Mar. 1S9; ] Fall: On American Species of Ac.\leodera. 5 



ACM.EODER.^ SiNUAT/E. 



The members of this, the largest section of the genus, agree in 

 having the front margin of the prosternum retracted and more or less 

 prominent on either side of the middle. \x). scapular is, pubiventris, 

 lanata, fcnyesi, recticollis, plagiaticmtda, jocosa, coqiiilletti, miliaris, 

 and sparsa, the prominence is dentiform, and though not equally- 

 strong, is conspicuous in all. In flavomar^^inata the prosternum is 

 broadly subangulate, and this angulation becomes more rounded and 

 less advanced through Jiiaciilifcra, ainplicollis, disjiiucta, etc., until in 

 co/ivicfa, Serena, tiita, liepbiirnii and quadriseriata the margin becomes 

 scarcely more than broadly undulate. It must be borne in mind that 

 specimens occur in many species and are likely to in all, in v^^hich the 

 sinuation is decidedly more or less marked than is usual in the species ; 

 therefore too much stress must not be laid upon this character when 

 unsupported by others. The elytra in cuprina and scapnlaris exhibit a 

 discal costa, quite strong in the former, less marked in the latter 

 species; jiavoinarginata, some specimens oi fenyesi 2Si^ occasional in- 

 dividuals of other species show traces of this costa. The thoracic spot 

 is so far as observed constant either in its presence or absence in all 

 but two species — scapnlaris and hepbitrnii — in both of which the spot 

 is rarely lacking. The tarsi are in all species more or less evidently 

 longer than one-half the tibiae. The apical ventral plate is more or 

 less defined in all except macra, scapnlaris and pnlcherj-ima, but is 

 very small in tnta. The thirteen species tabulated by Horn iiave now 

 increased to twenty-eight ; they may be separated as follows : 



Thorax more or less distinctly wider than the elytra, side margin usually well defined, 



and visible (except in claiisa, robiista and convicta) in its entire extent from above . I 



Thorax not wider than the elytra, side margin very narrow, becoming inferior, at least 



posteriorly 9 



1. Elytral punctures very coarse, nearly obliterating the intervals except the intra- 



humeral, which is costiform ; color greenish bronze without ornamentation. 



cuprina. 

 Elytral punctures finer, intervals distinct, body above ornate 2 



2. Thoracic margin rather wide, distinctly reflexed 3 



Thoracic margin narrow, not reflexed 8 



3. Reflexed margin suddenly narrowed and nearly obliterated just before the hind 



angles, marginal spot small, posterior Scapularis. 



Reflexed margin a little narrowed before the hind angles which are produced out- 

 ward in the form of an obtuse lobe maculifera. 



Reflexed margin equally broad throughout 4 



