Region 2 Other Emphasis Species List Lined Snake (Tropidoclonion lineatum) Recommendation Rationale: Not R2 SS, But Should Be Considered For Other Emphasis Species Lists This prairie species is considered secure within the heart of its range, including eastern Nebraska (could extend to Samuel R. McKelvie and Halsey units) and Kansas. Its imperiled ranking in South Dakota is no doubt due to its very limited distribution in the extreme southeast corner of the state. In Colorado, the species has been found in the Denver-Boulder area, out into the central and southeastern plains. Because of its secretive habits, it is anticipated that it may be even more widely spread in eastern Colorado. It is known from the Comanche National Grasslands and could ultimately be found on or near the Pawnee. While populations may have suffered along the rapidly developing Front Range in Colorado, and as a consequence of riparian habitat degradation, the species seems generally tolerant of habitat modification, and remains at least locally common. Consequently, at this time we see no compelling reason to put on the list. However, the species has several life history characteristics that could put it at risk. Therefore, we recommend that the status of the species be monitored by our Plains units and treated as a species of local management concern where problems are identified. Note: In addition to the evaluator’s references, also referred to biodiversity documentation at Natureserve.org; Wyoming Biodiversity Node; distribution data from the Colorado Herpetological Society; Hammerson 1999; Reptiles and Amphibians of Nebraska, 2000, Coop. Unit, Univ. Neb; Collins and Collins (1991) Reptiles and Amphibians of the Cimarron National Grasslands, Morton County, Kansas; Collins Revised on January 29, 2003 by Gary Patton .