VITTATE CHRYSOMELID BEETLES DISONYCHA — BLAKE 5 



10. Small (5-6 mm.); prothorax with wide dark fascia; head dark (United States, 



Honduras) pcnsylvanica (lUiger) (p. 9) 



Larger (5.6-8 mm.); prothorax spotted; head not entirely dark .... 11 



11. Elytra with median dark vitta wider than pale vitta (United States, Mexico) 



procera Casey (p. 10) 

 Elytra with median dark vitta not wider than pale vitta 12 



12. Aedeagus with broad tip not at all acute above (United States, Mexico, 



Guatemala) pluriligata (LeConte) (p. 16) 



Aedeagus with acute tip above (Mexico) teapensis Blake (p. 18) 



13. Elytra with only sutural and median vittae and no marginal or submarginal 



vitta 14 



Elytra with sutural, median and marginal or submarginal vittae ... 18 



14. Median and sutural vittae very narrow and faint (typically colored specimens 



nonvittate) (Florida Keys, Mexico) antennata Jacoby (p. 28) 



Median and sutural vittae normally colored 15 



15. Prothorax with a submarginal vitta on each side and two spots anteriorly 



with a median line and two faint lateral spots (?Costa Rica, Panamd, 



Colombia, Peru) peruana Jacoby (p. 29) 



Prothorax without submarginal vitta 16 



16. Prothorax with two small dark spots, sometimes a faint trace of submarginal 



vitta at apex of elytra (New Mexico, Arizona, Texas, Mexico) 



tenuicornis Horn (p. 25) 

 Prothorax immaculate 17 



17. Elytral vittae unusually narrow (Mexico, Central America) 



niilitaris Jacoby (p. 27) 

 Elytral vittae not unusually narrow (United States, Mexico, Guatemala) 



leptolineata var. texana Schaeffer (p. 27) 



18. Elytra with dark marginal vitta 19 



Elytra with dark submarginal vitta 25 



19. Prothorax unspotted 20 



Prothorax spotted 23 



20. Eyes unusually large, interocular space less than half width of head . . 21 

 Eyes not unusually large, interocular space half or more width of head . 22 



21. Elytra distinctly punctate, occipital spot extending down front in a point 



(near Brownsville, Texas; Sinaloa, Mexico) .... barberi Blake (p. 48) 



Elytra very faintly punctate, head dark about eyes and over occiput down 



to tubercles (Panamd) didyma new species (p. 49) 



22. Head and prothorax coarsely punctate (California, Nevada, Mexico) 



niaritima Mannerheim (p. 71) 

 Head and prothorax smooth and not coarsely punctate 



glabrata (Fabricius) (p. 43) 



23. Head entirely dark (Panamd, Colombia, Venezuela) 



venezuelae Jacoby (p. 54) 

 Head not entirely dark 24 



24. Prothorax with submarginal vitta on each side and 5 spots (?Costa Rica, 



Panamd, Colombia, Peru) peruana Jacoby (p. 29) 



Prothorax without submarginal vitta and usually only one median elongate 

 spot, sometimes a lateral spot on each side (New York to Argentina) 



glabrata (Fabricius) (p. 43) 



25. Prothorax unspotted , 26 



Prothorax spotted 32 



