AMERICAN COLEOPTERA. 93 



2::. M. ;is|mis;i Mels. Pr. Ac. Nat. go. Phi la. ii, 314, [Mordella) ; rubrilabris 

 Hel. id. xvi, 106. 



The most common of our species and the one therefore upon which 

 observations can best be made ; its variations are considerable and it is 

 rather surmising that not more species have been made out of it. The 

 legs vary from pale testaceous to dull black, the pubescence from dull 

 brownish-black to bright cinereous, and the head from deep black to dull 

 red ; the latter is rubrilabris of Hel. The eastern species are usually 

 dull black, the pubescence becoming brighter as they come from further 

 west, until California sends the palest specimens. In like manner the 

 color of the head changes gradually from black in the east to dull red 

 in the Pacific States. From New York I have seen no specimens with 

 the head entirely red, although many have it partially so, but a fair pro- 

 portion of California specimens have the head entirely rufous. 



24. M. imlistincta sp. nov. (PI. II, fig. 32). 



Easily known by the pale color and the indistinct basal spot on elytra ; 

 it seems to connect the black species with the following. Seventeen 

 specimens, Adirondack Mts., N. Y. ; my collection. 



25. M. tosla Lee. Pr. Ac. Nat. Sc. Phila. xiv, 49. 



Not uncommon in N. Y., and presenting no noteworthy variations. 



26. M. iiioruata sp. nov. 



Like the preceding in color, but distinct by the combination of 

 tibial and tarsal ridges, PI. II, fig. 33. One specimen, Texas ; Coll. 

 Dr. LeConte. 



27. M. arnica Lee. Pr. Ac. Nat. Sc. Phila. xiv, 49. (PI. II, fig. 19). 

 ■Combination of tibial and tarsal ridges peculiar to this and the two 



following species, PI. II, fig. 34. Superficial examination would lead 

 one to pronounce this and the following identical with the species at the 

 head of the genus, but the ridges separate them sharply. 



28. M. in in ii I ;i sp. nov. (PI. II, fig. 35). 



One of the smallest, if not the smallest of our species ; very distinctly 

 separated from the foregoing by the coloration of head and thorax. 

 One specimen, Georgia ; Coll. Dr. Horn. 



29. M. picilabris Hel. Pr. Ac. Nat. Sc. Phila. xvi, 106. 



Unknown to me in nature but apparently very distinct from the others 

 in this group. 



30. M. infima Lee. Pr. Ac. Nat. Se. Phila. xiv, 49. (PL II, fig. 37). 



For combination of tibial and tarsal ridges peculiar to this and the 

 twelve following species, see PI. II, fig. 36. Distinct from all the others 

 in this group by the cinereous bands on elytra. 



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