460 Mr. Gilbert J. Arrow's Classification of 



The clypeus is produced in the middle where it bears 

 two closely approximate teeth. The frontal carina are 

 directed towards the two outer teeth which they do not 

 quite reach. They are parallel in front, sinuated behind 

 and meet in an acute angle far back upon the head, push- 

 ing the median horn back, so that it forms a backwardly- 

 directed blunt tubercle. The elongate area enclosed by 

 these carinse is densely covered with large annulated pits. 



Einphoroncus occipitalis, Eschs., is excellently described 

 by its author, but the species to which the name was 

 applied by Percheron is an obviously different insect. It 

 is placed in Plooroneosomus by Kuwert, who refers only to 

 the later description. In the Munich Catalogue Esch- 

 scholtz's species is strangely identified with the West 

 Indian Passalus (JVeleus) unicornis, Serv. 



The references are as follows : — 



{Epiplioroncus) occipitalis, Eschs., Nouv. Mem. Soc. Ent., 



Mosc, 1829, p. 21. 

 tetraqonus, Hope, Cat. Lucanoid Coleoptera, 1845, 



p.'28. 

 quadrifo'ons, Perch., Monogr., 1835, p. 64. 



The African Passalidse, which are not very numerous, 

 and form a fairly homogeneous assemblage, were arranged 

 by Kuwert in two principal groups, which he placed far 

 apart. The majority of them form the Mitrorrhinse, 

 named from the American Mitrorrhinus, which he curi- 

 ously associated with them. The other group, the Eriono- 

 minse, he boldly placed in the very midst of the main 

 body of American genera. All really belong to the Lcp)- 

 taulax group of Old World Passalidse, Erionomus forming 

 a section distinguished by its convexity and the hairy 

 sides of its elytra. Two species of this latter genus were 

 separated by Kuwert under the name of Eriopto^us, on 

 account of the existence of two minute projections at the 

 middle of the clypeus, which are inconstant and of little 

 importance. A more important feature by means of which 

 the species may be separated is found in the elytral epi- 

 pleuras. In the two species forming Kuvvert's Eriopterus 

 (E. pilosus, Auriv., and alterego, Kuw.), the marginal costa 

 of the elytron if traced from the apex will be found to shut 

 off anteriorly a broad external strip. In Ei^ionomus late- 

 ricrinitics, Kuw., this strip is very narrow, and in E. 

 planiceps, Eschs., the costa is not continued to the shoulder 



