M.Sc. (Zoology) / The morphometric diagnostic species characteristics of Labronema are presented in tabular form to be used directly in the identification of species. The inclusion of tail drawings of each species facilitates recognition of the thirty four species of Labronema. A diagnostic method, whereby morphometric data from a nematode under diagnosis is compared to tabular data in a linear fashion, is introduced. A dichotomous key is also provided as an aid to go directly to a single species using gross and finite characteristics. A short review is given of the genus Tubixaba Monteiro & Lordello, 1980, and the decription presented of Tubixaba tswanorum n. sp. from Botswana. The new species is closely related to T. parva Pretorius, Kruger and Heyns, in print, from South Africa, but can be readily distinguished from T. parva in being a larger nematode with a longer stylet, the absence of criss-cross radiations in the cuticle, a relatively thicker outer cuticle layer, and a differently shaped tail.