210 BULLETIN 63, Lt^TTED STATES NATIONAL MUSEUM. 



In the series of examples before me the mentum is variable. 

 Although large, it is moderate when taken in a comparative sense, 

 var^nng from trapezoidal to quadrato- or parabolo-trapezoidal; apex 

 truncate to evenly arcuate; surface scarcely convex, strongly punctate 

 and almost scabrous, feebly foveate at the basal angles. 



The prosternum is variable and strongly protuberant ventrally 

 with the coxse, being almost declivous from the anterior margin. It 

 is usually longitudinally grooved between the coxa^, rounded antero- 

 posteriorly, and not mucronate behind, or wdth an abruptly developed 

 mucro; at times convex between the coxa? and subtruncate behind, 

 with a deflexed mucro. 



The mesosternum is arcuately or obliquely declivous and more or 

 less strongly concave. 



The abdominal process is about a fourth of its width wider than 

 the metasternal salient, subquadrate, and equal in length to the post- 

 coxa 1 portion of the first segment, wdiich is also equal to the third, the 

 latter one-sixth of its length shorter than the second ; the fourth is 

 one-half of its length shorter than the second. 



Metasternum laterally between the coxa^ is about as long as the 

 width of a mesotibia at apex. 



Femora stout. The profemora are thickest at the junction of the 

 outer and middle thirds, from that point gradually narrowing each 

 way. Tibial grooves moderateh' large, edges rather thick, subcarini- 

 form, very feebly arcuate, and converging to become contiguous a 

 short distance before the base; floors ver}^ feebly concave, subopaque, 

 and extremely, finely, and reticulately rugulose. Anterior margin 

 denlately laminate at the outer fourth. 



Meso- and metafemora of nearly the same width tliroughout ; sides 

 quite parallel. 



Mesofemora with the grooves moderate in width, margins feebly 

 ca rill i form, converging very gradually to become evanescent a short 

 distance from the base; floors of the grooves scarcely concave, opaque 

 as on the profemora. 



The metafemora liavc the grooves about moderate m width, with 

 the sides feebly cariuiform, gradually converging to become evanes- 

 cent at basal third; the floors are as on the jii-ofcmora. 



The protibise are slightly compressed, cai-inate in l)asal iialf exter- 

 nally, with the tarsal grooves more or less feebly develo})e(l, asi)erate 

 and limited posteriorly by a nniricato-serrulate margin, articular 

 cavities closed. 



Mesotibia^ more or less rounded, briefly or obsoletely carinate exter- 

 nally just before the base; tarsal grooves simply indicated by a 

 smooth <)])a(|iie \i\u\ or feebly channeled surrounding surfaces muri- 

 cate; articular cavities closed. 



