1918.] F. H. Gravely: Passalidae of the World. 45 



mandible slender and scarcely if at all bidentate. The anterior margin of the labrum is 

 straight, the sides all lightly convex. The parietal ridges are somewhat short. The central 

 tubercle is laterally compressed ; its base extends forwards to the point at which the frontal 

 ridges diverge towards the stout conical inner tubercles, from which tubercles they bend 

 abruptly outwards to end in the similar outer tubercles — a character in which this species 

 differs from C. granulum, Kuwert, to which it appears to be more nearly related than to 

 any other species yet described. The transverse course of the ends of the frontal ridges, 

 combined with the more irregular (though glossy) surface of the whole area in front of the 

 inner and outer tubercles combine in some specimens to give this area an appearance 

 of being definitely cut off from the rest of the head, as is the clypeus from the frons in the 

 genus Popilius. The anterior margin of the clypeus is more or less distinctly notched. 



Fig. VI. 

 Passalinse (except Passalus) ; specific characters in the upper surface of the head x 4. 



1. Chondrocephalus quinquecomutus, Gravely. 7. Paxillus brasiliensis (St. Farg. andServ.). 



2. Chondrocephalus cordiger, Gravely. 8. Paxillus pentaphyllus (Beauvois). 



3. Chondrocephalus purulenis (Bates). 9. Paxillus leachii, MacLeay. 



4. Chondrocephalus granulifrons (Bates). 10. Paxillus robustus (Percheron). 



5. V index synelytris, Gra,ve]y. 11. Pax illus crenctus, MacLeay. 



6. Paxillus camerani (Rosmini). 



The angles of the pronotum are rounded, the posterior more so than the anterior. 

 The sides and marginal grooves of the pronotum are coarsely and irregularly punctured ; 

 there are no distinct scars. The scutellum bears a few punctures near the middle. The 

 mesothoracic episterna are glossy throughout, and are coarsely but somewhat sparsely 

 punctured except in the posterior angles, which are smooth. The mesosternum is smooth 

 and glossy, except the lateral margins which are matt. The metasternum is hairless ; its 

 lateral areas are narrow and slightly roughened throughout ; there are a few large punctures 

 on the posterior borders of the intermediate areas. The abdominal sterna are glossy. All 

 the grooves of the elytra are coarsely punctured. The middle and posterior tibiae are 

 armed with about two spines each before the apex. 



Chondrocephalus cordiger, n. sp. 



Fig. VI, 2. 



One specimen from Guatemala, 18-3 mm. long. 



The antennae, mandibles and labrum resemble those of C. quinquecornutus. The 

 parietal ridges are somewhat longer than in that species. The frontal ridges extend straight 

 from the anterior extension of the central tubercle to the small outer tubercles. Not far 

 from the central tubercle they are united by a curved groove, immediately beyond which 

 is a pair of almost obsolete inner tubercles. The somewhat heart-shaped area enclosed 

 between this groove and the frontal ridges is smooth and glossy, like the surface of the 



