| Publication Type: | Journal Article |
| Year of Publication: | 1950 |
| Authors: | L. Vargas, Downs W. G. |
| Journal: | Revista de la Sociedad Mexicana de Historia Natural |
| Volume: | 11 |
| Pagination: | 161–172, 5 pls |
| Publication Type: | Journal Article |
| Year of Publication: | 1950 |
| Authors: | L. Vargas, Downs W. G. |
| Journal: | Revista de la Sociedad Mexicana de Historia Natural |
| Volume: | 11 |
| Pagination: | 161–172, 5 pls |