482 BULLF/riN ().■!, UNITED STATES NATIONAL MUSEUM. 



Sexitypos in my oAvn collection. 



Type-lovallt\j. — Bolcan ]\lountain. 



Salient type -characters. — Body blapyliforni, surface dull, buccal 

 processes of the gena^ produced; prothorax deeply cniar2:inate at 

 apex, angles anteriorly prominent and subacute, base truncate; pro- 

 sternum impressed before the coxse, prominent at middle and ]3ubes- 

 cent. P^lytra truncate and more or less coarsely margined at base, 

 adapted to the prothorax; sculpturing of evident series of small 

 shining muricate tubercles; epipleuras wide, forming the inflexed 

 sides of the elytra. Legs short, femora compressed, tibiie arcuate, 

 tarsi simple. 



Diagnostic characters. — Distinct as defined by the salient type 

 characters, and can not l)e confused with any other species in our 

 fauna. 



General ohserratlons. — The nientum is trapezoidal, coarsely 

 punctate and setigerous, surface concave. 



Prosternum between the coxte feebly grooved, not pronunenl 

 ventrally and with the anterior median prominence forming a con- 

 tinuous and feeble arcuation from tlie apical margin to the tip of the 

 conical mucro. 



Mesosternum deeply conca\e to receive the prosternal mucro, sides 

 prominent around the acetabula, j^ubescent. 



The intercoxal process of the first abdominal segment is rectangu- 

 lar, slightly transverse, equal in length to the post-coxal portion, its 

 width scarcely equal to the combined lengths of the third and fourth 

 segments. 



In the male the post-coxal part of the first segment is about ecjual 

 in length to that of the third, the second is a little longer than the 

 third. 



In the female the post-coxal part is about equal in length to the 

 third, the second scarcely twice as long as the fourth. 



The metasternal salient is about a fourth (male) to a third 

 (female) narrower than the abdominal salient. 



The metasternum laterally between the coxa; is about as long as 

 the width of a mesotibia at middle. 



'J'he superior and inferior surface lines of the femoi-a are distinctly 

 arcuate, most noticeable in llie inferior at middle; the tibial grooves 

 are well defined and subentire, the floor of each is flat, smooth, and 

 abruptly limited by cariniform margins, they are longitudinally 

 convex, the convexity is adapted to the tibial arcuation. 



In the male the lateral surfaces are longitudinally impressed along 

 the inferior margins, not so in the female w hei-e the femora are a little 

 less stout and the grooves limited b\' thinner niar<>'ins. 



