264 MEMOIRS ON THE COLEOPTERA 



never dilated or punctate basally; body shorter, more oval and more 

 convex as a rule. [Type PKilenrus cribrosus Lee.]. . Archophileurus 



Phileurus is widely distributed throughout North and South 

 America but does not occur in the northwestern coastal faunas of 

 North America. Archophileurus is much more restricted and is 

 peculiar to the northern Mexican fauna, where it is represented by a 

 number of species. 



Phileurus Latr. 



The body in this genus is oblong, generally distinctly depressed 

 and with shining black and very dense glabrous integuments. The 

 clypeus is very acute and reflexed at apex and the frontal processes 

 are erect or diverging and situated at the extreme sides. The 

 mentum is peculiarly large and tumid anteriorly, coarsely sculp- 

 tured and setulose, impressed on its anterior slope and very obtuse 

 at tip, the basal part more depressed; the last joint of the palpi is 

 long, very slender and cylindric and the antennae, with club as in 

 Strategus, have the joints of the funicle extremely short, broad and 

 compactly joined. The mandibles are slender, well developed, 

 not dentate externally, their acute apex generally feebly everted, 

 with a lower angulation near the tip. The post-coxal process of 

 the prosternum is very short, indefinite and glabrous, somewhat as 

 in Megasoma, but here the tarsi, though having very much the same 

 filiform shining glabrous character, have the basal joint of the 

 intermediate and posterior strongly, obliquely prolonged externally 

 in a long and extremely acute spiniform process; they are also 

 rather shorter than in the Dynastini. In the valgus section, the 

 male is not separable from the female by abdominal characters, as 

 it is throughout the other parts of the Dynastinse, the last segment 

 being of almost identical form in both sexes; the pygidium then is 

 here the only means of sexual identification and even this does not 

 have the sexual modifications assumed in other parts of the sub- 

 family, although the shorter and basally biimpressed surface in the 

 female may be a modification of the transversely ridged form seen 

 in the Oryctids and Dynastids, and the more evenly convex and 

 more strongly punctured surface in the male is a character evidently 

 homologous with the forms frequently assumed in the males of 

 those tribes. In species of the truncatus type, however, the female 

 pygidium, while not differing from that of the male in basal char- 



