ART. 2 REVISIOlSr OF TBIRHABDA NORTH OF MEXICO BLAKE 11 



16. Pronotal spots entirely without metallic luster, usually small 



or moderate sized , 17 



Pronotal spots with metallic luster, usually large 21 



17. Sutural vitta entirely absent or at most represented only by 



darkened sutural edges, lateral vitta often reduced to an 



elongate humeral spot. Southern California eriodictyonis (p. 24) 



Lateral and sutural vittae well marked, sometimes a median 

 vitta, sometimes elytra entirely dark except for pale margin 18 



18. Pronotum very smooth, not depressed, polished ; spots usually 



small; elytra never with median vitta or entirely dark_nitidicollis (p. 23) 

 Pronotum somewhat depressed, not so shining; spots usually 

 moderate-sized ; elytra either with median vitta or entirely 

 dark except for margin 19 



19. Elytra with long, dense, silky pubescence covering the puncta- 



tion, sometimes entirely blue or green except for margin, 



sometimes vittate with median vitta confusa, new species (p. 27) 



Elytra with sparser, shorter pubescence, the punctation dis- 

 tinctly visible 20 



20. Occipital spot black, narrowly oblong down front; elytra usu- 



ally with short median vitta, never entirely dark, punctation 



fine diducta (p. 25) 



Occipital spot with metallic luster, curving broadly over head, 

 often forming transverse basal band ; elytra entirely blue or 

 green except for margin and rather coarsely punctate. 



flavolimbata (p. 29) 



21. Very brilliantly metallic, with broad sliining blue or green oc- 



cipital basal band, and large, often contingent, lustrous pro- 

 notal spots; elytra inconspicuously pubescent and coarsely 



punctate, shining blue or green except for margin labrata (p. 28) 



Metallic luster more or less obscured by pubescence, the occip- 

 ital baud and pronotal spots not so lustrous nor usually so 

 large ; elytra distinctly pubescent and with finer punctation 22 



22. Oblong oval, elytra rather coarsely punctate, never vittate, 



pubescence not long and silky (5 mm. to 8 ram.). About 



San Francisco flavolimbata (p. 29) 



Parallel (7 mm. to 10.5 mm.) ; elytra with long silky pubes- 

 cence, sometimes vittate. Southern California and inland 23 



23. Large (8.5 mm. to 10.5 mm.) ; abdomen mostly dark with metal- 



lic luster, prothorax much depressed, its large spots with dis- 

 tinct metallic luster. Along seacoast, southern California. 



luteoclncta (p 26) 

 Smaller (7 mm. to 8.5 mm.) ; abdomen pale, sometimes with 

 margin dark metallic; prothorax with smaller spots with 

 indistinct metallic luster. Along seacoast, southern Cali- 

 fornia and inland, extending to Oregon line__ confusa, new species (p. 27) 



24. Elytra finely and inconspicuously punctate; body beneath 



never entirely dark; scutellum often with pale tip 25 



Elytra rather coarsely punctate ; body beneath usually more or 

 less darkened (not in borealis var. indigoptcra) ; scutellum 

 always dark , 26 



25. Elytra inconspicuously pubescent ; pronotal spots moderately 



large; lateral and sutural vittae usually distinct and united 



at apex, occasionally coalescing before apex lewisii (p. 22) 



