NORTH AMERICAN COLEOPTERA. 11 



trochanter nearly one-half as long as the femnr ; femora robust ; first joint of 

 posterior tarsi not equal in length to the next two together ; inner terminal 

 spur of anterior tibiae very long, robust at base ; outer apical spurs, three in 

 number, very stout ; on the under surface and in the middle of the distal 

 edges of the first two joints of the anterior tarsi, there is a short, acute tooth, 

 projecting at right angles to the axis of the joint. Length 9.5 mm. 



"Willets Point, Long Island ; one specimen, % . 



This species resembles fallax, and differs from that species super- 

 ficially in its proportionally longer elytra and shorter prothorax ; also 

 in the posterior angles of the latter, which are more broadly rounded. 



H. niutaliilis Hald. 



This appears to be a valid species, the differences between it and 

 herhivagus Say, lying principally in its smaller size, more narrow 

 and convex form, and in the structure of the prosternal intercoxal 

 process ; the prothorax is also relatively much longer and narrower 

 than in that species. Before determining the species in. my cabinet 

 from Dr. LeConte's collection, I had already separated the two species, 

 which can very readily be done by the unaided eye, indicating a dis- 

 tinct difference of facies ; mutahilis is much the smaller of the two. 



The five folloAving species are the result of a study on a number of 

 specimens, all of which were included in my cabinet under the name 

 viridiceneus Beauv., and was as much a source of surprise to me as it 

 may perhaps prove to others. They are separated by the setigerous 

 punctures of the epistoma, and in this respect are more distinctly 

 characterized than many more marked species of this difficult genus. 

 I had long been inclined to think that a much smaller and narrower 

 form was a distinct species from vii-idiaineus, but was not prepared to 

 find such a variety in the others, which greatly resemble each other. 

 They are all metallic-green species, and may be clearly separated as 

 follows : — 



Epistoma bearing two closely approximate and unequal setigerous punctures 

 at eaeli anterior angle ; also two, more widely separated, in the middle, 

 nearly on a line with the pairs at the angles vil'idiaeiieus. 



Epistoma bearing two closely approximate and nearly equal setigerous punc- 

 tures at each anterior angle, and in addition, two rather more distant 

 punctures in the middle and near the posterior margin COllTictor. 



Epistoma bearing two closely approximate setigerous punctures at each 

 anterior angle Caiioilicus. 



Epistoma having but one setigerous puncture at each anterior angle. 



Larger species. Head large ; elytra wider than prothorax llistralis. 



Smaller species. Head smaller ; elytra as wide as prothorax. 



aenesceus. 



