158 MEMOIRS ON THE COLEOPTERA 



three-fifths longer than wide, but very slightly wider than the pro- 

 thorax and not quite three times as long, obtusely rounded at apex, 

 the apical sinus very feeble; striae rather fine but deep, the scutellar 

 long but fine, the three series of punctures distinct, the foveae of the 

 lateral line broadly interrupted as usual; intervals not quite flat; 

 legs moderate, the basal joint of the hind tarsi evidently longer than 

 the next two; middle tibiae (cf) only feebly arcuate and with the 

 inner serratures fine. Length (d" 9 ) 7.2-9.0 mm.; width 2.5-3.3 

 mm. Texas (El Paso the type locality), New Mexico (Las Vegas) 

 and Arizona. Abundant. [HarpaliisimpoteiisLec.]. . impotens Lee. 



Prothorax always less transverse, often but very little wider than long. . 2 



2 Sides of the prothorax behind the middle feebly converging and 

 straight to the moderately rounded basal angles. Color deep and 

 shining black above, the under surface, legs and antennae dark 

 rufous; surface convex; head short, fully two-thirds as wide as the 

 prothorax, the eyes well developed and prominent; antennae slender, 

 moderate in length; prothorax two-fifths wider than long, the sides 

 rounded anteriorly; base finely and deeply margined, transverse 

 medially, rounded laterally; surface very narrowly and feebly 

 subexplanate at the sides basally, the foveae feeble and slightly 

 punctured, the median stria very fine, almost obsolescent; elytra 

 barely wider than the prothorax and two and one-half times as 

 long, throughout nearly as in the preceding, except that the striae 

 are deeper, especially toward apex, and the intervals more convex, 

 the scutellar stria longer and deeper, the apex less obtuse suturally, 

 the sinus a little more evident; tarsi very slender, the basal joint of 

 the posterior almost as long as the next three. Length ( 9 ) 7.8 mm. ; 

 width 3.0 mm. Arizona (probably southern). . .obsidianus n. sp. 



Sides of the prothorax parallel and broadly, subevenly arcuate through- 

 out 3 



3 Body obscure rufous in color, paler beneath, the legs and antennae 

 still paler, ferruginous, the elytra black, with strong violet-blue 

 lustre, shining; upper surface less convex than usual. Head small, 

 barely half as wide as the prothorax, the eyes prominent, the an- 

 tennae slender, extending slightly behind the thoracic base; prothorax 

 barely two-fifths wider than long, the parallel sides strongly arcuate, 

 the basal angles broadly, the apical rather narrowly, rounded; basal 

 margin very fine, the base just visibly and broadly sinuate laterally; 

 surface broadly concave and evidently punctate latero-basally, 

 somewhat reflexed basally at the sides, the fine median stria evident; 

 elytra rather short, barely one-half longer than wide, less than two 

 and one-half times as long as the prothorax and slightly wider, 

 parallel, very obtusely rounded at tip, the sinus barely traceable ; striae 

 rather strong and deep, the scutellar long, moderately deep, the 

 intervals slightly convex, the setigerous punctures of the three 

 series very fine; middle tibiae (cf ) but feebly arcuate, the graniform 

 inner serrules distinct, rather close-set; tarsi slender, the basal joint 

 of the posterior almost as long as the next three. Length (cf) 

 8.0 mm.; width 3.2 mm. Utah (Virgin River) amcenus Lee. 



Body uniform in color above and generally deep black 4 



