AMERICAN COMI'ONENTS OF THE TENTYRIIN.-I': 349 



the interstitial punctures similar; abtlunien nnicli less rugulose, 

 minutely, sparsely punctate medially. Female with a deep ab- 

 rupt sinus, about three times as wide as deep at the apex of the 

 last dorsal segment, the male having the same segment evenly 

 but broadly, subangularly rounded at tip throughout the width. 

 Length 6.2-8.0 mm.; width 3.23-3.5 mm. Arizona (near 



Tuc^'son ) peropacus n . sp. 



10 — Elytra elongate, parallel, body deep black, the under surface 

 piceous-black, the legs rufous, the integuments polished ; head 

 rather coarsely, not densely but substrigosely punctate, finely, 

 densely so at apex, the sides only feebly converging but strongly 

 arcuate, becoming parallel toward the eyes, the epistoma feebly 

 sinuate ; prothorax not quite four-fifths wider than long, widest 

 near the base, where the sides are arcuate, becoming strongly 

 converging and nearly straight thence to the sinuate apex, which 

 is about two-thirds as wide as the base, the basal angles obtuse 

 and distinctly rounded, the punctures fine but strong, sparse, with 

 a partial impunctate median line, rather abruptly coarse, dense 

 and longitudinally confluent toward the sides ; basal lobe moder- 

 ate ; scutellum small, a seventh or eighth as wide as an elytral 

 base ; elytra one-half longer than wide, or, in the female, a little 

 less, barely as wide in the basal part of the prothorax, gradually 

 narrowly rounded or subogival toward tip, the sides very feebly 

 arcuate; punctures fine, coarse toward the sides, extremely close- 

 set and crowded in virtually unimpressed series, the interstitial 

 punctures extremely sparse and very minute, confused ; abdo- 

 men minutely, sparsely punctate medially. Length 6.0-7.0 mm. ; 

 width 2.4-2.9 mm. Arizona conicicollis Csy. 



Elytra similarly elongate, the body very elongate-oval, moderately con- 

 vex, blackish-piceous in color, the legs pale rufous, the surface 

 shining though just visibly alutaceous ; head not finely or densely 

 punctate, the punctures separated by nearly twice their own widths 

 on the vertex; prothorax less narrowed anteriorly than in conici- 

 collis^ w4th a similar rather narrow and feeble basal lobe, about 

 two-thirds wider than long, the apex but feebly sinuate and three- 

 fourths as wide as the base, with the angles right and not prom- 

 inent, the sides subevenly and moderately arcuate throughout, 

 becoming subparallel basally, the basal angles right and evidently 

 rounded, the punctures fine and sparse, becoming gradually rather 

 coarse, dense, coalescent and forming long rugae in only about 

 lateral sixth ; scutellum small, about an eighth as wide as an ely- 

 tral base ; elytra fully two-thirds longer than wide, about three 

 times as long as the prothorax but not evidently wider, very gradu- 

 ally acutely ogival in fully posterior two-fifths, the sides very 

 feebly arcuate, the series even, unimpressed and entire, composed 

 of close-set punctures, very fine suturally, somewhat coarse, 

 muricate and almost confluent, with the surface more opaque, 

 laterally, the intervals excessively minutely, sparsely punctulate 

 in very uneven single to double series ; abdomen very minutely, 



