Proceedings of the United States National Museum
: KEVISION OF THE BEETLES OF THE GENUS DISONYCHA OCCURRING IN AMERICA NORTH OF MEXICO By Doris Holmes Blake Assistant Entomologist, Bureau of Entomology, United States Department of Agriculture HISTORY OF THE GENUS The generic name Disomjcha Chevrolat first appeared in the Dejean Catalogue of 1837 ^ with 31 species listed under it. In 1844 Chevrolat - defined the genus as follows Disonycha (5/s deux, '6vv^ ongle). Geure de Col^opt^res tetrameres, famille des Cycliques, tribu des Alticites, cr^e par nous, et adopts par M. Dejean, qui, daus son Catalogue, en enuniere 30 [sic] especes, dont 26 appartiennent k I'Amerique, 3 & I'Afriqiie australe et une a I'Asie. Nous citerons, parrai les premieres, les D. glahrata, conjugata, caroliniana et collaris (altica) de Fabricius, 5-lincata, 6-Uneata d'Olivier, et Jf-vittata d'lUiger. Les insectes qui composent sont moyeune grandeur presque tons ont les elytres noires avec ce g. de ; des lignes longitudinales jauues ; leurs tibias sont terniinfe ext^rieurement par deux ongles excessivenient petits. Of the original 31 species listed in the Dejean Catalogue, at least 6 of the North and South American species had been previously described, possibly more. Of these, only four are now considered as belonging to the genus Dhonycha. Galleruca coUaris Fabricius ^ is not recognizable, and Haltica quadrivittata Illiger * was listed b}'^ Illiger under the group Oedipodes. The remainder are : Crioceris caroliniana Fabricius,^ C. gJahnita Fabricius,*' C. collata Fabricius,'' and Haltica conjuncta Germar.^ Since no previous designation seems to have been made, Crioceris collata^ the most definitely de- scribed of the North American species included by Chevrolat (in Dejean), is hereby designated as the type of the genus.
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