218 NEOTROPICAL PSELAPHIDAE 



Group II 



This second group holds a single species, dichrous, known from a single 

 male from Blumenau, Brazil. 



Key to the Species of Group III 



Six stemites fully visible (Males) 2 



Five stemites fully visible (Females) 13 



2. Antennal segment I very abnormal with the mesio-apical angle 



strongly produced 3 



Antennal segment I simple, not as above 4 



3. Antennal segment I with the mesio-apical angle produced into a long, 



flattened tooth with obtuse summit; dorsal surface of head simple, 

 square, slightly convex through vertex with two pair of foveae, an 

 anterior oblong pair and a posterior punctiform pair; 1.7 mm. 



bubalus 



Antennal segment I obtrapezoidal, wider than the eleventh segment, 

 longer than second and third united, with the mesio-apical angle 

 produced into a short, subconical, subacute extension; dorsal sur- 

 face of head strongly transversely excavated and toothed as de- 

 scribed below; 1.6 mm. long sabomba new species 



4. Antennae with the intermediate segments articulated to form an arc. . 5 

 Antennae with the intermediate segments not forming an arc 10 



5. Arc confined to antennal segments III, IV, and V, with the fifth seg- 



ment with the ventro-apical face produced and projecting ventro- 



apically ; 1.8 mm truncaticeps 



Arc confined to antennal segments distal to III 6 



6. Arc confined to antennal segments IV, V, VI, VII and VIII; VI and 



VII slightly longer than wide with squamous pubescence on ventral 

 faces; VIII slightly transverse with the apical angle acute; 1.7 

 mm curvicornis 



7. Arc beginning with segment V and ending with VII or VIII 8 



Arc extending from segment V to segment IX, all of these segments of 



normal shape; posterior trochanters enlarged with the posterior face 

 concave, the concavity densely pubescent; 1.6 mm. scaphiger 



8. Antennal segment V not much larger than IV; 1.8 mm simplicior 



Antennal segment V much larger than IV 9 



9. Segment V cylindrical-ovate, much wider than IV or VI ; VI elongate, 



very slender, slightly arcuate; VII arcuate-triangular with apical 

 face wide, truncate and the latero-apical angle produced; 1.9 mm. 



pedestrianus 



Segment V strongly dilated toward the base; VI and VII thick and 

 less than twice as long as wide, the seventh segment not arcuate- 

 triangular and the apical-external angle not produced; 1.6 mm. 

 geniculatus 



