96 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io4 



The inevitable conclusion must be that all three forms- — M. aeneus 

 Fabricius, M. dauricus Motschulsky, and M. rufimanus LeConte— 

 constitute divergent branches from, a common ancestral stock. At 

 the two extremes a barely sufficient differentiation has been reached 

 to entitle us to regard them as distinct species. M. dauricus Mot- 

 schulsky, in the intermediate position, should be considered as a sub- 

 species of M. rufimanus LeConte, to which it lies closer both in its 

 morphological characters and in its geographical distribution. 



The synonym.}^ of M. rufimanus LeConte thus becomes: 

 M. rufimanus LeConte, 1857 

 M. moerens LeConte, 1857 

 Af. ruficornis LeConte, 1859, nee Heer, 1841 

 M. mutatus Harold, 1868 

 M. calif amicus Reitter, 1871 



M. aeneus of American authors (ex parte), nee Fabricius, 1775 

 subspecies dauricus Motschulsky, 1849 

 subspecies viridipennis Motschulsky, 1866 



The synonymy of M. aeneus Fabricius should be amended by the 

 deletion of dauricus Motsclmlsky, rufimanus LeConte, moerens 

 LeConte, viridipennis Motschulsky, and californicus Reitter. 



In considering the distribution of this species, we note that Le- 

 Conte's rufimanus was found in California, moerens in Oregon, and 

 ruficornis in Kansas. Reitter's californicus derived from California. 

 Horn recorded rufimanus from California and Oregon, and he con- 

 sidered mututus to range from New York to Colorado. Parsons 

 reiterated this distribution for mutatus but stressed its abundance in 

 the mountainous region from Montana to Arizona and New Mexico. 

 He reported aeneus from British Columbia (based no doubt on 

 Criddle's 1922 record), and from Montana to California, Arizona, 

 New Mexico, Tennessee, Indiana, Pennsylvania, and Maine. Blatch- 

 ley (1910) included both aeneus and mutatus in his "Coleoptera of 

 Indiana," while Blackwelder (1945) includes Mexico within the range 

 of "M. aenea F." 



Examples of M. rufimanus LeConte in my collection and those 

 whose identity I have personally confii-med are derived from the 

 localities that follow. 



Canada: British Columbia: Lorna, Little White Mountain, Oliver. 

 Saskatchewan: Pennant. Manitoba: Aweme. :^- 



United States: Washington: Spokane. Oregon: Mitchell. 

 California: Very numerous localities throughout the State. Idaho: 

 Lewiston, Coeur d'Alene. Nevada: Austin. Utah: Salt Lake City, 

 Zion Canyon, Little Cottonwood Canyon, Wasatch Mountains, 

 Monroe, Richfield, Bountiful, Alta, Lehi, Park City, Coalville. Ari- 

 zona: Globe, Mount Lemmon, Oracle, Huachuca Mountains, Flag- 



