132 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



tinctly serial arrangement, the tubercles in each series of uniform 

 size, the larger very moderate, the strial quite small. 



In the specimens of obtusa the arrangement is similar and tlie 

 sculpturing more opaque, somewhat eroded or of a worn appear- 

 ance. A large series is needed to fully establish the relationships 

 between these difl'erent forms, and also between them and letcJicr! 

 and candy kei. 



Letcheri is of similar form but with the elytra distinctly pubes- 

 cent, the hairs are long, sparse and flying; the sculpturing is nniri- 

 cato-granulate. but not very asj^erately so. the granular character is 

 distinct and the surface luster is dull. 



In randyliel the luster is more shining and the elytra are not at 

 all pubescent, but distinctly granulo-muricate, with short, stiff setje, 

 the muricate condition }n'edominates, each eminence is a prickle and 

 the granular character obscured. The sculpturing is not at all 

 coarse. 



Granom is recognized by its coarser sculpturing and nuich more 

 coarsely and densely rugoso-punctate pronotum. 



The anterior femora are mutic and scarcely sinuate: forms of 

 (jrarudatd are more or less muricate, (jraiw!<<( less so, and besides the 

 integuments are denser and generally o])aque, although Xevada 

 examples are shining. 



Sober named a species Huba.speiut, and it is doubtful whether it is 

 the present species or not ; Dr. George Horn places it as a doubtful 

 synonym of (jnundata^ and writes that if it should prove identical 

 the present name must be supjjressed and Solier's name be reinstated. 

 I have not been able to settle this point. 



The mentum is moderately large in the females of the tuberculate 

 form, smaller in the male; rather small in ohtnsd. Usually subtri- 

 angular, rarely subparabolic and more or less scabrously sculptured, 

 scarcely convex, usually somewhat broadly and feebly excavated, 

 and not noticeably setigerous. Lateral lobes small and inconspicuous. 



The prosternum is more or less convex between the coxae, feebly 

 l)roduced and more or less vertically truncate behind, angle some- 

 times nuicroid, that is with an angle having the shape of a mucro. In 

 the type of granidatd the prosternum is produced behind and slightly 

 prominent posteriorly in ohfiisa. 



The mesosternum is more or less obliquely arcuate, broadly and 

 more or less deeply concave. 



The metasternum laterally between the coxa^ is as long as the width 

 of a mesotibia at apical fifth. 



The abdominal process is quadrate (male) or slightly transverse 

 (female) and e(|ual in width to (male) or one-fourth of its width 

 Avider (female) than the metasternal salient. 



