98 CASEY 



inner series large and transverse, the external small but uniting with 

 the inner on the subapical segments, those of the last segment very 

 large, extending nearly to the apex but not transversely confluent. 

 Length (9) 16.8 mm.; width 6.8 mm. Montana adonea n. sp. 



Prothorax at base almost as wide as the elytra, the sides almost a prolonga- 

 tion of those of the latter, which are similarly rounded or obtuse at 

 tip, with the sutural angle dentiform; surface shining, greenish to vio- 

 laceous metallic, the anterior thoracic angles pale as usual 19 



19 — Abdomen polished, very finely and sparsely punctate. Body nearly 

 as in adonea; head ( 9 ) sparsely, irregularly punctate, solidly pale 

 between the entire inner margins of the eyes, excepting the small anten- 

 nal sinuses and two large and two minute discal central spots, the trans- 

 verse hind margin of the pale area with a quadrate median emargina- 

 tion; eyes moderate; prothorax evenly trapezoidal, with the sides 

 nearly straight or very faintly biarcuate, the apex rather prominently 

 rounded medially; surface broadly tumid sublaterally except near the 

 apex, coarsely, rather closely and irregularly punctate, with but small and 

 badly defined smooth spots, the median fine impunctate but not tumid, 

 unipunctate basally ; elytra three-fourths longer than, wide, nearly as in 

 adonea but with more evidently unequal intervals; orange spots of the 

 inner and outer abdominal series moderate, generally transversely 

 united, those of the last segment transverse but not meeting medially 

 and each prolonged posteriorly along the margin for a short distance. 

 Length ( 9 ) 1 7.0 mm. ; width 6.9 mm. Utah (Stockton) . . .histrio n. sp. 



Abdomen more closely, more or less strongly and conspicuously punctate 

 though somewhat variably so as usual 20 



20 — Form rather broad, only moderately convex, shining, dull metallic 

 green to violaceous ; head ( 9 ) strongly but not very densely punctate, 

 the back part of the front between the upper part of the eyes less punc- 

 tate and medially feebly impressed, the front surrounded broadly with 

 orange-yellow, which is sometimes solid excepting two median spots; 

 eyes feebly convex, not prominent; prothorax trapezoidal, two-thirds 

 wider than long, the sides broadly, very feebly biarcuate; surface almost 

 evenly convex, rather coarsely but unevenly punctate, with the usual im- 

 punctate areas sublaterally and a smooth median fine, which is frequently 

 striatulate along the middle posteriorly, the fovea subobsolete; elytra 

 evidently less than twice as long as wide, parallel, rather rapidly round- 

 ing and oblique at the sides in apical two-fifths, the apices rounded, 

 becoming transverse suturally, the sutural angle dentiform; surface 

 with the intervals strongly alternating in convexity, sparsely and very 

 inconspicuously punctate throughout, the subhumeral marginal cavity 

 deep; under surface strongly, moderately coarsely and closely punctate, 

 immaculate except the abdomen, where the four series of yellow spots 

 are well developed, the two lateral transversely confluent subapically, 

 the two large spots of the last segment not attaining each other medially. 

 Length (9) 18. 0-19. 5 mm.; width 6.8-7.4 mm. New Mexico (Fort 

 Wingate), Colorado (Salida), Arizona (Grand Canyon of the Colorado) 

 and Idaho (Coeurd'Alene — the color brighter aeneous) . .subornataLec. 



