PTEROSTICHIN/E 345 



fine incised line; sides arcuate, diverging and straight from the deep 

 constriction to the hind angles, which are less than right; surface 

 with some ruguliform lines, the anterior impression distinct and an- 

 gulate behind the flat margin, the posterior rather deep transversely 

 between the foveae, which are very deep, the sharply lineate bottom 

 outwardly curved basally, returning along the basal part of the sides, 

 where there is a feeble carina defined thereby; elytra almost one-half 

 longer than \vide, about a fourth wider than the prothorax, oblong- 

 oval, the sides very moderately arcuate, the humeri pronounced; 

 subapical sinus broad but very evident; striae deeply impressed, the 

 seventh notably feeble, the scutellar extremely short; punctures not 

 fine, deep, rather widely but irregularly spaced; intervals broadly 

 convex except laterally; dorsal puncture at three-fifths. Length 

 (9 ) !3-3 mm.; width 4.7 mm. Arizona (southern). . .pimalis n. sp. 



Body smaller and more slender, black when mature and shining; head 

 large, not quite three-fourths as wide as the prothorax, not elongate; 

 eyes moderate, not very convex, the sulci and antennae somewhat 

 as in the preceding; prothorax fully two-fifths wider than long, the 

 sides less evenly rounded, more rapidly converging behind the middle, 

 similarly constricted, with the basal slightly diverging part about an 

 eighth the total length; apex feebly sinuate, the margination com- 

 plete but feebly defined; anterior and posterior transverse impres- 

 sions both distinct, the former subangulate but rather obtusely im- 

 pressed; foveae and carina nearly as in pimalis; elytra three-fifths 

 longer than wide, only very slightly wider than the prothorax, the 

 sides evenly and broadly arcuate; striae rather deeply impressed, 

 the outer but slightly less so and equally punctate, the punctures 

 very distinct, moderately separated; intervals broadly convex; scu- 

 tellar stria wanting; subapical sinus shallow but obvious. Length 

 (9) 12.4 mm.; width 4.2 mm. Kansas. Headwaters of Arkansas 

 River Say. [Molops lixa Lee.] constricta Say 



9 Form a little stouter than the two following, rather less convex than 

 usual, black, the elytra opaque in the female; legs piceous-black; 

 head not elongate and with the neck short, five-sevenths as wide as 

 the prothorax; eyes well developed and rather convex, the sulci 

 parallel; antennae as usual, piceous in color; prothorax two-fifths 

 wider than long, the sides very evenly rounded from apex to the 

 constriction, thence parallel for a seventh the total length, the angles 

 right but rather blunt; apex feebly sinuate, the border flat and with 

 the defining line fine though entire; median stria deep, broadly im- 

 pressed; surface without transverse impressions, the foveae very def- 

 initely bilineate, the inner sulcus curving forward from the basal 

 recurvature and deep, defining a distinct cariniform elevation; ely- 

 tra nearly one-half longer than wide, oblong-oval, barely a fifth 

 wider than the prothorax, the subapical sinus almost obsolete, sub- 

 rectilinear; striae coarse and deep, the sixth feebler and the seventh 

 very fine, the punctures strong and rather close-set; scutellar stria 

 extremely short; intervals but very feebly convex; each elytron in 

 the type has a dorsal puncture just before and another just behind 

 the middle of the length -probably an adventitious character. 



