1918.] F. H. Gravely : PassaUdae of the World. 59 



Passalus spinosus (Kuwert). 



Rhodocanthopus incertus, Kuwert, 1898, p. 140. 



Two specimens from Chiriqui, Panama, 20-3 mm. long. A somewhat more robust 

 insect than the preceding. 



The frontal ridges are straight and meet in a right angle ; the inner tubercles are situated 

 about half way from the central to the outer tubercles and there is a pair of small secondary 

 tubercles between them and the latter ; the anterior margin of the head is broadly notched 

 in the middle ; the anterior part of the frontal area is moderately strongly punctured. The 

 pronotum resembles that of P. incertus in shape, but is only punctured in and close to the 

 scars and in the marginal grooves, whose anterior ends are smaller. The mesothorax 

 resembles that of P. incertus. The metasternum differs from that of P. incertus only in 

 having the lateral areas somewhat broader and less smooth behind. The elytra are 

 hairless ; their four dorsal grooves are about as strongly punctured as in P. incertus ; the 

 next four are marked with very large transverse punctures, the transverse ridges between 

 which tend to become obsolete behind. In the two remaining grooves these ridges 

 are obsolete throughout, and at the extreme posterior end the longitudinal ridges become 

 obsolete also, the remaining surface being matt. The middle and hind tibiae are armed 

 with three or four strong spines. 



Passalus spinipes, n. sp. 



Fig. VII, 14, p. 53. 



One specimen from Nicaragua, 22-7 mm. long. 



This species is closely allied to P. spinosus, but the inner tubercles and the secondary 

 tubercles in front of them are less pronounced, the sides of the pronotum bear a longitudinal 

 band of punctures above the scars, the posterior intermediate areas of the metasternum are 

 less extensively punctured, the lateral areas are extremely narrow throughout, the 

 punctures in the grooves of the elytra are finer, those in the lateral grooves though 

 moderately coarse not being transverse. 



Passalus spiniger (Bates). 



Rhodocanthopus spiniger, Bates, 1886, pp. 15-16, pi. 1, figs. 16-16«. 



One specimen from Columbia, 22 mm. long. 



This species is very like the last two, but the anterior margin of the head is less broadly 

 and perhaps more sharply notched, the frontal area is scarcely as long or as distinctly 

 punctured, there are no secondary tubercles between the inner and outer tubercles, the 

 sides of the pronotum are more coarsely and extensively punctured, the lateral areas of the 

 metasternum are intermediate between the two in width, and the puncturing of the grooves 

 of the elytra is somewhat coarser than in P. spinosus above and less coarse (scarcely if at all 

 transverse) at the sides, all the transverse ridges being distinct and broadly elevated as 

 in P. spinipes. 



