1918.] F. H. Gravely : Passalidae of the World. 51 



unpunctured frontal area, hairless mesosternal scars, metasternal lateral areas and elytra 

 shoulders, and less coarsely punctured dorsal grooves on the elytra. 



Passalus prominens, n. sp. 

 Fig. VII, 11, p. 53. 



One specimen from the Peruvian Amazon, 22 mm. long, and somewhat convex. 



The anterior margin of the head is slightly prominent as in P. eucadorensis, forming 

 an obtuse angle in the middle line ; but the frontal area is larger, being quite half as long- 

 as it is wide in front, and its general surface is smooth and somewhat sparsely marked with 

 large punctures instead of being finely roughened all over. The central tubercle is laterally 

 compressed, with an antero-posteriorly obtuse apex situated behind the junction of the 

 frontal ridges. The frontal tubercles are obsolete. In other respects this species 

 resembles P. gracilis, except that the anterior angles of the pronotum are more acute and 

 the posterior angles (like the hind part of the posterior intermediate areas of the 

 metasternum) are somewhat densely punctured, the anterior ends of the marginal grooves 

 being densely punctured and strongly enlarged. 



Passalus guatemalensis (Kaup). 



Fig. VII, 12, p. 53. 



Oileus guatemalensis, Kaup, 1869, p. 6. 



Three specimens from Nicaragua, ig'6~2o~ß mm. long. 



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

 a vertical and more or less conspicuously exposed clypeus. It should perhaps be regarded 

 as the type of a distinct genus allied to Vindex, but such a course would hardly be justi- 

 fiable at present. 



P. guatemalensis is a somewhat flatter insect than the last, with a more or less 

 punctured obtuse-angled frontal area, the frontal tubercles being situated ab oat half way 

 between the less prominent central and more prominent outer tubercles. The margin of the 

 head between the outer tubercles is straight, with or without a median notch. The sides of 

 the pronotum are somewhat rounded, and the anterior angles are not acute ; the median 

 groove is complete, and the anterior ends of the marginal grooves are scarcely enlarged or 

 punctured ; the scars are transverse and punctured, with a longitudinal band of punctures 

 above them. In other respects this species resembles P. prominens, except that the 

 punctures on the posterior intermediate areas of the metasternum are more widely 

 dispersed. 



Passalus incertus, Percheron. 



Passalus incertus, Percheron, 1841, pp. 27-28, pi. lxxviii, fig. 4. 



Six specimens from the Cauca Valley, and one from Venezuela. Length 19*4-24 '3 mm. 



A slender and somewhat flattened insect, differing from the last only in having the 



clypeus entirely hidden, the median notch of the anterior margin of the head sometimes, 



1 



