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



with Terres and Veturius respectively, as would have been more consistent. Proculejus 

 quitensis consequently becomes Passalus quitensis. 



In spite of the complex manner in which various specific characters are intermingled 

 the species of Passalus can be arranged in a series leading up from forms with the margin 

 of the head between the outer tubercles straight or faintly notched in the middle line, the 

 inner and outer tubercles usually more or less widely separated, and the lateral areas of 

 the metasternum usually narrow, smooth and hairless, to forms with the margin of the head 

 abruptly emarginate in the middle line, the inner and outer tubercles in contact with one 

 another, together forming an oblique edge, and the lateral areas of the metasternum broad, 

 punctured and hairy. The following descriptions have been placed in this order. 



Passalus nanus (Kuwert). 



Rhodocanthopus nanus, Kuwert, 1898, p. 139. 



One or two specimens from each of the following localities— Guatemala, Ecuador, 

 -and the Cauca Valley in Columbia. Length 15-3-17-7 mm. 



This species is very like Paxillus robustus, but its antennae have only three well 

 developed lamellae, its frontal ridges are apt to be more denticulate (especially in Columbian 

 specimens), its eyes are smaller and less prominent, its pronotum and elytra are much more 

 coarsely punctured, the punctures in the lateral grooves of the elytra being more or less 

 distinctly transverse, and its intermediate and hind tibiae are still more strongly spined. 

 The epipleura are unpunctured and hairless as in Paxillus robustus. 



Passalus rugosus, n. sp. 

 Fig. VII, 1. 



Three specimens from the Cauca Valley, Columbia. Length 21-0-21-8 mm. 



The central tubercle is relatively nearer to the anterior margin of the head than in 

 _P. nanus, the frontal ridges consequently diverging in a more obtuse angle. The sides of 

 the pronotum are very coarsely punctured, but there are no coarse punctures nearer the 

 middle as in C. nanus, nor are there any on the central area of the metasternum as in that 

 species. The grooves of the elytra are even more strongly punctured than in C. nanus, the 

 punctures in the lateral grooves being distinctly transverse. The epipleura are punctured 

 -and hairy. In other respects this species resembles P. nanus. 



Passalus punctato-striatus, Percheron. 

 Fig. VII, 2. 

 Passalus punctato striatus, Percheron, 1835, pp. 78-79, pi. vi, fig. 1. 



A large number of specimens from Guatemala and Mexico, some of the latter being 

 from Oaxaca ; a few from San Salvador, Honduras (San Pedro Sula), Nicaragua, Columbia 

 and Surinam. Length 20-3-28-3 mm., relative breadth extremely variable ; the distance 

 between the inner and outer tubercles, and other characters, also variable to some extent. 



This species differs from the last only in having the frontal area slightly larger, the 

 pronotum and the grooves of the elytra less coarsely punctured, the epipleura unpunctured 



