NORTH AMERICAN COLEOPTKRA. 4( 



the angles sluui)ly proniineut, sides arcuate, sparsely fimbriate, geuse very little 

 l)romiiieiit, obtuse. Thorax twice as wide as long, very little narrowed in front, 

 sides feebly arcuate and slightly undulated, the margin in front very narrowly 

 explanate, hind angles distinct, but obtuse ; base regularly arcuate with distinct 

 marginal line ; disc convex, coarsely, closely and very regularly punctate over 

 the entire surface. Elytra a little narrower at base than the thorax, humeri dis- 

 tinctly dentiform, sides feebly arcuate, disc moderately deeply striate, the stria* 

 rather broad and catenulatelj^ punctured, intervals feebly convex at base, costi- 

 form at apex, the ninth interval costiform from the humeral unibone to a])ex. 

 the intervals very distinctly alutaceous, irregularly biseriately punctulate. Hody 

 beneath sparsely indistinctly punctulate. Mesosternum coarsely punctate, not 

 carinate. Anterior tibisb smooth in front, tridentate externally, obsoletely cren- 

 ulate above, the first tarsal joint shorter than the second. Posterior femora 

 sparsely punctate, the first tarsiil joint as long as the next three. Length .11 

 inch ; 3.5 mm. 



Male. —Anterior tibial spur stout, truncate at tip. Upper spur of middle til)ia 

 somewhat cultriform, broad with the tip prolonged inward. 

 Female. — Tibial spurs slender and acute. 



The elytral characters alone are sufficient to enable the species to 

 be readily recognized. It is the only one known to me in our founa 

 with the intervals so decidedly elevated at apex and with the ninth 

 elevated in its entire extent. The dull red elytra, the annulate cly- 

 peus and the closely ptmettired thorax are additional characters of" 

 easy recognition. 



Occurs in the soutliern part of ('alifornia (Ulke) and in Arizona. 



A. scrvsil Say. — Form moderately elongate, parallel, piceous. elytra yellow 

 maculate, legs reddish brown. Antennae rufo-testaceous, club darker. Head 

 piceous, the margins paler, translucent, front faintly trituberculate, surface 

 coarsely punctured, the middle of front smoother : clypeus emarginate at mid- 

 dle, the angles distinct, sides oblique, slightly sinuate, genre moderately i)romi- 

 nent, obtuse. Thorax nearly twice as wide as long, sides nearly parallel, arcuate 

 near the front angles, the hind angles distinct, slightly obtuse, base arcuate, 

 marginal line distinct, disc convex, piceous, the sides brownish, surface with an 

 intermixed punctuation, coarser near the base and sides, moderately closely 

 placed. Elytra a little narrower at base than the thorax, humeri distinct, 

 sparsely dentiform, disc finely striate, the strife not closely punctured, intervals 

 flat, very sparsely indistinctly puncttilate, color yellowish, the side margin and 

 apex slightly reddish, maculate with black spots arranged in a .semi-circle from 

 the ba.se of the fifth interval, another arcuate row of spots on the declivity, a 

 few near the apex and a rather broad lateral stripe. Body beneath indistinctly 

 punctate. Mesosternum coar-sely punctate, not carinate, opaque at middle. An- 

 terior tibiiB smooth in front, tridentate externally and crenate above, the first 

 tarsal joint shorter than the second. Posterior femora sparsely punctulate. the 

 first tarsal joint nearly as long as the next three. Length .1."^ inch ; 4.5 mm. 



Jl/a/e.— Anterior tibial spur long, scarcely more slender to tij) ; ai)ex obtu.se. 



Female. — Sjmr slender, acute, shorter. 



