238 MEMOIRS ON THE COLEOPTERA 



Tribe ORYCTINI. 



If we divide the genus Strategics as indicated above, separating 

 those species having no cephalic or pronotal distinction of the sexes, 

 under the name Anastrategus and it is difficult to see how under the 

 present definition of the Pentodontini any other consistent course 

 could be taken, there is absolute continuity between the Pento- 

 dontini and the Oryctini, but in outward habitus there is so pro- 

 found a difference between the species of the two tribes, due to the 

 conspicuous sexual peculiarities of the male in the latter, that the 

 desirability of segregating them into two tribal groups, even though 

 a somewhat arbitrary procedure, can be maintained with much 

 plausibility. The pronotal modifications of the male in Strategus, 

 even in the most depauperate stages, is of an entirely different 

 character from that seen in either sex of Anastrategus, and I am 

 therefore rather surprised to find Strategus mormon interposed 

 between splendens and cessus, by Dr. G. H. Horn in his short review 

 of Strategics (Tr. Am. Ent. Soc., 1875, p. 145), mormon being truly a 

 Strategus in its thoracic modifications. North of the Mexican 

 boundary in North America there are but two genera of this tribe, 

 which is however represented by several additional genera in the 

 tropical faunas ; the former may be defined as follows : 



Head as in the Pentodontids, without a corniform process in the male; 

 mandibles strong, much exposed, tridentate; mentum evenly convex, 

 generally strongly punctate and setose; prothorax with three erect 

 horns in fully developed males; hind tibiae sinuate externally at apex. 

 [Type Scarabmis aloeus Linn.] Strategus 



Head with a strong erect horn in the male, the prothorax wholly unarmed 

 in that sex; clypeus obtuse, reflexed and bilobed; mandibles much 

 smaller, more conceded, feebly bilobed at tip; mentum deeply ex- 

 cavated at base; hind tibiae 'not sinuate externally at tip, the flaring 

 apex evenly truncate but distinctly crenulate. [Type Geotrupes 

 satyr us Fabr.] Xyloryctes 



I regret that my arrangement of the Pentodontini forces me to 

 place Xyloryctes after Strategus, for its female bears a very sug- 

 gestive resemblance in many ways to the female of Orizabus; 

 however, this is rather a minor point, for Strategus is still more 

 closely allied to Anastrategus and Bothynus. 



Strategus Hope. 



The body in this genus is generally very large and heavy, though 

 some of the less developed males of the ant&us group become very 



