90 MEMOIRS ON THE COLEOPTERA 



sinuate, the basal angles small and right; elytra subplanate, sub- 

 ovate, posteriorly subacute, with geminate series of punctures, 

 the lateral and basal margins bright brassy-green, the margin more 

 reflexed toward base; humeral carina excessively short, almost 

 wanting; posterior tarsi not at all longer than the tibiae. Length 

 27 mm. Mexico (Sonora), Schott. A single example. 



*viridans Lee. 



A Form very elongate-oval and more depressed than in any of our 

 other species of the genus, black, moderately shining to subopaque 

 or very strongly alutaceous throughout above; margins of the 

 prothorax and elytra as in viridans but bright emerald green, 

 not at all brassy, the broad basal green fascia of the elytra widely 

 interrupted medially; head moderately large, the impressions 

 long, deep, the middle lobe of the labrum prominent and truncate, 

 the mandibles as long as the median line of the head, partially 

 strigose, the left the more strongly and closely strigate, differing 

 but little sexually, the right with a small tooth beyond the large 

 one, which is wholly wanting on the left mandible; prothorax 

 one-half wider than long, much narrower at base than at apex 

 but less so in the female, only very feebly convex, the sides almost 

 evenly rounded, with a small abrupt sinus at the very sharp and 

 right basal angles; base almost transversely truncate, the groove 

 fine; impressions very feeble; elytra elongate, fully one-half 

 longer than wide, oval, moderately acuminate, the reflexed margin 

 rather wide, only feebly concave; surface throughout smooth, 

 without vestige of punctuation; hind tarsi (cf ) very long, much 

 longer than the tibiae, the latter with a moderate brush of hair 

 within, or ( 9 ) much shorter though a little longer than the tibiae. 

 Length (excluding mandibles) 25.5-26.0 mm.; width 9.8-10.2 

 mm. Arizona. Levette collection. Four homogeneous examples. 



ambiens n. subsp. 



Form still narrower and very convex, extremely smooth and polished, 

 with rather narrow purplish side margins; head rather small, nearly 

 as in ambiens throughout, except that the mandibles are shorter 

 and more strongly and almost completely strigose; antennae short 

 in the type, which is apparently female; prothorax only two-fifths 

 wider than long, the sides parallel and rather feebly arcuate in 

 anterior two-thirds, then converging to the very short basal sinus, 

 the angles right and very sharp; lateral groove narrow, not attaining 

 the angles, the basal groove of all the other species wholly wanting; 

 two subbasal impressions rather feeble, the stria strong; elytra 

 elongate-oval, rather acuminate, equal in width to the prothorax, 

 the sides broadly and evenly arcuate; concave margins narrow, 

 broader basally. having the usual row of setigerous punctures; 

 surface convex, very deeply and rapidly declivous at the sides, 

 feebly concave along the suture, extremely smooth and glossy but 

 with widely spaced series of fine and very feeble punctures, the series 

 geminate laterally; humeral carina almost wanting; hind tarsi in 

 the type rather stout, somewhat longer than the tibiae, the legs rather 



