Jameson's mamba  Jameson's mamba ("Dendroaspis jamesoni") is a species of quick, highly arboreal and highly venomous snake of the family Elapidae. The species is endemic to Africa. Jameson's mamba was first described in 1843 by Thomas Traill, a physician, doctor, zoologist and scholar of medical jurisprudence. In 1936, in addition to the nominotypical subspecies "D. jamesoni jamesoni", Arthur Loveridge described a new subspecies "D. jamesoni kaimosae"; the latter is commonly referred to as the eastern Jameson's mamba or the black-tailed Jameson's mamba. The origins of the specific name, "jamesoni", are not fully understood, but it is possible that Traill named the species in honour of Robert Jameson (1774–1854), who was a contemporary of Traill's and was the Regius Professor of Natural History at Edinburgh University where Traill studied. Also, Traill was a member of the Wernerian Natural History Society, which was founded by Jameson. The subspecies "D. jamesoni kaimosae" takes its subspecific name from the type locality, the Kaimosi Forest in western Kenya. Analysis of the components of the venom of all mambas places Jameson's mamba as sister species to the western green mamba. Jameson's mamba is a large, slender elapid snake with smooth scales and a long tapering tail which typically accounts for 20 to 25% of its total length. The average total length (including tail) of an adult snake is approximately to . It may grow as large as . Adults tend to be dull green across the back, blending to pale green towards the underbelly with scales generally edged with black. The ventral side, neck and throat are typically cream or yellowish in colour. Jameson's mamba has a narrow and elongated head containing a small eye and round pupil. Like the western green mamba, the neck may be flattened. The subspecies "D. jamesoni kaimosae", which is typically found in the eastern part of the species' range, features a black tail, while central and western examples typically have a pale green or yellow tail. No significant sexual dimorphism has been observed between male and female snakes. The head, body and tail scalation of the Jameson's mamba:  Jameson's mamba occurs mostly in Central Africa and West Africa, and in some parts of East Africa.