12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



6. Thorax nearly as long as wide, rather flat, not densely punctate 



or very densely covered by scales, especially over head (Mexico) . 



melancholicus Jacoby 

 Thorax definitely wider than long, densely punctate and densely 



covered by scales 7 



7. Punctation of thorax not coarse but dense and confluent, a con- 



vexity in middle of thorax 8 



Punctation of thorax coarser and distinct, not very often confluent, 



no pronounced convexity in middle of thorax 9 



S. Punctation of thorax exceedingly fine and in lines, the punctures 



not at all distinct; aedeagus short (southern Texas and New 



Mexico and region south of that in Mexico) cyphus, new species 



Punctation of thorax coarser, but still confluent and of indistinctly 



formed punctures; aedeagus longer (southern Arizona, Sinaloa, 



Mexico) austrinus, new species 



9. Aedeagus tapering at tip ; thorax with elongate punctures, tending 



to be in lines, sometimes confluent (Mexico) carinatus Jacoby 



Aedeagus broadly rounded with a short, broad point 10 



10. Thorax covered evenly by dense, deep, round punctures ( Honduras, 



Guatemala, Nicaragua) femoralis Jacoby 



Thorax with less regular punctation, the punctures becoming 



coarser in basal portion ; aedeagus smaller (Panama) — coenus, new species 



SOUTH AMERICA 



1. Middle tibiae and in male posterior tibiae with a spur before 



apex 2 



Middle tibiae and posterior tibiae without spur before apex 3 



2. Black, elongate, elytra usually more than twice as long as pro- 



thorax (Bolivia) calcariferus, new species 



Deep reddish brown to piceous, elytra usually not more than twice 

 as long as prothorax or even less (Venezuela) spinipes, new species 



3. Clothed with long hairlike scales ; only a faint trace of toothing on 



anterior tibiae (Peru, Chile) immundus Erichson 



Not clothed with long hairlike scales; usually with a tooth on 

 anterior tibiae 4 



4. Apex of elytra with a band of pale scales 5 



Apex of elytra without a band of pale scales 7 



5. Anterior margin of thorax with a pair of gibbosities separated by 



a deep groove ; anterior pair of tibiae not toothed (Brazil) . 



curculionoides Leffevre 

 Anterior margin of thorax thickened but not gibbose ; anterior pair 

 of tibiae toothed 6 



6. Large, 7.5 mm. ; elytra very wrinkled with irregularly shaped, 



often stellate punctures (Cayenne) leucurus, new species 



Smaller, 6 to 7 mm. ; elytra not very wrinkled, with small round 

 punctures (Cayenne) crassimarginatus, new species 



7. Each elytron faintly trivittate ; aedeagus broad, almost truncate 



at apex with a small tip in middle (Trinidad, Brazil) . 



rhabdotus, new species 

 Elytra not trivittate; aedeagus not truncate 8 



8. Large, 8 to 9.5 mm. ; thorax with flattened sides usually imdulate, 



sometimes toothed (Venezuela, Colombia, Bolivia) explanatus Baly 



Smaller; sides of thorax not flattened 9 



