DYNASTIISLE 235 



black, pale castaneous beneath; head (cf ) two-fifths as wide as the 

 prothorax, unusually short, very coarsely, densely punctato-rugose, 

 the clypeus much less coarsely and rufescent; concavity between the 

 eyes distinct; clypeal apex rather acute but not distinctly reflexed, 

 having two fine, posteriorly diverging carinse, with a concavity be- 

 tween them; prothorax nearly three-fourths wider than long, the 

 sides broadly rounded, becoming straighter and strongly converging 

 in about anterior half, the basal angles rather broadly rounded; 

 concavity deep, moderate, a third the width and half the length, at a 

 distance from the apex equal to a fourth to third its own length, its 

 sculpture, as well as that of the general surface, somewhat as in 

 inflatus, the tubercle small, feeble, very obtuse and generally feebly 

 bifid; scutellum moderate, smooth, with a few coarse punctures at 

 base; elytra a fifth longer than wide, broadly inflated behind the 

 middle, the sides thence rather obliquely and moderately rounded 

 to the apices, which are individually rounded, a third or fourth 

 wider than the prothorax and much more than twice as long, the 

 sculpture nearly as in the preceding species but stronger, especially 

 toward the sides, where the series of moderate punctures are rather 

 conspicuous; pygidium much shorter and more transvere than in the 

 two preceding male types, convex and pubescent in about basal 

 third, thence sloping and nearly smooth to the apex, which is some- 

 what sinuato-truncate at the middle. Female distinctly larger than 

 the male and a little stouter, otherwise nearly similar, except that 

 the frontal ridge is stronger, the clypeal apex simple, acute and more 

 upturned, the pronotal sculpture similarly disposed but everywhere 

 much coarser and more conspicuous, the elytra less punctate on the 

 flanks and the pygidium a little shorter, with the transverse ridge 

 above the middle very strongly elevated, the surface below it deeply 

 concave, the apex evenly arcuate and less heavily beaded, the middle 

 part of the apical bead punctured and setose (cf 1 ), or nude (9). 

 Length (2 cf, I 9) 25.0-27.8 mm.; width 13.7-15.2 mm. Arizona 



(Prescott), Oslar tantalus n. sp. 



7 Hind tarsi longer, subequal in length to the tibiae, the basal joint 

 almost as long as the width of the scutellum. Body elongate-oval, 

 very convex, polished, pale and bright red-brown equally above and 

 beneath; head two-fifths as wide as the prothorax, everywhere 

 extremely coarsely punctato-rugose, gradually very shallowly so 

 toward the clypeal apex, which is broadly and obtusely rounded, 

 the dorsal part between the fine raised margins acuminate, with the 

 apex reflexed; transverse ridge slightly tumid, feeble and indefinite, 

 not interrupting the rugosity; prothorax scarcely more than a third 

 wider than long, the sides very evenly rounded throughout, gradually 

 more converging anteriorly, the basal angles broadly rounded; base 

 strongly beaded, broadly, feebly lobed medially, the apical sinus 

 broadly arcuate medially; impression circular, deep, rugose in very 

 coarse wavy lines, not a third the total width but half the length, 

 the tubercle strong, disrupting the neighboring apical bead, its apex 

 binodose; punctures moderate and sparse laterally, the sculpture 

 anteriorly taking the form of long coarse wavy rugulosity, enclosing 



