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



very pronounced, the frontal area more or less rugose but unpunctured, the frontal ridges 

 strongly arched, the inner and outer tubercles nearer together, the anterior ends of the 

 marginal grooves of the pronotum more strongly dilated and punctured, the sides of the 

 pronotum more extensively punctured in small and less in large specimens, the posterior 

 intermediate areas of the metasternum less strongly and extensively punctured, the grooves 

 of the elytra somewhat more strongly punctured, and the shoulders and epipleura 

 punctured and hairy. The spines on the middle tibiae are variable in number ; in none of 

 our specimens are they very strong. 



Passalus interstitialis, Eschscholtz. 



Fig. VII, 13, p. 53. 



Passalus inter stiiialis, Eschscholtz, 1829, pp. 18-19. 



One or more (often numerous) specimens from each of the following localities : — Mexico, 

 Guatemala, Honduras (San Pedro Sula), Panama (Chiriqui), Cuba, Surinam, Peru (Cumbase 

 and Amazon), Brazil (Amazonas, Pernambuco, Bahia, Rio and Blumenau), Bolivia (Cordico 

 and Farinas) and Paraguay. Length 24-34 mm. 



The anterior margin of the head is much more extensively notched in the middle line 

 than in the preceding species, and the notch is bounded by a pair of very prominent 

 tubercles. These tubercles are fully as strong as the outer tubercles, which are somewhat 

 small and are more or less obscured by the inner tubercles, the latter being very long and 

 projecting from a point contiguous to and a little behind and on the outer side of them. 

 From the inner tubercles the imperfectly denticulate frontal ridges extend in a straight 

 line backwards and inwards to meet in a right or slightly obtuse angle. The anterior part 

 of the frontal area is more or less punctured. 



The pronotum resembles that of the preceding species in shape and is more or less 

 extensively punctured at the sides, but the anterior ends of the marginal grooves are not 

 expanded. The mesothorax is normal. The posterior intermediate areas of the 

 metasternum are closely and coarsely punctured ; the lateral areas are moderately broad 

 and are covered with hair-bearing punctures. The dorsal grooves of the elytra are 

 strongly but finely punctured, the lateral grooves are coarsely punctured. The epipleura 

 shoulders and anterior half or two-thirds of the outermost rib of the elytra are thickly 

 covered with hair-bearing punctures. The middle tibiae are armed with one stout spine. 



Passalus glaberrimus, Eschscholtz. 

 Passalus glaberrimus, Eschscholtz, 1829, p. 20. 

 Four specimens, of which three are from Brazil (Blumenau and Rio), and one bears 

 no record. Length 20 mm. 



Passalus glaberrimus is very like P. incertus, but has the anterior margin of the head 

 more definitely notched than is usual in that species, the sides of the pronotum usually 

 more extensively punctured, the anterior angles of the pronotum somewhat more acute 

 and the elytra devoid of hair-bearing punctures. 



