3-1:0 GEO. H. HORN, M. D. 



SO closely placed as to be crowded, but so large that those of one row 

 alternate with the other, the surface between the rows is smooth and 

 glabrous. The summits of the costse have a single row of scale-like 

 hairs, yellowish in color, usually flatly recumbent, sometimes quite 

 erect. 



In about an equal number of species (rarer and but little known 

 in collections) the costse are less elevated, the punctures of the rows 

 smaller and separated by a finer costa, which bears at its summit a 

 row of scale-like hairs similar to that of the principal costa. This 

 sculpture give the appearance of seven finely elevated cost^e in i)lace 

 of four. 



One species has the anterior and middle femora toothed at middle, 

 in all the others the femora are simple. 



The head varies in form in all the species, the most broadly in 

 regularls, narrowest in sulcicollis, and most abruptly constricted in 

 armatiis. 



Based on the above observations the following table is presented 

 as a more satisfactory arrangement of the species. 



Elytra with four discal costse, the intersjjaces coarsely biseriately punctate 2. 



Elytra with seven less elevated costse, the interspaces with a single row of punc- 

 tures 3. 



2. — Scales at summit of costse and at margin of thorax short, inconspicuous, 

 recumbent. 

 Thorax sulcate or longitudinally impressed at middle. 



Head regularly oval, but little longer than wide, sides arcuate, hind 



angles broadly rounded regularis. 



Head elongate-oval, longer than wide, sides nearly straight, oblique and 

 convergent, at base rather abruptly narrowed to the neck. 



suIcicoUii^. 



Thorax convex, at most slight impression at middle of base ; head oblong 



oval, sides arcuate and near the base arcuately narrowing to the 



neck simplex. 



Scales at summit of costse and margin of thorax long, on the costse erect. 

 Thorax with very well marked median sulcus, limited each side by a row 

 of erect scales; head oval, but little louger than wide, sides arcuate, 



rather abruptly narrowed to a neck at base fiinbk*iatii!ii. 



3. — Femora unarmed. 



Thorax narrow, evidently longer than wide, and slightly narrower than 

 the head, the disc not sulcate ; head oval, sides arcuately narrowing 

 from the base of the antennse ; humeri of elytra very obliquely 

 rounded, the hairs at the summits of the cosiie short, bristle-like 



and nearly erect COStipeuiiis. 



Thorax very little longer than wide, as wide as the head, the disc vaguely 

 sulcate; head rather broadly oval, sides regularly arcuate and 

 broadly rounded at the hind angles; elytral humeri rounded, not 

 oblique, the costse with short scale-like, recumbent hairs. 



decipieiis. 



