TYRINI 313 



9. Median pronotal fovea much smaller than lateral pronotal foveae; 



3 mm. ; Bolivia boUviensis 



Three pronotal foveae subequal in size; 3.5 mm.; Brazil iheringi 



Key to Species of Group II 



IX and X subequal in length and width; XI briefly ovoidal, slightly 

 longer than preceding two united; Blumenau, Brazil. . . .parviceps 



X about one-half longer than IX; XI as long as the three preceding 

 united; Minas Geraes, Brazil subtilis 



Key to Species of Group III 

 Elytral flanks roughly punctate, disc nearly impunctate ; Brazil . . 



inaequalis 



Elytra wholly impunctate 2 



2. IX and X subequal in size, slightly transverse 3 



X one-half wider than IX, very transverse ; 2.5 mm. ; Brazil . . globulifer 



3. XI with parallel sides and rounded apex, as long as preceding four 



united ; 2.6 mm. ; Brazil aubeanus 



XI much wider in apical third, apex obtusely acuminate, not much 

 longer than three preceding united; 2.1 mm.; Brazil. . appendicularis 



Key to Species of Group IV 



This is a large group of nineteen species notable for their bright golden 

 pubescence. The center of the group seems to be the northern rain forests of 

 South Amrica, especially Venezuela and Colombia. This key does not include 

 furcifer and claviger. 



Body dorso-ventrally flattened ; very attenuated anteriorly ; elytra and 

 abdomen with lateral outlines oblique to second tergite ; I unusually 



elongate-cylindrical; 2 mm. ; Brazil deplanatus 



Body of normal convexity and outline ; I of normal proportions 2 



2. Male with posterior tibiae swollen and with the mesial face very 



abnormal, bearing either a large fovea or a prominent truncated 



tubercle 3 



Males and females with tibiae not abnormal at middle of mesial face. . 4 



3. Posterior tibiae with a large, elongate-oval, pubescent fovea at center 



of mesial face; 2.9 mm.; Mexico. (PI. XVII, 8) tibialis 



Posterior tibiae with a conspicuous, drum-shaped tubercle at center 

 of mesial face, the apex of the elevation pubescent; 2.6 mm.; Costa 

 Rica. (PI. XVII, 9) turalbus 



4. Antennae very slender, III-VIII transversely spheroidal; Colombia 



brunneus 



Antennae short and thick 5 



5. VI, VII, VIII abruptly more transverse than III, IV, V 6 



III-VIII all very transverse or very gradually more and more trans- 

 verse 9 



