regular but not impressed, com- 

 posed of well separated, distinct but not coarse punctures, becoming 

 minute and sparse near the sides, the second stria as distinct as the 

 others, but the punctures of the subsutural interval become feeble, 

 though not effaced, basally; pygidium polished, finely, sparsely 

 punctate; hind tibiae short, strongly obconic, scarcely twice as long 

 as their expanded apex and much shorter than the femora; hind 

 tarsi fully as long as the tibiae. Length ( 9 ) 16.5 mm. ; width 9.8 mm. 

 Arizona (probably southern) arizonensis n. sp. 



Sutural stria as well developed as any of the others 18 



18 Hind tibiae broadly flaring and abbreviated, much shorter than the 

 femora 19 



Hind tibiae similarly very stout and flaring but longer, about equal in 

 length to the femora 20 



19 Body larger, obese, convex, very shining, more or less pale castaneous, 

 brighter and paler rufous beneath; head of the usual size and form, 

 black, pale anteriorly, rather coarsely rugulose, smooth at base; 

 carina well developed, sometimes with a small medial sinus in the 

 male; clypeal teeth distinct; posterior tooth of the mandibles nearly 

 twice as thick as the median tooth; prothorax short, more than three- 

 fourths wider than long, the sides straight and converging from the 

 broadly rounded basal angles to beyond the middle, there becoming 

 still more oblique to the apex; punctures strong, sparse and uneven 

 in distribution throughout; pit small but deeply impressed, polished, 

 the tubercle moderate; scutellum only a little wider than long, 

 smooth, generally with a small central fovea; elytra evidently elon- 

 gate, inflated behind equally in both sexes and there more than a 

 fourth wider than the prothorax, circularly rounded in apical third; 

 striae regular, slightly impressed, rather coarse, the punctures strong, 

 moderately coarse, confused laterally, becoming finer and closer in 

 the male; pygidium black to red, with distinct and moderately 

 sparse punctures, which are rather stronger in the female. Length 

 (cf 9 ) 12.8-15.8 mm.; width 7.6-9.7 mm. New Mexico (Alamo- 

 gordo and Albuquerque), Texas (El Paso) and southward to Durango 

 City, Mexico. Nine examples spissipes Csy. 



