TYRINI 315 



Group VI contains a single remarkable species, cavicornis Raffray of 

 Guatemala. The species has long, semierect, brown pubescence, is 2.4 mm. 

 long and owes its isolation to the foveoid eleventh antennomere. As stated 

 earlier in the genus treatment, this latter character probably refers to the 

 male sex only and is remarkable in Hamotus where few species have abnormal 

 antennal modifications. 



Group VII contains a single species, rugosus Raffray of Bolivia. This 

 species also has long brown pubescence, is 2 mm. long and owes its isolation 

 to the elytral punctation. The elytral flanks have the integument strongly 

 punctate-granular. 



Key to Species of Groups VIII and IX 



I have reorganized these two groups into one key since the color of 

 pubescence, varying from tawny to deep brown, may prove confusing. 



Palpal sulcus entire, reaching and dividing basal margin 9 



Palpal sulcus not entire, not reaching base 2 



2. Apical spur of posterior tibia long, fine and acuminate 3 



Apical spur of posterior tibia blunt to truncate 4 



3. XI equal to the five preceding segments united; 2.4 mm.; Brazil 



grouvellei 



XI equal to only slightly longer than the three preceding united; 

 Peru brevimarginatus 



4. Ill distinctly longer than wide 5 



III distinctly wider than long, or at most with width and length equal 6 



5. Known only from Mexico; 2.3 mm ursulus 



Known only from Brazil ; 2.3 mm simplex 



6. Known only from Brazil centralis 



Not known south of Panama 7 



7. Pubescence fine in texture, long and abundant 8 



Pubescence stiff, very short and sparse costaricensis new species 



8. Known only from Mexico aztekus new species 



Known only from the Canal Zone castanalus new species 



9. Not known south of Mexico ; 2.6 mm singularis 



Not known north of Panama 10 



10. Ill much longer than wide to slightly longer 11 



III very transverse to width equaling length 13 



11. Known only from Bolivia 12 



Known only from Panama ; 3 mm setipes 



12. Ill, IV, V, and VI much longer than wide; 2.6 mm bicolor 



III slightly longer than wide, IV and V quadrate, VI transverse; 



2.4 mm fauveli 



13. Posterior tibia without tibial spur (?) (Sharp states that his species 



is closely allied to singularis of Reitter. Raffray had difficulty in 

 placing this Sharp species, described on two imperfect specimens 

 without any detail given); 2.5 mm.; brown pubescence; Panama 

 parvipalpis 



