■60 Memoirs of the Indian Museum. [Vol. VII, 



Passalus abortivus, Percheron. 

 Fig. VII, 15, p. 53. 



Passalus abortivus, Percheron, 1835, pp. 87-89, pi. vi, fig. 7. 



Three specimens from the Amazon, of which at least two are from Peru. Length 

 28"o-28"3 mm. long. One specimen with deformed antennae. 



This species differs from all other species of Passalus known to me in sometimes having 

 a distinct lamella in front of the three ordinarily found on the antennae of species of this 

 genus. This lamella, however, is not fully developed as are the additional lamellae found 

 in the genus Paxillus, but is either much slenderer than those following it as well as only 

 about half their length, or is quite short and inconspicuous. 1 The anterior margin of the 

 head bears a pair of small but well developed tubercles on either side of the median notch, 

 which is consequently much more pronounced than is ever the case in Paxillus. The 

 cephalic tubercles and ridges closely resemble those of Passalus spiniger. The pronotum 

 resembles that of P. spiniger in shape, but is unpunctured except in the scars and marginal 

 grooves. An oval patch a little below the middle of the mesothoracic episterna, the 

 mesosternal scars, the lateral areas of the metasternum, and the lower parts of the 

 shoulders of the elytra (but not the epipleura) are covered with hair-bearing punctures. 

 The posterior intermediate areas of the metasternum are coarsely punctured behind and 

 •on the inner side. The elytra are strongly and uniformly punctured. The middle and hind 

 tibiae bear from one to three spines which are stronger on the former than on the latter. 



Passalus jansoni (Bates). 



Phoroneus jansoni, Bates, 1886, p. 18, pi. i, figs. 17-17a. 



One specimen from Nicaragua, 32 mm. long. 



This species is very like the last, but the triconcave margin of the head between the 

 outer tubercles is thickened and lightly convex as a whole ; the frontal area and the 

 pronotum (even in the scars and anteriorly weak marginal grooves) are unpunctured ; 

 the mesothoracic episterna, the mesosternal scars, the metasternum and the elytra are 

 hairless, the second and third being entirely unpunctured, and the last being punctured 

 in the lateral grooves only ; and there are no very distinct spines on the middle and hind 

 tibiae. 



Passalus mucronatus, Burmeister. 

 Fig. VII, 16, p. 53. 

 Passalus mucronatus, Burmeister, 1847, pp. 488-489. 



One specimen from Columbia and one from Guatemala. Length 24 mm. 



The head and pronotum resemble those of the preceding species in outline, but the 

 central tubercle is much elongated with free decumbent apex, the frontal ridges are feebly 

 developed, the anterior margin of the head is not thickened, and the sides of the pronotum, 

 including the scars and anteriorly enlarged marginal grooves,, are strongly punctured. The 



1 In one of our two specimens in which the antennae are not deformed it is slender and about half the length of 

 the others ; in the other it is scarcely if at all different from the enlargement often found in the same position in other 

 species. 



