1918.] F. H. (Jravely : Passalidae of the World. 25- 



tubercle and fnmtal ridjios, which may be united and never have a roughened area betweea 

 them, and its inotlioiax which is strongly punctured in and close round the scars. 



Genus OILEUS, Kaup, 1869, p. 3. 

 Incl. Couiger, Zang, 1905 c ; Rimor, Kaup, 187 1 ; Rimoricus, Kuwert, 1897. 

 Type, Passalus rimator, Truqui, 1857, p. 266 (see Arrow, 1907, pp. 447-449.) 

 Species of this genus appear to be much larger than are those of the last, and further 

 have always, so far as is known, a large decumbent central tubercle with free apex, in.stead 

 of a feebly developed one, as well as a linear instead of an expanded clypeus. 



Oileus ridiculus (Kuwert). 

 Fig. IV, 2. 

 Rimoricus ridiculus, Kuwert. 1897, p. 287. 

 Three .specimens from (iuatemala. Length 34-35 nim. 



The lamellae of the antennae are extremely short, being equal to not more than two of 

 the immediately preceding joints in length ; the pronotura is punctured in and around 

 the scars ; the .scutelhim is roughened all over with ob.solete punctures ; the mesosternal 

 scars are hairy ; and the grooves of the elytra are very finely punctured. In one specimen 

 the mesosternum is coarsely punctured. 



Oileus sargi (Kaup). 



liiiiinr s(ir(iii. Kaup. 1871. pp. lll»-12(i. 



One specimen from Guatemala. Length 30 mm. 



The autennal lamellae are very long, being as long as about four of the immediately 

 preceding joints ; the pronotum is unpunctured ; the scutellum is strongly punctured ia 

 the middle : and the mesosternal scars are not hairy. 



Oileus rimator (Truqui). 



Passalus rimator, Trucjui. 18.^7, p. 2t)(j. 

 One specimen from Omilteme, Guerrero, 8,000 ft., lent by the British ^luseum. Length 

 37-8 mm. 



This species is closelv allied to O. sanji. from which it differs in having the cl^iieu-s- 

 lightlv t)i((invex, the anterior margin of the pronotum biconcave and the mesosternal scars- 

 hairy. 



Genus UNDULIFER, Kaup. 1S69, p. 6. 

 Type, Passalus iucisits, Truqui, 1S57, pp. 266-267. 



Undulifer incisus (Tru([ui). 

 Fig. IV. 3. 

 Passalus incisus. Truqui. 18.")". pp. 266-21)7. 

 One specimen from Cordova, Mexico, presented by the British Museum. Length 29 mm, 

 Undulifer incisus is closely related to Oileus ridiculus and sargi. The antennae of the 

 single specimen before me are broken, but from the one remaining lamella I conclude that 



E 



