I9I4.] 



F. H. GravEIvY : An Account of the Oriental Passalidae. 



325 



Grooves 5-7 of elytra somewhat variable in width ; the poste- 

 rior part of groove 8 rarely' wider than the anterior part, 

 3 ' never as wide as groove 7 . . 



(^.-.— — - •— c / •• ■■ • •• G. ;«o«<tc«/osHS, pp. 249 &29S. 



Grooves 5-7 of elytra always very broad; the posterior part 

 of groove 8 like them . . . . . . .. G. tridens, pp. 250 & 299. 



It is possible that " Pelopides'.' gyavidus, Kuwert, whose position is uncertain, 

 may belong to this genus. It diiTers from all the species included in the key in having 

 the left outer tubercle more strongly developed than the right. 



Genus Gonatas, Kaup. 

 Only two species of this genus are recorded from the Oriental Region. I have 

 only seen one of them. 



( heit mandible less elongated and more curved ; lamellae of 

 antennae longer and slenderer . . . . .. G. gennari, pp. 250 & joi. 



] Left mandible longer and less curved, lamellae of antennae 



(^shorter and stouter .. .. .. .. G. naviciilatoy, p. ^oi. 



Genus Leptaulax, Kaup. 

 j Depressed surface of two or three outermost grooves of elytra 



dull, the sculpturing somewhat worn-looking 

 I Elytra polished throughout • 

 A more or less distinct polished tubercle formed out of each 

 of the transverse ridges in lateral grooves of elytra 

 No such tubercles present 



Pronotum flatenned, densely punctured laterally, sides practi- 

 cally straight . . 



Pronotum convex; punctured only in marginal groove, in and 

 close round scars, and (usually) in anterior angles; sides dis- 

 tinctly curved . . 



Inner tubercles at most twice as far from one another as from 

 outer tubercles ; puncturing of lateral grooves of elytra some- 

 what variable, but normally transverse to a marked degree in all 

 species ; intermediate areas of metasternum closely punctured, 

 j uupunctured band along outer margin absent or quite narrow 

 ) Inner tubercles at least twice as far from one another as from 

 outer tubercles; puncturing of lateral grooves of elytra not 

 markedly transverse; intermediate areas of metasternum often 

 less closely punctured, and always with an unpunctured band 

 \ along the outer margin 



/Inner and outer tubercles approximately equal, the former at 

 I most twice as far from one another as from the latter 

 ( Inner tubercles much longer than outer, the later almost 

 j obsolete ; the former at least twice as far from one another as 

 (^ from the latter 



L. beccarii, pp. 251 & 302. 

 3- 



L. humerosus, pp. 251 & 302. 

 L. anna, p. 303. 



L. inacassariensis, pp.256 & 305. 



' I have no specimens of L. novaeguineae , L. obtusidens, or L. glabey before me, and cannot be cer- 

 tain that these characters are correctly noted here in their case. 



