DYNASTIN^E 165 



The type of the first of the above species was received under the 

 name sangidnicollis Burm., but the description of Burmeister will 

 not apply satisfactorily to either it or politicauda. It is probable 

 that the genus will include sanguinicollis, however, as well as 

 epistomalis Bates, Icevicauda Arrow and some others; the latter 

 species is probably allied closely to atriceps, but is larger, apparently 

 more elongate and the pygidium is said to be piliferously punctulate ; 

 it is also from a different locality Guatemala. The above species 

 are all represented by single examples. 



The genera Halotosia and Aclinidia, of the table, need not 

 occupy further attention at present; the former is founded upon the 

 very isolated Cyclocephalafasciolataoi Bates, having not only a very 

 distinctive scheme of ornamentation, but an extremely broad ligula, 

 and the latter upon the Gryllotalpid-like castanea Fabr., having not 

 only a remarkably different facies from any other species, but 

 rather radically specialized abdominal structure in the male. It 

 is true that the essential generic characters of many of the genera 

 here proposed are sexual in nature, but such criteria in many 

 parts of the Coleoptera are necessary and legitimate, as for example 

 in some sections of the Pselaphidae. 



Dyscinetus Harold. 

 Chalepus MacL. 



The mandibular differences between Dyscinetus and the true 

 Cyclocephalids are so radical, and accompanied by such marked 

 divergence in the general habitus of the body, that it and some 

 other allied generic and subgeneric groups of species should be 

 considered a distinct subtribe of the Cyclocephalini in any complete 

 treatment of the tribe. The body is elongate, subparallel, only 

 moderately convex, generally deep black in color and with much 

 thicker and denser integuments than in most of the true Cyclo- 

 cephalids. The species are numerous and distributed almost 

 throughout both of the American continents, excepting the Pacific 

 coast provinces. There are at least two subgeneric groups as 

 follows : 



Claw-joint of the anterior male tarsi swollen, the inner claw notably large, 

 unequally split at apex, with the smaller ramus very slender as usual 

 in the tribe Group I 



Claw-joint not at all swollen, slender, the larger claw of a completely 



