76 NEOTROPICAL PSELAPHIDAE 



2. Lateral pronotal margins with about six sharply defined, acute teeth. . 3 

 Lateral pronotal margins with about six very minute, blunted but 



discrete denticles, of which one may be larger Group V 



3. Tempora with the posterior angles pointed, subdentate. . . .Group II 

 Tempora with the posterior angles rounded, not subdentate 4 



4. Antennae with segments IX and X at least as long as wide, if not 



longer than wide Group III 



Antennae with segments IX and X slightly or distinctly wider than 

 long, e.g. transverse 5 



5. Antennae with segments III to VIII all transverse, wider than long 



Group IV, first section. 



Antennae with segments III to VI having length and width equal, 



and segments VII and VIII slightly transverse 



Group IV, new second section 



The following keys to the species of Eurhexius are offered tentatively 

 with the exception of rugulosus Reitter, which appears to belong in some other 

 aggregate (vide supra) : 



Key to the Group I Species 



Species known from Central America. 1 



Species known from Brazil 4 



1. Basal antennal segment twice as long as second segment; first visible 



tergite twice as long as second ventralis 



(2.5 mm., 3000-4000 ft., Volcan de Chiriqui, Panama) 

 Basal antennal segment not twice the length of second; first two 

 tergites subequally long 2 



2. Antennal segments VII and VIII slightly broader and shorter than 



segments III to VI parvioeps 



(2.12 mm., 8000 ft., Volcan de Chiriqui, Panama) 

 Antennal segments III to VIII of equal length and width, similar. . . 3 



3. Integument polished, pubescence short trimiodes 



(L5 mm., 8500-10500 ft., Totonicapan, Guatemala) 

 Integument not shining, more or less opaque, pubescence dense and 



conspicuous vestitus 



(2.12 mm., 2000-3000 ft., Volcan de Chiriqui, Panama) 



4. Length 1 mm.; long, brown pubescence sexpunctatus 



(Blumenau, Brazil) 



Length 2 mm. ; shorter, sparse pubescence longicornis 



(Blumenau, Brazil) 

 Group II 

 The second group contains but a single species, simoni (Reitter). In this 

 species, described from Sao Paulo, Brazil, at 3000 feet altitude, the length is 

 given at 3.0 millimeters and the pronotum is much more densely punctate than 

 the head or elytra. The acute temporal angle separates it from the rest of 

 the genus. 



