114 AMERICAN COLEOPTERA. 



a character which excludes it from the group to which tliose species 

 belong. 



It occurs in Arizona, and also in Mexico. 



98. O. aratum Lee. — Form slightly elongate, convex ; color nigro-aeneous, 

 shining, the elytra with a small, reddish yellow submarginal spot about one-third 

 from apex, and rarely with traces of a transverse fascia, of the same color, about 

 one-third from base. Head not alutaceous, as wide as the thorax at apex: palpi 

 piceous; antennae about one-half the length of the body, piceous, the first joint 

 slightly paler. Prothorax subcordate, slightly wider than long, narrower at base 

 than apex, more or less finely rugose at base ; apex truncate ; median line fine, 

 abbreviated before and behind ; transverse impressions moderately distinct, espe- 

 cially the posterior, the anterior sometimes feebly marked ; basal impressions small, 

 deep, unistriate ; sides with the margin very narrowly retiexed, arcuate, sinuate in 

 front of the hind angles, which are rectangular and carinate. Elytra about one- 

 half wider than the thorax, oblong-ovate, moderately deeply striate, more finely 

 behind the middle ; striae distinctly punctate nearly to apex, the first, second and 

 seventh entire, the latter grooved at tip; intervals nearly flat, the third with the 

 first dorsal puncture about one-third from base, the second about one-third from 

 apex. Beneath black, shining. Legs nearly black. Length .16.17 inch; 4-4.25 mm. 



At first sight this species recalls grapii and certain members of the 

 tistidatum group, in which it was formerly placed. The dorsal punc- 

 tures are, however, distinctly on the third interval. It ssems most 

 nearly related to scintillans and dysehirinum, both of which have 

 also heretofore been placed in the last-named group. 



But four specimens are known to me, all from Arizona. 



99. B. morulum Lee. — Form moderately robust, convex; color black, 

 slightly aeneous, shining. Head as wide as the thorax at apex; palpi piceous; 

 antennae about one-half as long as the body, nearly black, the first joint more or 

 less rufous beneath. Prothorax subquadrate. about one-half wider than long, 

 narrower at base than apex; apex nearly truncate; median line fine, abbreviated 

 before and behind ; transverse impressions distinct; basal impressions short, deep, 

 bistriate; sides with the margin very narrowly reflexed, moderately arcuate in 

 front, oblique behind ; hind angles obtuse, but not rounded, carinate, the carina 

 short. Elytra slightly wider than the thorax, oblong-oval, moderately finely 

 striate, more finely towards the sides and apex ; striae distinctly punctate to be- 

 hind the middle, the first, second and fifth entire, the latter slightly grooved at 

 tip, the others abbreviated behind ; intervals convex, the third with the first 

 dorsal puncture about one-third from base, the second about one-third from apex. 

 Beneath black, shining. Legs piceous. Length .11-. 13 inch ; 2.75-3.25 mm. 



The above description was taken from the two specimens in the 

 collection of Mr. Henry Ulke. 



At first sight this species recalls members of the eoneolor group, 

 from which, however, it is excluded by the position of the dorsal 

 punctures. It seems, on the whole, best associated with dysehirinum 

 and vile, from which it may readily be recognized by the subquadrate 

 thorax with the hind ang-les obtuse. 



