AMERICAN COLEOPTERA. 



ELMIS, Latr. 



35 



Elmis, Latr. Hist. Nat. cl. Fourm, 1S02, p. 396. 



Limnius, Miiller, lUig. Mag. V, 1806, p. 188. 



Our species are as follows : — 



Thorax with even surface; no elevated lines : 



Thorax luteous or slightly ferruginous; scarcely broader 



,, , „ vittatus. 



than long 



Thorax luteous, apical and basal margins blackish ; broader 



, bivittatus. 



than long •, • 4. * 



Thorax black, slightly bronzed, scarcely broader than long.quadrinotatus. 

 Thorax with a distinct lateral elevated line : , . ^ ,. 



Line extending from base to middle only; elytra without elevated lines. 



Elytra with two oblique vittse elegans. 



•^ r fastiditus. 



Elytra with one oblique vitta | ovalis. 



Elytra with a humeral and sub-apical rounded spot quadrimaculatus. 



Line entire, extending from base to apex : 



Elytra smooth, shining, with lateral elevated lines: 



Disc of thorax with transverse impresssion glaber. 



f nitidulus. 

 Disc of thorax smooth | latiusculus. 



El vtra opaque: 



Without lateral elevated lines moestus. 



With lateral elevated lines abnormis. 



Thorax with surface obliquely plicate: 



I pusillus. 

 Sides of thorax sinuate ( similis. 



Sides of thorax rounded from base to apex ferrugineus. 



E. vittatus, Mels. Proc. Acad. 1844, p. 99 ; Lee. Proc. Acad. 1854, 217. 



Length .12 iucli; 3 mtu. 



:\Iid(lle States. 

 E. bivittatus, Lee. Proc. Acad. 1852, p. 44. 



Length .14 incli; 3.5 mm. 



Collected in the upper Mississippi River. 

 E. quadrinotatus. Say, Journ. Acad. V, 187; Lee. Proc. Acad. 1852, p. 44. 



Length .09 inch; 2.25 mm. 



Middle States and Canada, also Fort Wingate, N. M. 



These three species are closely allied and are difficult to distinguish 

 in description. All agree in a similarity of coloration an elon^gate 

 form and, consequently, a more decidedly elongate scutellum. They 

 have also the prosternal lobe much less prominent than m the species 

 ^hich follow, the parts of the mouth are less concealed beneath, the 

 head more prominent and the front less deflexed. They differ as fol- 

 lows ; hiclttatus is the larger form, its thorax is decidedly (at least oue- 

 third) broader than long, more convex and with the apical and basa 

 margins and also the sides blackish; the sides are rounded and near 



