10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 79 



5. Large (7 mm. to 12 mm.) ; elytra finely and densely pubescent; 



vittae coalescing shortly behind middle. Atlantic seacoast on 



Dacclmris bacharidis (p. 12) 



Smaller (5 mm. to 9 mm.); elytra not densely pubescent; 

 usually on Solidago or other dry-land composite 6 



6. Lateral and sutural elytral vittae usually distinct, with traces 



of median vitta, sometimes coalescing, sometimes evanescent ; 

 pronotum densely and coarsely punctate. Southwestern 



United States geminata (p. 31) 



Lateral and sutural vittae united behind middle ; pronotum with 

 scattered coarse punctures. Southeastern United States. 



virgata var. (p. 16) 



7. Occipital spot small, oblong, not forming a transverse basal 



band or extending broadly down front ; elytra densely pu- 

 bescent, finely punctate canadensis (p. 13) 



Occipital spot either a wide transverse basal band or extending 

 broadly down front 8 



8. Elytral vittne on close examination deep blue or green, although 



appearing black ; body beneath mostly dark. Nova Scotia. 



neoscotiae, new species (p. 17) 

 Elytral vittae always* entirely piceous or black ; body beneath 

 usually pale, often with a narrow dark margin, this occasion- 

 ally widening 9 



9. Scutellum usually with pale tip ; elytra inconspicuously pu- 



bescent, finely punctate lewisii (p. 22) 



Scutellum black ; elytra distinctly pubescent and, except in 



adcla, distinctly and often coarsely punctate 10 



10. Elytra densely pubescent, covering fine punctation. 



adela, new species (p. 14) 

 Elytra not densely pubescent, the coarse sculpture apparent 11 



11. Robust (6 mm. to 9 mm.), coarsely punctate; occipital spot 



usually widely oblong and extending down front ; aedeagus 



broad with short tip (see pi. 1, fig. 4) virgata (p. 15) 



Slenderer (5.5 mm. to 8 mm.), not so coarsely punctate; occip- 

 ital spot a transverse basal band curving down front ; 

 aedeagus gradually narrowed at tip (see pi. 1, fig. 5). 



borealis, new species (p. 16) 



12. Pronotum conspicuously pubescent 13 



Pronotum either entirely glabrous or very inconspicuously and 



sparsely pubescent 15 



13. Abdomen entirely dark except for last segment ; elytra green 



except for pale margin and small basal vitta not reaching 



middle, smaller (4.5 mm. to 6.8 mm.) pilosa, new species (p. 20) 



Abdomen never entirely dark, usually pale with narrow darker 

 margin ; elytra except for pale margin entirely blue or green, 

 or with lateral, sutural, and traces of median vittae; larger 

 (5 mm. to 8 mm.) , 14 



14. Pronotal spots large; pronotum coarsely and densely punctate. 



California sericotrachyla, new species (p. 28) 



Pronotal spots small; pronotum not densely punctate. Rocky 



Mountains and Great Plains attenuata (p. 21) 



15. Pronotum not alutaceous, more or less shining 16 



Pronotum distinctly alutaceous 24 



