A. lancinii may attain a total length (including tail) of 48 cm (19 in), but most adults are around 30 cm (12 in) long. The head is not distinct from the neck. The eye is rather small, and the pupil is round. The body is cylindrical, and the tail is short. The dorsal scales are smooth, without apical pits, and are arranged in 17 rows throughout the length of the body.[2]
Kornacker, PM (1999). Checklist and key to the snakes of Venezuela: Lista sistemática y clave para las serpientes de Venezuela (in Spanish and English). Rheinbach, Germany: PaKo-Verlag. p. 64. ISBN978-3980624008.
Roze, JA (1961). "El género Atractus (Serpentes: Colubridae) en Venezuela". Acta Biologica Venezuelica (in Spanish). 3 (7): 103–119.
Señaris, J. Celsa; Padrón, Aristeguieta; Matilde, María; Rojas Gil, Haidy; Rojas-Runjaic, Fernando J.M. (2018). Guía ilustrada de los anfibios y reptiles del valle de Caracas, Venezuela (in Spanish). Caracas, Venezuela: Ediciones IVIC (Instituto Venezolano de Investigaciones Científicas). p. 348.