694 Coleopferological Notices, VII. 



time since by letter from the author. IS^o allusion to the form of 

 the hind tibiae in polita Bndl., is made in the original descrip- 

 tion, and I can only guess at its affinities as stated in the table ^ 

 it quite possibly does not differ from propinqua. 



The last four species of the table have been previously defined 

 at greater length (1. c, p. 486), but the figures on the plate there 

 presented are not exactly correct, there being no such difference 

 in the relative proportion of the third and fourth joints of the 

 antennae of complectens and tumida, and the median joints in the 

 female of tumida, as figured, are too much swollen. These two 

 species are very much alike in the female, but probably diverge 

 more in the male. 



The abdominal carinse constitute a useful character, but fre- 

 quently differ notably in length and distance asunder in the twa 

 sexes, and all references to them in the table are consequently 

 confined to the male except when the contrary is stated. There 

 also seems to be some individual variability in these carinas inde- 

 pendent of sex, the extent of which I have had no available op- 

 portunity to determine as yet. 



The divisions of the genus by the primary characters laid down 

 in the table are apparently not onh^ taxonomically natural, but 

 geographic as well. For example, the first division is confined ta 

 the continent east of the Rocky Mountains, and does not extend 

 at all further to the westward as far as known. The second divi- 

 sion consists of two sections, one with simple tibiae in both sexes, 

 which is confined entirely to the Pacific coast regions of Califor- 

 nia and thence somewhat to the northward, and another, with 

 spatuliform hind tibiae in the male, which extends entirely across 

 the northern portion of the continent from the Atlantic to the 

 Pacific. The third division is confined to the arid regions of the 

 southwest, or the so-called Sonoran province, and is apparently 

 the only type of the genus occurring there. 



The species announced as new in the table are described below 

 in the same succession, and in every case from the male type only. 



R. subsimilis. — Moderately ventricose, the hind body distinctly elon- 

 gate and suboblong, dark rufo-testaceous throughout, the elytra not paler, the 

 abdomen somewhat darker; pubescence ashy, moderately short and abun- 

 dant and rather coarse. Head distinctly narrower than the prothorax, im- 

 punctate, the fovese strong, deep and forming an equilateral triangle; eyea 

 convex and well developed, at less than their own length from the base. An- 

 iennie a little longer than the head and prothorax, the second joint but slightly 



