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



Bahia, Petropolis, Kio de Janeiro, Santa Catharina, Blumenau) and Bolivia (Farinas and. 

 S. Antonia). Length 17-51 mm. 



This appears to be a very common, widely distributed and variable species. Large 

 specimens may be as much as three times as long as small ones, are much more robust- 

 looking, have the sides of the pronotum unpunctured except in the scars and marginal 

 grooves instead of extensively punctured, have the dorsal grooves of the elytra smooth 

 instead of distinctly punctured and have the lateral grooves moderately strongly instead of 

 very coarsely punctured. 1 The mesosternal scars are usually deep, narrow and smooth as 

 in P. unicornis, but may be larger and more irregular, with or without a few hair-bearing 

 punctures, or the whole of the sides of the mesosternum may be densely covered with 

 hair-bearing punctures. The hair on the elytra is usually distributed as in P. opacus, but 

 may be more extensive as in P. unicornis. 



P. interruptus differs from P. opacus in having the surface of the body glossy and the 

 punctures in the grooves of the elytra much less coarse, the lateral ones not being 

 transverse. In these characters it resembles P. unicornis, from which it differs in having a 

 much shorter central tubercle. 



Passalus glaber, n. sp. 



Fig. VII, 23, p. 53. 



One specimen without locality record. Length 37 mm. 



This species is very like the last, but has only a few hair-bearing punctures on the 

 elytra, these being confined to the lower parts of the shoulders immediately in front of the 

 epipleura ; it has the mesosternal scars replaced by broad matt areas which are not sunk 

 below the general level of the plate ; and it has the metasternum somewhat less extensively 

 punctured . 



Passalus binominatus, Percheron. 

 Passalus binominatus, Percheron, 1841, pp. 23-24. 



One specimen from Santa Catharina, 32 mm. long. 



The secondary tubercles on the anterior margin of the head are less widely separated, 

 and although the frontal ridges are lightly arched the frontal area is more nearly triangular 

 than semicircular. The central tubercle is obtuse and has no free forwardly directed apex.. 

 There are no coarse punctures on the general surface of the pronotum. The mesosternal 

 scars are entirely absent. There are only a few coarse punctures on the inner side of the 

 posterior intermediate areas of the metasternum. In all other respects this species resembles 

 P. glaber. 



Passalus erosus, Truqui. 



Fig. VII, 24, p. 53. 

 Passalus erosus, Truqui, 1857, p. 268. 



One specimen doubtfully recorded from Brazil, and one said (doubtless incorrectly) 

 to have come from India. Length 35-36 mm. 



1 The punctures in the lateral grooves are really of about the same size in all specimens ; consequently they are pro- 

 portionally larger and look much coarser in small than in big ones. 



