Johnstonianidae — Newell 
46$ 
Figs. 255-261. Lassenia scutellata n. sp., larva: 255, tarsus I, posterior; 256, famulusj, tarsus I; 257, vestigial 
seta, tibia I; 258, tarsus II, posterior; 259, organism of unknown nature attached to seta at base of femur I; 260, 
tarsus III; 261, chelicera. 
Polydiscia Methlagl 1928 
The resemblance between the larva of Poly- 
discia squamata Methlagl 1928 and that of 
Lassenia scutellata n. sp. is so close as to leave 
little doubt of the very close relationship be- 
tween Polydiscia and Lassenia. The genus must 
therefore be removed to the Johnstonianidae. 
Thor and Willmann (1947, p. $42) placed the 
genus in the Trombiculinae, Radford (1950, 
p. 99) placed it in the Microtrombidiinae, and 
Baker and Wharton (1952, p. 251, Polydisca , 
sic) listed it with the Trombidiidae whose sub- 
familial relationships are unknown. 
