226 NEOTROPICAL PSELAPHIDAE 



Head with a slender carina on the anterior part of the vertex; front 

 with two circular, sharply delimited foveae sus 



16. Posterior frontal area with a small, median tubercle; antennal tu- 



bercles rounded, not prominent edithae 



Anterior frontal area with a small, median tubercle; anterior tubercles 

 strongly formed and more pointed; 2 mm patruelis 



17. Vertex with a median fossa 18 



Vertex without a median fossa ; front lacking a transverse frontal im- 

 pression; head with four foveae, the posterior pair being placed be- 

 tween the eyes; a small rugose and squamously pubescent patch on 

 each antennal tubercle vividus 



18. Head very strongly transverse vulneratus 



Head only slightly wider than long, or quadrate 19 



19. Vertexal fossa round, and either very shallow or deep 20 



Vertexal fossa oblong, very deep cornutus 



20. Vertexal fossa deep and well-formed armatellus 



Vertexal fossa wide but very superficial, being in reality a shallow 



depression aubei 



Key to the Species of Group VII 



Six sternites fully visible (Males) 2 



Five sternites fully visible (Females) 16 



2. Clypeus (epistoma) abnormal 3 



Clypeus (epistoma) normally formed but the front having a median 



tubercle; this frontal tubercle separated from the inter- antennal 

 frontal margin by a transverse depression so that the obtusely 

 pointed and slightly suberect tubercle appears to be a part of the 

 clypeus proper carinatus 



3. Head very transverse, with dilated and externally auriculated antennal 



tubercles, these tubercles expanded laterally beyond the eyes so that 

 the head is widest through the antennal bases; vertex with a deep, 

 sharply formed and regularly trapezoidal excavation between the 

 eyes; intermediate trochanters simple but intermediate tibiae with 

 a very strong spine; metasternum flat, with a nearly entire sulcus; 



2.4 mm auriculatus 



Head only slightly wider than long, or quadrate 4 



4. Vertex concave 5 



Vertex either simply convex or prominently elevated but not concave 6 



5. Head between the eyes concave for nearly the entire head width, with 



a small tubercle each side between the eyes ; intermediate trochanters 

 armed medianly with a small tubercle; intermediate tibiae with a 



long spine ; 2.2-2.5 mm boliviensis 



Head with a median elongate-triangular shallow concavity ; trochan- 

 ters simple; intermediate tibiae with a strong spine germaini 



