54 Memoirs of the Indian Museum. [Vol. VII, 



the lateral areas are hairy and punctured, as are also the epipleura and the shoulders and 



anterior half of the lower margin of the elytra. In other respects this species resembles 



the preceding one. 



Passalus morio, Percheron. 



Fig. VII, 4, p. 53. 



Passalus morio, Percheron, 1835, pp. 83-84, pi. vi, fig. 4. 



Sixteen specimens from Brazil (Espirito-Santo, Bahia, Blumenau, Rio). Length 

 10-27-5 mm - 



This species is somewhat more convex than either of the two preceding. The length 

 of the antennal lamellae is somewhat variable. 



The head is very like that of P. rhodocanthopoides, but the outer tubercles are very 

 obtuse, the anterior margin is somewhat thickened, the frontal area behind this thickening 

 is flat with no special depression between the inner and outer tubercles, and the inner 

 tubercles are situated much nearer together than the outer. The punctures on the 

 pronotum are usually confined to the scars and marginal grooves, but may be absent from 

 the former or may extend beyond them. The mesosternal scars are represented only by 

 triangular matt areas which are not sunk below the level of the surrounding surface. The 

 posterior intermediate areas of the metasternum are as a rule strongly punctured ; the 

 lateral areas are more or less linear, smooth or slightly roughened, with or without 

 hair-bearing punctures. The epipleura are hairless and unpunctured, the puncturing of the 

 elytra in this and other respects resembling that of P. functato-striatus. The armature 

 of the middle and hind tibiae is variable, never as strong as in P. rugosus. 



Passalus latiîrons, Percheron. 

 Fig. VII, 5, p. 53. 

 Passalus latifrons, Percheron, 1841, pp. 32-33, pi. lxxix, fig. 1. 



Three specimens from Surinam, length 30-6-32-1 mm. 



P. latifrons is very like P. morio, and will perhaps prove to be no more than a local race 

 of it. The outer tubercles are more prominent and consequently less obtuse ; the inner 

 tubercles are less distinct ; the frontal ridges diverge at a more obtuse angle and extend 

 more distinctly beyond the latter towards the former. The anterior angles of the pronotum 

 are produced forwards to form a somewhat obscure but distinctly acute projection. The 

 punctures in the pronotal scars and on the posterior intermediate areas of the metasternum 

 are few in number in all our specimens, and the lateral areas of the metasternum are smooth 

 and hairless. The mesosternal scars are entirely absent. 



Passalus pertyi (Kaup). 

 Fig. VII, 6, p. 53. 



Pertinax pertyi, Kaup, 1869, p. 22. 



Two specimens without locality labels. Length 39-0-41-5 mm. 



The frontal area is smaller in all directions than in P. latifrons and more densely 

 punctured in front. The inner tubercles are obsolete and the frontal ridges do not reach 

 the outer tubercles. The anterior angles of the pronotum are strongly rounded. The 



