1918.] 



F. H. Gravely : Passalidae of the World. 



53 



and hairless, and the middle and hind tibiae usually unspined or nearly so. 1 The 

 •difference is most marked as regards the punctures in the dorsal grooves of the elytra, those 

 in the pair of grooves nearest the suture being almost impunctate in most specimens of the 

 present species. 



Fig. VII. 

 Passalus spp. ; specific characters in the 



1. P. rugosus, Gravely. 



2. P. punctato-striatus, Percheron. 



3. P. rhodocanthopoides (Kuwert). 



4. P. morio, Percheron. 



5. P. latifrons, Percheron. 



6. P pertyi (Kaup). 



7. P. quitensis (Kaup). 



8. P. catherinae, Gravely. 



9. P. eucadorensis, Gravely. 



10. P. curtus (Kaup). 



11. P. prominens, Gravely. 



12. P. guitemalensis (Kaup). 



upper surface of the head x 4. 



13. P. interstitialis, Eschscholtz. 



14. P. spinipes, Gravely. 



15. P. abortivus, Percheron. 



16. P. mucronatus, Burmeister. 



17. P. quadricollis Eschscholtz. 



18. P. occipitalis, Eschscholtz. 



19. P. nasutus, Percheron. 



20. P. polli, Gravely. 



21. P. punctatissimus, Eschscholtz. 



22. P. opacus, Gravely 



23. P. glaber, Gravely. 



24. P. erosus, Truqui. 



Passalus rhodocanthopoides (Kuwert). 



Fig. VIT, 3. 

 Neleicops rhodocanthopoides, Kuwert, 1898, pp. 142-143. 



Several specimens from Peru (Cumbasa and the Amazon region). Length 24-25 mm. 



A somewhat flatter insect than the preceding, with the inner tubercles situated 

 almost vertically behind the outer tubercles but separated from them by a well marked 

 concavity. The posterior intermediate areas of the metasternum are coarsely punctured, 



1 One of the Mexican specimens has numerous small spines on these tibiae, and the Columbian specimen has them 

 numerous and very strong. The latter specimen has the elytra more coarsely punctured than any otner that I have 

 seen and may prove to belong to a different species. 



