1880.] 1^'^ [Horn. 



long, in one, however (immanis), the spurs are apparently more closely 

 approximated at base, and are broad, slightly foliaceous at the sides and 

 ■obtuse at tip. 



Characters of minor importance will be found under the various group 

 headings. 



Having, by means of the characters above indicated, approximated those 

 ■hitherto recognized species which seemed closely related, numerous forms 

 have been found which have refused to be separated, especially near rusti- 

 ■cus and jyorosus. I have accordingly placed these as synonyms, and in 

 defence of that course will state, that the mass of material which I have 

 had before me from my own and Dr. LeConte's cabinet fully warrants such 

 a procedure. 



In the bibliography, which will be found at the end of the paper, I have 

 marked those species with an asterisk (*) of which I have seen types or 

 specimens compared directly therewith. 



The following is the table of groups : 



Terminal spur of anterior tibiae trifid A. 



Terminal spur of anterior tibiae dilated at middle B. 



Terminal spur of anterior tibiae slender C. 



A. Posterior tarsi slightly flattened, shorter than the tibia3, the first joint 



very little longer than the second. Hairy species A — a 



Posterior tarsi slender, as long as the tibiae, the first joint nearly as long 

 as the next two together. Glabrous species A — b 



B. Posterior tarsi slender, equal to the tibiae, first joint long ; first joint of 



middle tarsus (^ pubescent at tip. Black species B — a 



Posterior tarsi flattened, first joint short ; first joint of middle tarsus J^ 



glabrous beneath. Species bi-colored or metallic B — b 



O, Elytra with distinct dorsal puncture, first joint of middle tarsus J^ 

 glabrous beneath or with a very small pubescent space. Elytra smooth, 



surface more or less metallic C — a 



Elytra without dorsal puncture, first joint of middle tarsus (^ pubescent 

 over half its surface. Elytra densely punctulate, surface black, sub- 

 opaque, and finely pubescent C — b 



G-roup A — a is peculiar to the Pacific region, C — b to the Atlantic, the 

 other groups contain species from both sides of the continent. 



A — a has been called BicMrus; A — b, Triplectrus; B — a, B — b, Aniso- 

 dactylus; C — a, Haplocentrus. 



A — a, cUlatatus Group. 



Species more or less hairy. Terminal spur of anterior tibiae (^ 9 trifid. 

 Posterior tarsi slightly flattened, the first joint very little longer than the 

 second, the fourth feebly emarginate. Elytra striate, feebly sinuate at tip, 

 the intervals biseriately punctate, dorsal puncture not distinct. 



Male. Anterior tarsi broadly dilated, the first four joints pubescent be- 

 neath, middle tarsi less dilated, pubescent or not. 



