r>8 NORTH AMKinCAN 



very large, emargination small, slightly wider than deep, sides nearly 

 straight, tooth nearly as long as wide, broadly rounded at tip, simple, muth 

 less than one-half as long as the depth of the emargination ; terminal joints 

 of the palpi short, thick, truncate at tip ; third joint of the maxillary rather 

 long and slender, somewhat sparsely setose. Prothorax widest very slightly 

 in advance of the middle, where it is distinctly wider than the head, and one- 

 fourth wider than long; sides strongly arcuate, convergent toward the basal 

 angles, and excessively feebly and broadly sinuate ; basal angles strongly 

 obtuse, very feebly produced at the immediate apex, not rounded ; apical very 

 obtuse, slightly rounded ; base broadly arcuate throughout, about seven- 

 eighths as long as the apex, which is broadly roundly and feebly emarginate 

 throughout; disk moderately convex, polish.'d, and not granulose in the 

 middle, along the sides and base, and especially near the basal angles 

 strongly and finely granulose ; median line narrow and very distinct ; basal 

 depressions strongly impressed, rather distant from the angles, connected by 

 an arcuate feeble impression ; carinae of basal angles rather feeble, sinuate 

 externally, and diverging very slightly from tiie lateral edges, becoming 

 obsolete beyond the basal fourth ; lateral edges and setae as in vernuln. 

 Elytra widest at about the middle, where they are about one-third wider 

 than the pronotum ; sides parallel and rather strongly arcuate for nearly 

 seven-eighths the length from the base ; liumeri not very broadly rounded ; 

 disk four-fifths longer than wide, somewhat acutely rounded behind, fully 

 two-thirds longer than the head and pronotum together, very flat, abruptly 

 declivous at the sides, rather strongly granulose thronghout, narrowly and 

 istinctly striate ; striae punctate, not becoming obsolete posteriorly, sutural 

 very strong throughout, acutely recurved at tip, returning as the second, 

 and, after a short partial interruption, as the eighth ; also, at the point of 

 origin of the eighth, there is a branch which is continued anteriorly as the 

 fifth, and by a very feeble branch as the seventh ; the sixth terminates 

 before reaching this last point of separation at one-sixth the length from the 

 apex ; third and fourth striae mutually recurved and continuous at one- 

 tenth the length from the apex ; punctures very small, round, deeply im- 

 pressed, closely placed in the striae, not closer in the sutural rows ; scutellar 

 row of about nine punctures ; each elytron has at three- tenths and two-tliirds 

 the length from the base a discal puncture, between the second and third 

 striae, and another just beyond and exterior to the point of junction of the 

 third and fourth striae, and adjoining the strongly oblique portion of the 

 fifth stria, much nearer the margin than the apical angle. Legs slender ; 

 posterior tarsi short, slender, first joint as long as the next three together, 

 and slightly shorter than the last. Length 4.0 mm. 



Arizona (Morrison), 3. 



A reniarkable species, very depressed ; readily known by its j>ale 

 unieolorous elytra, peculiar sliort basal joint of the antennae wliieii is 

 enlarjied toward base reminding us of the corresponding joint in 

 Tricliopteryx, and by tlie sculpture of the elytra, more particularly 

 toward the apices. It is also ratiier remarkable from the fact that 

 the first joint of the posterior tarsi is sliorter than the last. 



