294 GEO. H. HORN, M. D. 



Series A. 



Fifth joint of % antenna' notably enlarfied and thickened; species of ratlicr 



robust facies : elytra vittate, except in deiiticornis and Ulkei 2. 



Fiftli joint of % antennsB merely slightly longer and stouter; species of elon- 

 gate, depressed form, without vitta, at most an indistinct posterior spot. 

 Head not distinctly punctate; surface with scarcely any bronze lustre: 

 punctuation of thorax not close; elytra with faint spot posteriorly. 



8. decipieii!^. 

 Head closely punctate ; surface with very evident bronze lustre ; punctua- 

 tion of thorax close ; elyti-a always without spot 9. albiwiiica 



2. — Elytra not vittate. 



Sixth joint of % antenna prolonged beneath in a spine-like process. 



6. <leiitieornis. 

 Sixth joint of % antenna as long as the fourth and cylindrical. 



7. llkei. 



Elytra vittate ; sixth joint % simple 3. 



3. — Elytra with a simple vitta as in Systena 1. lopidiila. 



Elytral vitta more or less dilated or appendiculate at either end and 



sinuous 4. 



4. — Lower angle of fifth antennal joint % distinctly prolonged ; elytral vitta 



very broad 5. I'obiista. 



Lower angle of fifth joint not prolonged 5. 



5. — Elytral vitta at middle as broad as the space between it and the suture: in- 

 curved at base 4. oregoiieiisis. 



Elytral vitta narrow 6. 



6. — Vitta incurved at base, approaching the scutellum 3. viltata. 



Vitta parallel, with suture at its basal half 2. »iinuata. 



Series B. 



Elytra with vitta or s]iots, form more robust 2. 



l^lytra unicolorous. 



Head and thorax bright reddish yellow, elytra bluish green metallic. 



It), picta. 



Head and thorax not very unlike the elytra in color 3 



2.- Each elytron with two oval yellow spots, one humeral, the other subapical. 



11. bipiiwtiilata. 

 Elytra with a sinuous vitta, appendiculate at each extremity 10. I'ailK^Ma. 

 3. —Form very depressed and slender, surface with seneous lustre, elytral punc- 

 tuation equal 15. piisilla. 



Form more robust and convex, surface of elytra decidedly blue 4. 



4. — Punctuation of elytra equal and uniform 14. Ijf'wisiJ. 



Punctuation unequal, the coarser punctures forming strife near base 5. 



."). — Thorax ieneous; hind tibiaj slender 13. ^noJcolliiii. 



Thorax and elytra blue; hind tibise stouter than usual. 



12. 4*lialybeipeiiiii$<>. 



1. P. lopidllla Lee. — Oblong oval, moderately convex, piceous, shining, 

 surface with faint aeneous lustre, each elytron with a narrow, simple, yellow 



