44 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



A specimen before me has been compared with the LeConte type 

 and pronounced typical by Mr. F. Blanchard. 



This species has been considered as identical with carhonaria^ and I 

 agree with Col. Thomas Casey " in considering it a distinct species. 



The genital characters are somewhat aberrant to the present sub- 

 genus, but on account of the greater development of the external lobe 

 of the valvular apex, I have placed it here; the apical margin of the 

 dorsal plate is quite squarely truncate and the appendage more 

 strongly exposed. In all specimens examined the female genital 

 characters were constant. . 



On account of the liomogeneous structure exhibited by the small 

 series before me, I am unable to indicate with any feeling of certainty, 

 its relationships and descent. A large series illustrating the lines of 

 variation is necessary for this purpose. I might tentatively suggest 

 that dehilis may tend toward the subgenus Prom/us. I would about 

 as soon accej^t this postulate as to consider it identical with car- 

 honaria. 



The mentum ^ is moderate in size, and more or less triangulo- 

 trapezoidal in outline; surface rather coarsely and somewhat densely 

 punctate, laterally with rather broad, shallow, and subfoveate im- 

 pressions, with a median longitudinal subcariniform convexity; each 

 puncture bears a short inconspicuous seta. 



The prosternum between the coxa* is rather prominent ventrally. 

 convex to nearly horizontal and mucronate behind. The mucro is 

 variable in size, sometimes pointed and at others broad and obtusely 

 rounded. 



The mesosternum is more or less arcuately oblique and concave. 



The intercoxal jDrocess of the first '' abdominal segment is slightly 

 transverse and equal in length to the post-coxal portion. The meta- 

 sternal salient is about two-sevenths narrower than the abdominal 

 process. 



In the male the second abdominal segment is equal in length to the 

 post-coxal part of the first and about a third of its length longer 

 than the third segment, the latter being about a fourth of its own 

 length longer than the fourth segment. 



In the female the second segment is noticeably longer, being about 

 a fourth of its own length longer than the post-coxal ]iart of the first. 

 The fourth is about half as long as the second, while the third is 

 about a fourth of its own length longer than the fourth. 



The i)rofemora are somewhat tumid externally, the tibial grooves 

 are well developed, concave, and glabrous, margins subcariniform, 

 converging and meeting at basal third. 



"VII. roleoptorolosical Xoticos. II, Oct. 0, 1890, p. ;396. 



^Tlie meutniu I'efers to the middle lobe unless otherwise stated. 



'' 111 all (lesciMiit ive remarks only the visible se^'iiieiits are considered. 



