S6 Memoirs oj the Indian Museum. [Vol. VII, 



Ç The anterior angles of the pronotum produced to form a pair 



7 ^ of small but distinctly acute forwardly-directed processes P. latifrons, p. 54. 



C The anterior angles of the pronotum not so produced . . . . . . 8. 



Ç The frontal area small, coarsely and closely punctured in front P. pertyi, p. 54. 



8 -j The frontal area large, smooth or rugose with a few large 



C punctures in front . . . . . . . . P. convexus, p. 55. 



!The elytra fused, their vertical anterior part lightly convex P. quitensis, p. 55. 

 The elytra separate, their vertical anterior part not convex . . . . 10. 



The anterior margin of the head straight between the outer 



tubercles or very faintly notched in the middle ; the lateral 



areas of the metasternum hairy . . . . . . P. affinis, p. 55. 



The anterior margin of the head strongly notched or provided 



with secondary tubercles between the outer tubercles ; or 



the lateral areas of the metasternum hairless . . . . . . . . 11. 



The frontal area about three times as wide as long, broadly 



rounded and not angular behind ; the anterior margin of the 



head straight or lightly convex between the outer tubercles . . . . 12. 



The frontal area about twice as wide as long, or angular 



behind ; the anterior margin of the head usually notched 



or provided with secondary tubercles between the outer 



tubercles . . . . . . . . . . . . . . 16. 



The central tubercle without very long and slender free apex ; 



the frontal ridges strong . . . . . . . . . . 13. 



The central tubercle with long and slender free apex ; the 



frontal ridges weak . . . . . . . . . . . . 15. 



13 



14- 



lb- 



( The epipleura hairy, the apex of the central tubercle more or 



< less free . . . . . . . . . . . . . . 14. 



(. The epipleura hairless ; the apex of the central tubercle not free P. euacadorensis, p. 56. 



The apex of the central tubercle scarcely free, somewhat blunt P. catherinae, p. 55. 



The apex of the central tubercle distinctly free, sharper . . P. recticlypeatus, p. 56. 



The lateral areas of the metasternum hairy .. ..P. curtus, p. 56. 



The lateral areas of the metasternum hairless . . . . P. gracilis, p. 56. 



r The anterior margin of the head convex between the outer 

 jq! tubercles, but without median notch or secondary tubercles. . P. 'prominens, p. 57. 



(_ Not as above . . . . . . . . . . . . . . 17. 



The.clypeus to some extent exposed as a more or less vertical 

 (slightly overhanging) plate between the frons and the 

 j labrum .. .. .. ... ..P. guatemalensis, p. 57. 



The clypeus entirely hidden • . . . . . . . . . 18. 



The lateral areas of the metasternum hairless ; the epipleura 

 jg J hairy throughout; the central tubercle without free apex.. P. incertus, p. 57. 



Not- as above ... .... ... . . . . . . . . 19. 



