1918.] 



F. H. Gravely : Passalidae of the World. 



119 



10 



11 



12- 



f The frontal ridges ending in the inner marginal tubercles ; 

 insects always unicolorous above 

 The frontal ridges extending parallel to the anterior margin 

 of the head to a point between the inner and outer marginal 

 tubercles, where they end somewhat abruptly ; the anterior 

 parts of the elytra commonly reddish brown in otherwise 

 black insects 

 Large insects (over 28 mm. long) ; the puncturing of the 



pronotum and metasternum very scanty 

 Smaller insects (not more than 25 mm. long) ; the puncturing 



of the pronotum and metasternum much denser 

 The parietal ridges united with the supraorbital ridges ; the 



central area of the metasternum unpunctured 

 The parietal ridges ending more or less abruptly about half 

 way to the supraorbital ridges ; or, the central area of the 

 metasternum punctured 

 The central area of the metasternum almost invariably with 

 at least a few more or less irregularly placed punctures ; the 

 parietal ridges variable 

 The central area of the metasternum with at most one pair of 

 symmetrically placed punctures ; the parietal ridges always 

 ending more or less abruptly about half way to the 

 supra -orbital ridges 

 f The pronotum strongly rectangular ; its anterior angles more or 

 less extensively punctured 

 The pronotum more rounded ; its anterior angles unpunctured, 

 except in small specimens, where a small group may be 

 present 

 The grooves of the elytra not tuberculate 



A more or less distinct polished tubercle formed out of each 

 of the transverse ridges in the lateral grooves of the elytra . . 

 f The pronotum convex, punctured only in the scars and 

 marginal grooves and usually in the anterior angles ; the 

 elytra short, dilated behind ; the metasternum hairy 

 laterally and in front, its lateral and intermediate areas 

 often united 



The pronotum somewhat flattened, densely punctured laterally, 

 its sides practically straight ; the elytra slender, more or less 

 parallel sided ; the metasternum hairless, the intermediate 

 and lateral areas alwavs distinct 



L. roepstorfi, Kuwert. 



L. glaber, p. 113. 



L. barbicauda, p. 114. 

 L. bicolor, p. 111. 



L. anibarbis, p. 116. 



L. cyclotaenius, p. 116. 



L. dentatus, p. 116. 

 L. timoriensis, p. 117. 



• • • • 



L. beccarii, Kuwert. 



9. 



10. 



12. 



L. anna, p. 117. 



L. humerosus, p. 118. 



ZOOGEOGRAPHICAL RESULTS. 



It would be useless to attempt to give here a detailed account of the distribution of the 

 various species of Passalidae. For in the case of Oiiental genera the information gathered 

 together in my " Account of the Oriental Passalidae " can readily be supplemented by the 



