DYNASTIN/E 137 



side margins very fine; suture evident, narrowly sinuate at the 

 middle; surface flat, very confusedly, not finely but shallowly punc- 

 tato-rugose, bristling throughout with fine erect setae; prothorax 

 three-fourths wider than long, the sides evenly rounded, more con- 

 verging apically, the angles acute, the sinus arcuate at the middle; 

 basal angles broadly rounded, the base and entire ambient bead as in 

 the two preceding species; surface very unevenly punctate, the 

 punctures coarse and setigerous broadly toward the sides and at apex 

 medially, elsewhere scattered, coarse and smaller and sparser; at 

 lateral fourth, near the apex, there is a punctureless area; scutellum 

 acute, longer than wide; elytra barely at all wider than the prothorax, 

 only slightly longer than wide, parallel, circularly rounded at apex, 

 with coarse though rather shallowly impressed, well separated punc- 

 tures, partially in irregular lines, closer and fine near the sides; 

 pygidium triangular, densely micro-scabriculate and, basally, with 

 small asperate punctures; erect hairs long but not dense; sterna with 

 moderate pubescence; abdomen with the usual lines of punctures. 

 Length (cf) 14.8 mm.; width 8.0 mm. Mexico (Jalapa). 



*jalapensis n. sp. 



A single specimen, received some years ago from a correspondent 

 in the National Museum of the City of Mexico; it does not seem to 

 be allied closely to any described species. The larger claw of the 

 anterior male tarsi is very unequally cleft at tip, the slender ramus 

 not extending as far as the obtusely rounded apex of the thick 

 part of the claw. 



Group III. 



Subgenus Cyclocephala in sp. 



The remarkable modifications of the anterior tarsi and larger 

 claw in the males of this group, exhibit an unexpected diversity 

 among the various species and afford most excellent criteria for 

 the estimation of specific value, showing, among other things, that 

 a considerable number of species have been too hastily confounded 

 because of general external resemblances. It is probable, for ex- 

 ample, that the West Indian signata does not occur in Central 

 America, but is replaced there by several allied forms. The 

 mentum is decidedly large, flat or feebly concave and has a feeble 

 ridge, parallel to and at some distance from each side, bearing long 

 erect setae; the ligular part is abruptly constricted but is not very 

 narrow; the mandibles are slender and usually somewhat everted 

 distally, and the antennal club is small in both sexes. The signifi- 

 cance of the minute and very regular strigilation, well developed 

 as a rule on parts of the last three joints of the anterior male tarsi, 



