8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io4 



21. Median vitta very short, not reaching apical curve, explanate margin wide 



(Brazil) explanata, new species (p. 59) 



Median vitta of usual length, aedeagus with broad arrow-shaped tip (Peril) 



imitans (Jacoby) (p. 61) 



22. Large (8-10 mm.) 23 



Smaller (5-7 mm.) 24 



23. Head entirely dark, outer Joints of antennae pale (upper Amazon) 



nigrofasciata (Jacoby) (p. 60) 

 Head entirely pale, antennae entirely dark, unusually long ("St. Paulo") 



paula, new species (p. 62) 



24. Head entirely pale (Bolivia) manni, new species (p. 47) 



Head with dark occipital spot 25 



25. Eyes large, interocular space less than half width of head (Colombia) 



tridyma, new species (p. 49) 



Eyes not unusually large, interocular space at least half width of head (New 



York to Argentina) glabrata (Fabricius) (p. 43) 



26. Elytra with submarginal dark vitta 27 



Elytra with marginal dark vitta 33 



27. Prothorax with a submarginal dark vitta (Panamd, Colombia, Peru) 



peruana Jacoby (p. 29) 

 Prothorax without a submarginal dark vitta 28 



28. Prothorax with a broad dark median plaga extending from two anterior spots 



to base (Argentina, Paraguay, Brazil, Venezuela) 



plagifera, new species (p. 58) 

 Prothorax without broad median plaga from two anterior spots to base . 29 



29. Large (7-10 mm.) 30 



Smaller (5-6 mm.) 32 



30. Prothorax with Y-shaped median spot and wide explanate margin (Colombia, 



Canal Zone, Costa Rica) panamensis Jacoby (p. 41) 



Prothorax without Y-shaped median spot and not unusually wide explanate 

 margin 31 



31. Elytral vittse reddish brown (upper Amazon) . juruensis, new species (p. 63) 

 Elytral vittae dark piceous, elytra unusually broad (Amazon) 



amplipeniiis, new species (p. 63) 



32. Prothorax with two small spots anteriorly (Paraguay) 



sapucayensis, new species (p. 20) 

 Prothorax with five spots (Venezuela) pittieri, new species (p. 38) 



33. Prothorax with seven small distinct dark spots (Bolivia, Brazil, Argentina) 



septemmaculata, new species (p. 69) 

 Prothorax with less than seven spots or the spots confluent 34 



34. Prothorax with a broad band or confluent or nearly confluent spots . . 35 

 Prothorax with three distinct, well separated spots 37 



35. Large (6.5-7.5 mm.), prothorax either broadly banded or with five large dark 



spots. Abdomen of male with round excavation near tip (Argentina, 



southern Brazil) conjuncta (Germar) (p. 64) 



Smaller (5.5-6.5 mm.), prothorax usually with brownish or piceous clouding 

 or indistinct spotting, no excavation on abdomen of male 36 



36. Prothorax with three very short but broad and nearly confluent spots, body 



beneath pale except the breast and legs (Bolivia) 



triniaculata, new species (p. 67) 



Prothorax with indefinite brownish area sometimes clouding most of pronotum, 



or subsiding to an indefinite median spot, body beneath mostly black (Peni) 



vittipennis Boheman (p. 46) 



