432 
PACIFIC SCIENCE, VoL XI, October, 1957 
Figs. 99-102. Johnstoniana latiscuta n. sp., larva: 99, tarsus I, anterior; 100, tarsus II, anterior; 101, coxa III; 
102, tarsus III. 
companion seta at 0.70V, and a shorter one at 
0.88 pv. Tarsus II with short, spikelike famu- 
lus 2 at 0.5 Opd, a clavate, carinate solenidion 2 
at 0.59 pd, and a rather straight eupathid at 
0.8 Apv. Tarsus III with no specialized setae. 
Anterior and posterior claws on all legs with 
a sharp spine at the basal third of the concave 
side; anterior claw gently curved throughout 
length, posterior claw sharply bent just be- 
yond the spine. 
type locality: At origin of King’s Creek, 
Lassen Volcanic Park, California, August 6, 
1955 (holotype female). Collected by the 
writer. Type in author’s collection. 
remarks: The correlation of the female 
with the larva described above must be re- 
garded as tentative, although it is almost cer- 
tain that they belong to the same species. The 
two specimens were found within about a 
foot of each other under rocks on the edge 
of the stream. There is no question about 
their generic identity. 
It is not possible to compare this species 
with other presently described forms because 
of the inadequacies of the description of the 
latter. However, it is probable that detailed 
comparisons would prove it distinct. 
Johnstoniana vitzthumi Womersley 1939 
While it is apparent from the original fig- 
ures and description that this species belongs 
in the Johnstonianidae, it is impossible to 
compare it reliably with other members of the 
family, or even to ascertain that it is truly a 
Johnstoniana . The description was based on a 
single specimen collected in South Australia. 
Diplothromhium Berlese 1910 
ADULT: Fairly large mites, idiosoma usually 
between 1,000 and 2,000 /jl long, color in life 
dark reddish-brown. Scutum elongate, nar- 
row, bearing an anterior spine, and well- 
differentiated anterior and posterior areae sen- 
silligerae (Figs. 110, 160). Two pairs of 
smooth, slender sensilla, and usually two 
pairs of shorter normal setae in the posterior 
area sensilligera. Dorsum of propodosoma 
with a few to many setae borne on individual 
