Charadracarus n. gen. — N ewell 
167 
there are four or five setae on either side, all of 
which are very faintly barbed. Anterior to the 
prosensilla, the scutum narrows to a sharp point 
which is so closely appressed to the dorsal sur- 
face of the propodosoma that it appears to be 
fused with it. However, the situation is probably 
the same in the adult as it is in the larva, in 
which the nasus is actually separate from the 
dorsal wall of the propodosoma. Between the 
areolae and extending to the small notch at the 
posterior margin of the scutum is a weakly de- 
fined crista metopica (Fig. 36) . The lateral 
margins of the scutum are indistinct, fading al- 
most imperceptibly into the very faintly striate 
membranous cuticle around it. Most of surface 
of scutum delicately punctate, region behind 
areolae with a number of faint panels. Dorsum 
of propodosoma with no setae lateral to scutum. 
Ocular plates completely absent. Dorsal and mar- 
ginal hysterosomal setae sparse, of two grades, 
arising from small and only slightly elevated 
setigerous sclerites, the alveolus lying in the an- 
terior half of the sclerite. Major setae with a 
strong tendency for the tip to be slightly en- 
larged and hollow, with a tuft of fine barbs; shaft 
sparsely barbed along one side. The minor setae 
arise from smaller setigerous sclerites, and their 
tips show no tendency toward enlargement. 
Membranous cuticle with striae visible only 
under the most favorable conditions. Coxae I 
with only six to eight setae; supracoxal setae 
absent. Coxae II with six setae each. Coxae III 
and IV with about ten and five setae each, re- 
spectively; coxal setae with four to eight long 
barbs. Coxal ring I scarcely closed dorsally, II 
completely open; III open, IV closed. Pars me- 
dialis coxae very faint, containing one or two 
setae on each side (Fig. 49); intercoxal area 
with only one or two setae. Other ventral setae 
with one to six fairly well-developed barbs. A 
broad transverse band of membranous cuticle 
behind coxae II devoid of setae. No trace of 
Lassenia-organ. Genital sclerites greatly reduced 
and difficult to see, containing only about eight 
smooth or sparsely barbed setae; paragenital 
sclerites totally absent. Between the genital 
sclerites lie the two pairs of acetabula. Genital 
opening considerably longer than the genital 
sclerite. Anus a very simple slit with no asso- 
ciated sclerites or setae, lying about half-way 
between the genital opening and the end of 
the hysterosoma. 
Base of gnathosoma (Fig. 49) with six setae 
on each side (two specimens). Velum simple, 
directed anteriorly, a small circlet of fimbriae 
near the center. 
Palpi (Fig. 43) five-segmented, trochanter a 
short ring, lacking a fenestra on the anterior 
surface. Femur with four setae, patella with two 
setae dorsally, tibia with six normal setae plus 
the heavy terminal odontus. Tarsus with the 
solenidion near the basal end, a series of three 
smooth dorsal setae (Figs. 44, 47), plus four 
other pectinate normal setae; terminal eupathid 
not hollow. Tip of tarsus drawn out into a nar- 
row bladelike point as in the larva of this and 
other genera of the Johnstonianidae. 
Femora I and II divided, III and IV undivided. 
Eupathidia confined to tarsi; vestigial setae ab- 
sent. Tarsus I (four examined) with a single 
Si at 0 . 63 — 0 .69*7 and typically with two S 2 be- 
tween 0.62 and 0.67. Famulus 1 at 0.74-0.76. 
About 20 eupathidia present, lying between 
0.57-0.60^ and 0.63-0.79^. Tarsus II (five ex- 
amined) with a single S 2 at 0.50-0.56*7, f 2 at 
0.37-0.52 d, and a single eupathid at 0.85-0.88p. 
Tarsi III and IV each with a single S 3 at 0.13— 
0.19. Other specialized setae as shown in table. 
All tarsi with two simple claws, the posterior 
one slightly larger and more erect than the 
anterior one. 
Chaetotaxy of legs approximately as shown in 
table (s = solenidia, e = eupathidia, f = fam- 
ulus, v = vestigial setae, n = normal setae ) . 
tr 
bf* 
tf* 
pa 
ti 
ta 
n 
n 
S3 
n 
S3 
V 
S 3 
Si 
Si 
So 
S 3 
Si 
e 
f 
I 
1 
4,5 
1 
9, 10 
5,6 
0 
2,3 
3 
1 
2, 1 
0 
7 
20 
1 
II 
1 
3 
0 
7 
2 
0 
1 
1 
0 
1 
0 
1, 2 
1 
1 
III 
2 
10 
2 
0 
2 
0 
0 
0 
1 
0 
0 
0 
IV 
3 
8 
2 
0 
2 
0 
0 
0 
1 
0 
0 
0 
Fused in legs III, IV only. 
