(1929) wrote that M. mexicanus (M. nummifer) will hang on and make half a dozen punctures unless quickly and forcibly removed. However, the effects of the venom include only transient pain and mild swelling. In one part of Honduras the locals even insist that the snake (M. nummifer) is not venomous. Laboratory studies suggest that Metlapilcoatlus venoms are unlikely to lead to consumption coagulopathy and incoagulable blood in humans. Species *) Not including the nominate subspecies. T) Type species. References Further reading March DDH. 1929. Notes on Bothrops nummifera, mano de piedra or timbo. Bulletin of the Antivenin Institute of America. 2(3): 58. Müller JW von. 1865. Vol. 3. Reisen in den Vereinigten Staten, Canada und Mexico. Beitrage zur geschichte, statistik und zoologie von Mexico. F.A. Brockhaus, Leipzig. xiv, pp. 595–619[613]. Rüppell E. 1845. Verzeichnis der in dem Museum der Senckenbergischen naturforschenden Gesellschaft aufgestellten Sammlungen. Dritte Abteilung: Amphibien. Museum Senckenbergianum 3: 293-318[313]. Werman SD. 1992. Phylogenetic relationships of Central and South American pitvipers of the genus Bothrops (sensu lato): cladistic analyses of biochemical and anatomical characters. pp. 21–40[21, 34]. In Campbell JA, Brodie Jr. ED. 1992. Biology of the Pitvipers. Texas: Selva. 467 pp. 17 plates. . External links Video: Herpetologist Austin Stevens shares his canteen with a jumping pit viper at Austin Stevens: Snakemaster. Accessed 2 November 2006. Snake genera