DYNASTIN/E 109 



and placed it at the head, its many analogies with the Cyclocephalini 

 demanding that it be not far removed therefrom in any event. The 

 Agaocephalini are represented north of Panama only by two species 

 so far as known Lycomedes mniszechi and beltianus. These two 

 tribes are introduced above merely for comparison and in order that 

 the entire Dynastid fauna of the western hemisphere may be more 

 fully represented in the table. 



Tribe CYCLOCEPHALINI. 



The American continents are the true home of this tribe and here 

 they exist in great number and variety, both generically and specif- 

 ically. Only two genera, as understood by Lacordaire, belong to 

 the old world fauna Brachyscelis and Peltonotus, but the latter, 

 .as well as the genus Pachylus, has recently been transferred to the 

 Rutelinse by Mr. Arrow. There are no sexual differences pertaining 

 to the head or pronotum, but the anterior tarsi are decidedly 

 modified in the males of all but one or two genera, being stouter 

 than in the female, with the last joint swollen as a rule and having 

 the claws extremely unequal, the larger very stout, usually dentate 

 within and abruptly bent at base and unequally cleft at tip, the 

 upper ramus small and slender, sometimes wanting as in Cyclo- 

 cephala signata; occasionally the larger claw is of a radically different 

 structure, being divaricately forked, as in Dichromina and Palechus. 

 The tarsi are slender and filiform, generally long and more Melo- 

 lonthid in structure than Dynastid. Lacordaire assumes con- 

 siderable importance for the frequent immargination of the pronotal 

 base, but there is so much diversity in the conformation of the 

 basal margin, that it is really not so significant as it would appear; 

 in many forms the edge is wholly without beading or the so-called 

 margin, as in many Rutelids, as well as in most of the Pentodontini, 

 but in almost as many more it takes the form either of a fine entire 

 doubling of the edge, as in Cyclocephala proper, or a thick and more 

 or less entire marginal bead, best developed in Augoderia, Har- 

 poscelis, Anoplocephalus and in one group of Stigmalia, but fre- 

 quently seen toward the sides of the base in species of other genera, 

 either as a rule or exceptionally. The large number of species in 

 the heterogeneous Cyclocephala of Burmeister and Lacordaire, lend 

 themselves very well to generic subdivision so far as now seems 



