240 MEMOIRS ON THE COLEOPTERA 



to the southern Atlantic parts of North America and the Antillean 

 regions. 



Group I. 

 Subgenus Strategus in sp. 



All the species of this group occurring in the Sonoran and Central 

 American faunas, excepting jugurtha Burm., are of the aloeus and 

 julianus types, and they are rather more numerous than hitherto 

 supposed. They are generally large, broadly oval and of a cas- 

 taneous color, the head and prothorax usually of a darker tint, 

 though a few females at hand are almost completely black above. 

 They all have the clypeus rather broadly and angularly sinuate in 

 the male, while in jugurtha it is acuminate, and in that species the 

 posterior thoracic horns are longer and more slender, so that it 

 does not belong properly to the aloeus section of the subgenus. 

 The various species are as follows, the descriptions being from the 

 male when at hand : 



Basal joint of the hind tarsi broader than the following as usual and 

 flattened, but subparallel and never having its external angle 

 prolonged 2 



Basal joint much shorter, more triangular, its external angle obliquely 

 and strongly produced as in Xyloryctes, the body in general features 

 harmonizing very closely with julianus 8 



2 Hind tarsi moderately slender; mandibles (9 ) with the middle tooth 

 large, very obtusely rounded, occupying at least half the total length 

 of the exposed part of the mandible and generally much more. . . .3 



Hind tarsi very slender distally; mandibles (9) with the middle tooth 

 relatively much smaller though rounded, occupying much less than 

 half the total length; eyes more developed; body smaller in size. . .7 



3 Front with the usual two well separated tubercles 4 



Front with two postero-inwardly oblique ridges, meeting at the anterior 

 end of the punctureless median anterior prolongation of the basal 

 smooth area of the head 6 



4 Hind tarsi unusually long, as long as the tibiae; pronotal ridge almost 

 obsolete, barely traceable. Body (d* 1 ) large, very stout, oblong-oval, 

 shining, black or nearly so, obscure castaneous beneath, the tarsi 

 black; head nearly as in julianus but having the tubercles small, 

 rounded, abrupt and more widely separated, the broadly and 

 obliquely bilobed apex of the clypeus strongly upturned; middle 

 tooth of the mandibles very large, high and rounded, larger than in 

 julianus; prothorax nearly similar in form and sculpture, except that 

 the rugosity extends unmodified entirely across the large cavity; 

 apical process not binodose or but very finely and imperfectly; 

 scutellum rugose, the margins smooth; elytra broader, barely longer 

 than wide, rounded at apex behind the middle, the surface as in 



