Tail lengths of live J2 were measured in two, three, and eight populations of Tylenchulus graminis, T. palustris and female T. semipenetrans, respectively. Except for one population of T. palustris from Costa Rica and two populations of female T. semipenetrans from Italy, all other populations were from Florida, U.S.A. Ranges in tail length values were 59.5-72.5, 42.0-54.0, and 55.0-70.0 m for T. graminis, T. palustris, and female T. semipenetrans J2, respectively. The canonical discriminant analysis for this character allows the separation of T. palustris J2 from T. graminis and female T. semipenetrans J2, which did not differ. The nearly hyaline portion of the posterior body without fat globules 2 m diam was measured in selected populations of T. graminis, T. palustris, and female T semipenetrans J2 from Florida. The ranges in values for this class of measurements were 59.0-75.0, 24.5-59.0, and 35.0-60.0 m for each of the three species, respectively. Another class of measurements
