1918.] 



F. H. Gravely : Passalidae of the World. 



67 



19/ 



20 < 



21 



22< 



23' 



''The inner tubercles large, directed forwards above the 

 somewhat smaller outer tubercles, close behind the outer 

 side of which they are situated ; a pair of well developed 

 and somewhat widely separated secondary tubercles present 

 between the outer tubercles ; the frontal ridges straight, 

 meeting in a right or slightly obtuse angle ; the lateral areas 

 of the metasternum, and the epipleura, shoulders and 

 anterior parts of the sides of the elytra densely hairy 

 Not as above 



The central tubercle small, without free apex, normal ; the 

 anterior margin of the head not thickened ; the lateral areas 

 of the metasternum hairless 

 Not as above 

 The middle and hind tibiae armed with at most one srmill 



spine 

 The middle and hind tibiae more extensively armed 

 The pronotum punctured only in the marginal grooves and 



in and immediately above the scars 

 The sides of the pronotum with an extensive band of 



punctures above the scars 

 The grooves of the elytra somewhat finely punctured 

 Th.3 grooves of the elytra very coarsely punctured 

 The inner and outer tubercles clearly separate ; the former 

 never more distant from one another than the latter, 

 sometimes more or less obsolete 

 24^ The inner and outer tubercles situated close together, forming- 

 together a pair of small oblique ridges on the anterior 

 margin of the head, with the former tubercles somewhat 

 more distant from one another than the latter 

 ( The epipleura hairless, or the central tubercle with free apex 

 25 < The epipleura densely hairy ; the central tubercle without 

 (_ free apex 

 The central tubercle without free apex, normal 

 The central tubercle with free apex, or more or less columnar 

 The lateral areas of the metasternum hairy ; a more or less 

 rudimentary fourth lamella often recognizable on the 

 antennae 

 f The lateral areas of the metasternum hairless 



i The frontal area fully twice as broad as long ; the central 

 \ tubercle decumbent throughout, with long slender free apex ; 



28 1 the lateral areas of the metasternum hairless . . 



/ The frontal area less than twice as broad as long ; the lateral 



V areas of the metasternum more or less hairy . . 



C The central tubercle strongly elevated at base, massive, with 



29 < small decumbent forwardly directed free apex . . 



(_ The central tubercle not having this form . . 



26 



27 



P. inter stitialis, p. 58. 



P. glaherrimus, p. 58. 



20. 



21. 



24, 



22. 



P. 



spinosus, 



P 



59. 



p. 



spinipes, 



P- 



59. 



p. 



spiniger, 



P- 



59. 



23. 



25. 



P. polli, p. 62. 



31. 



26. 



27. 



28. 



P. abortivus, p. 60. 

 P. jansoni, p. 60. 



P. mucronalus, p. 60. 



P. quadricollis, p. 61. 



29. 



30. 



k2 



