BATRISINI 229 



3. Head with three vertexal foveae 4 



Head with either two vertexal foveae and a median carina, or two 



vertexal foveae only ; vertex never with three foveae 5 



4. Head with three vertexal foveae, two between the eyes as usual and a 



smaller median fovea which is circular in outline; intermediate tro- 

 chanters with a small setaform spine; 1.8 mm planijrons 



Head with the usual pair of inter-ocular vertexal foveae and a median 

 oblong fovea; anterior and intermediate trochanters angularly di- 

 lated but not spined; 1.6 mm trifoveolatus 



5. Vertex with a median longitudinal carina between the vertexal foveae 6 

 Vertex simple, with the normal pair of vertexal foveae but no median 



longitudinal carina; trochanters simple; 1.7 mm resectus 



6. Vertexal carina long; intermediate trochanters slightly pubescent; 



tibiae simple; 1.7 mm modestus 



Vertexal carina very short; intermediate trochanters not pubescent; 

 intermediate tibiae with a strong spine; 2 mm edmundi 



7. Abdomen mucronate apically (this acute to subacute contour is caused 



by the last tergite being either obtusely prominent or having a blunt, 

 obtusely prominent apical tubercle which may or may not be visible 



from above) 8 



Abdomen not apically mucronate 9 



8. Vertex without a median fovea or depression of any kind; 2.2 mm 



peruvianus 



Vertex with an obsolete median depression placed posterior to the 



vertexal foveae productus 



Vertex with a large transverse depression which extends from the an- 



tennal tubercles to behind the eyes, with the vertexal foveae within 



this depressed area ; 2.6 mm magnus 



9. First fully visible sternite (second morphological) with a median 



longitudinal carina at base 10 



First fully visible sternite (second morphological) not medianly cari- 

 nate at base 14 



10. Head very transverse, nearly twice as wide as long breviceps 



Head only slightly wider than long or quadrate to elongate 11 



11. Front evenly declivous and without foveae or paired depressions 12 



Front with a pair of obsolete depressions or a pair of deep oblique 



sulciform foveae 13 



12. Known only from Argentina; vertex evenly convex and without a 



median fovea ; 1.5 mm delicatus 



Known only from Peru; vertex trifoveate, with a large deep median 

 fovea in addition to the usual pair of inter-ocular foveae; 1.8 mm. 

 , laevipennis 



13. Front broadly flattened with a pair of obsolete foveaform depressions 



planijrons 



