206 NEOTROPICAL PSELAPHIDAE 



2. Elytra humeri spined 3 



Elytra may have prominent humeri, but humeri never spined 4 



3. Antennal segment IX spherical, X spherical; known only from Brazil; 



1.66 mm. long trabeculatus 



Antennal segment IX elongate-oval, X trapezoidal from a dorsal view, 

 asymmetrically transverse from a lateral view with the dorsal face 

 produced dorso-anteriorly ; known only from Colombia; 1.7 mm. 

 long seeversi new species 



4. Integument shining; elytral humeri not prominent; 1.87 mm. long; 



antennal segment IX spherical, X quadrate subcarinatus 



Integument strongly granulate between the eyes ; elytral humeri prom- 

 inently oblong; 1.5 mm. long (smallest species known) . .spiculatus 



5. Pronotum trispinose, a large straight spine on each side anterior of 



the middle, and a single smaller spine at middle of the apical mar- 

 gin; 2.6 mm. long; integument lightly punctulate and polished; 

 humeri of elytra obtusely prominent but not spined; antennal seg- 

 ment VIII briefly ovate, IX transversely trapezoidal, XI conical; 

 male metastemum slightly transverse and depressed; male last 



sternite obtuse and depressed tricuspidatus 



Pronotum bispinose as usual 6 



6. Very large, in excess of three millimeters long; integument entirely and 



cribrately punctate (largest species of the genus) bellicosus 



Smaller, not longer than 2.7 millimeters ; integuments variously shin- 

 ing, lightly granulate to locally strongly alutaceous 7 



7. Elytra humeri spined 8 



Elytra may or may not have prominent humeri but these never spined 11 



8. Integument entirely granulated, the granules small but abundant, semi- 



shining; 2.3 mm. long; antennal segment VIII obconical, IX 



subovate, X subglobular and slightly transverse gallardoi 



Integument of elytra and abdomen semishining to strongly shining; 

 integument of head and pronotum either weakly or locally strongly 

 alutaceous 9 



9. Male with metastemum simply tumid on either side of a median im- 



pression mattogrossoensis new species 



Male with the metastemum on each side of a median impression either 

 subcarinately tumid or tuberculat€ with the tubercular swelling 



carinated 10 



10. Alutaceous punctation of head and pronotum very strong; antennal 

 segment VIII and IX oblong, X transverse ; male metastemum with 

 a strongly compressed, sharply carinated tubercle on each side; male 

 with sixth sternite entirely and circularly excavated with the apical 

 angles extended as the approximate arms of a forceps; 2.5 to 2.7 



mm. long gladiator 



Alutaceous punctation of head and pronotum much weaker, with ely- 

 tra and abdomen shining; antennal segment VIII oblong, IX ovate. 



