DYNASTIN/E 141 



Form slightly stouter, similarly shining; upper surface and legs dark cas- 

 taneous in color, the pronotum rather more yellowish; head (9) 

 black, pale anteriorly and on the clypeus, the latter of the usual 

 form in this section and with the rugulosity similarly transversely 

 wavy and interlacing, the suture very fine, sinuate medially; pro- 

 thorax one-half wider than long, similar to that of the preceding 

 species, the punctures however unusually strong and distinct, with 

 some coarse setigerous punctures near the apical angles; scutellum 

 very acute, with some small but distinct sparse punctures; elytra 

 with only a minute black spot behind the middle of each in the type, 

 the lateral callus also black; punctures decidedly strong though 

 sparse, for the most part in regular series except suturally; lateral 

 swelling more extended and complex than in the preceding, the part 

 near the edge behind the middle ridge-like and forming an angle, 

 extending anteriorly in a strong ridge to basal two-fifths; the sinus 

 of the edge below the short angulate black ridge is very short and 

 subangulate, being deeper but not longer than in beaumonti; pygidium 

 rather more punctured, with the marginal gutter around the nar- 

 rowly rounded apex coarser and deeper; under surface brown, the 

 sides of the hind body and almost the entire abdomen, black, the 

 last segment brown and with a coarse deep median channel, which 

 is broad at base and acute apically. Length (9 ) 13.3 mm.; width 

 7.0 mm. Brazil *auriculata n. sp. 



The species described as from Chiapas and Orizaba, Mexico, 

 under the name detecta, by Mr. Bates, differs from any of those 

 above denned in its larger size and by the smooth or non-strigilate 

 joints of the anterior male tarsi. 



One of the most conspicuous features of this most interesting 

 group of species, is the remarkably varied and radical sexual pecu- 

 liarities apparent in nearly all parts of the body, including the 

 sculpture and the sparse setae of the upper surface and sculpture 

 and pubescence of the pygidium, besides the usual sexual modifica- 

 tions of the anterior tarsi and abdominal apex in the male, and of 

 the sides of the elytra in the female. Taking it altogether, it is 

 probably the most highly specialized and sexually differentiated 

 group of the entire tribe. 



Ochrosidia n. gen. 



The body in this genus is of moderate or small size, oblong-oval 

 or narrower and elongate form and convex surface, and is more or 

 less pallid in coloration throughout. The ligular part of the men turn 

 is rather constricted and is truncate at tip, or more or less obtusely 

 bilobed on a lower plane than the apparent tip. The clypeus is 



