VITTATE CHRYSOMELID BEETLES DISONYCHA — BLAKE 7 



4. Head coarsely punctate and with occipital dark spot; prothorax with two 



dark spots anteriorly, sometimes a short median line (Bolivia, Paraguay, 



Argentina) caustica Harold (p. 75) 



Head not coarsely punctate and without occipital spot; prothorax immaculate 

 (Argentina) suturalis Bryant (p. 74) 



5. Elytra with many pale vittae (Brazil) . . . multivittata, new species (p. 58) 

 Elytra with the usual sutural, median, and often submarginal or marginal 



vittae 6 



6. Head and prothorax coarsely and often rather densely punctate .... 7 

 Head and prothorax not unusually densely or coarsely punctate .... 11 



7. Head pale with dark occipital spot (Bolivia, Paraguay, and Argentina) 



caustica Harold (p. 75) 

 Head entirely dark 8 



8. Small (5-6 mm.), prothorax without spots or band, entirely pale (Argentina, 



Uruguay, Bolivia, Chile, Brazil) argentinensis Jacoby (p. 70) 



Large (7-10 mm.), prothorax spotted or banded 9 



9. Elytra with longitudinal depression from humerus down side (Venezuela, 



Colombia, Canal Zone) venezuelae Jacoby (p. 54) 



Elytra without longitudinal depression down side 10 



10. Fourth antennal joint twice as long as third, elytra very densely punctate 



(Bolivia) cratera, new species (p. 56) 



Fourth antennal joint not twice as long as third, elytra not so densely punctate 

 (Paraguay) aplicata, new species (p. 55) 



11. Elytra with very narrow sutural and median vitta not reaching base (Brazil) 



crassicornis, new species (p. 56) 



Elytra with the usual sutural, median, and submarginal or marginal 



vittae 12 



12. Elytra more or less costate in median vitta, especially in female .... 13 

 Elytra not costate 16 



13. Prothorax with four or five spots 14 



Prothorax without spots 15 



14. Spots on prothorax well defined and dark (Argentina, Chile, Paraguay) 



bicarinata Boheman (p. 12) 

 Spots on prothorax pale and evanescent (Peru) 



yurimaguensis, new species (p. 15) 



15. Elytra rather densely and coarsely punctate (Pard, Brazil) 



varia, new species (p. 14) 

 Elytra not coarsely punctate (southeastern^^Brazil)' 



immaculata, new species (p. 13) 



16. Prothorax entirely pale, without spots or bands 17 



Prothorax more or less spotted or banded 26 



17. Elytra with submarginal dark vitta 18 



Elytra with marginal dark vitta 22 



18. Femora entirely pale 19 



Femora pale with a dark streak or dark apex 21 



19. Median elytral vitta not unusually narrow (Venezuela) 



elongata Jacoby (p. 52) 

 Median elytral vitta very narrow 20 



20. Prothorax rectangular, approximately twice as wide as long with a small 



lateral callosity on each side (Colombia) . colombiana, new species (p. 33) 



Prothorax not rectangular, not twice as wide as long, without lateral callosities 



(Mexico, Central America, Colombia) . quinquelineata (Latreille) (p. 31) 



