Place of publication:
Amer. J. Sci. Arts ser. 2, 14:336. 1852 (W. H. Emory, Not. milit. reconn. 158. 1848, nom. inval.)
Comment:
publication by Engelmann in 1848 was provisional, as he stated: "the names given by me, must remain doubtful till we are able to obtain some more data to characterize the species"