Johnstonianidae — Newell 
415 
2b. Dorsal hysterosomal setae appreciably 
stouter and of more nearly uniform diam- 
eter throughout, reaching only a little 
beyond the margin of the setigerous 
sclerites (Fig. 64). 
3a. Ocular plates with only one distinct cor- 
nea, plus a non-refractile posterior lobe 
(Fig. 53). 
3b. Ocular plates with two distinct corneae. 
4a. Tarsus I with only two (exceptionally 1 
or 3) clavate solenidia 3 on posterior mem- 
brane of claw fossa (Fig. 48). 
4b. Tarsus I typically with more than two 
clavate solenidia here. 
5a. Famulus of tarsus II very close to alveolus 
of clavate solenidion 3 , removed from it by 
a distance no greater than the length of 
the solenidion, and with no other setal al- 
veoli in the intervening distance (Fig. 
49). 
5b. Famulus of tarsus II removed from al- 
veolus of clavate solenidion 3 by a dis- 
tance greater than the length of the 
solenidion; one or two normal setae in 
intervening distance (Figs. 6, 8). 
6. Range in idiosomal length, by sex, where 
known. 
Since the larva of only C. distans is known, 
no key to larvae can be given. The above key 
does not include all the characters of probable 
specific value in the genus, but they are the 
more important ones. Others include the 
difference in form of the posterior end of the 
scutum, which is important in differentiating 
C. distans and C. approximation, but this is 
difficult to state in words. WomersJey (1942, 
p. 171, fig. 2c) showed no anterior spine on 
the scutum of C. australasiae Womersley 1942. 
It is likely that this was drawn from an un- 
dissected specimen, and in such specimens the 
scutal spine often projects straight downward 
so that it cannot be seen in dorsal view. 
Whether or not this is the case in Womersley’s 
species is not known, but the possibility 
should certainly be kept in mind upon com- 
paring this with other species of the genus. 
Centro from bidium distans new species 
female: Idiosoma (Fig. 1) 897-988 \x long, 
702-728 /jl wide (two ovigerous specimens). 
Scutum (Fig. 4) drawn out into a long anterior 
spine, and with a single pair of capitate sen- 
silla, anterior to which is a pair of stout, long, 
smooth to faintly roughened setae; anterior 
sensilla absent. Crista metopica extending for 
most of length of scutum. Ocular plates very 
small, bearing only one prominent cornea 
(the anterior one) and an angular process 
(Fig. 25). Cuticle of ocular plate outside of 
cornea minutely tuberculate. Propodosoma 
between ocular plate and scutum with about 
seven setae, all of which lie at or anterior to 
the level of the sensilla. Dorsal and lateral 
body setae (Fig. 19) arising from alveoli borne 
on prominent raised sclerites, shaft sharply 
deflexed near base of seta. Membranous cuti- 
cle between sclerites with no visible markings 
except for a few faint parallel striae seen in 
some parts of the body. Subcuticular reticular 
layer a network of fine fibrils. 
Coxae I and II (Fig. 3) with only about 20 
to 25 smooth setae each; pars medialis coxae 
with about 5 setae; supracoxal seta absent. 
One small apodeme behind coxa II, very 
feebly developed. Coxae III and IV also with 
about 20 to 25 setae (Fig. 5). Ventral body 
setae like those of dorsal and lateral surfaces. 
Genital sclerites (Fig. 10) with 9 to 12 smooth 
l 
c 
b 
DISTRIBUTION OF VARIANTS 
2 
3 
4 
5 
6 
a 
a 
a 
b 
9 897- 988 /x 
distans n. sp. 
a 
a 
a 
a 
9 988-1092 ijl 
approximation n. sp. 
a 
a b 
a 
b 
9 962 M 
hadroseta n. sp. 
a 
b 
? 
? 
525 m 
schneideri Kramer 1896 
b? 
? 
? 
? 
800 /x 
misellum (Berl.) 1918 
? 
b 
b? 
p 
1020 n 
australasiae Worn. 1942 
