Johnstonianidae — Newell 
457 
smooth sensilla at or slightly behind the mid- 
dle of the plate and a pair of much shorter 
setae near the base of the spine. These are of 
the same general form as the other setae of 
the dorsum of the propodosoma, but their 
position and orientation indicate that they are 
the anterior sensilla. Their alveoli are indis- 
tinct and very small in contrast with those of 
the other dorsal propodosomal setae which 
are well formed. Limit of scutum indistinct 
in anterolateral portions where it is all but 
impossible to trace in undissected specimens. 
Crista metopica well developed up to a point 
about half way between the posterior and 
anterior pairs of sensilla. Ocular plates elon- 
gate, bearing two pairs of prominent corneae, 
the posterior of which are the larger. In addi- 
tion to the sensilla, the dorsum of the pro- 
podosoma bears 23 to 37 smooth, slender 
tapering setae on each side, 8 to 15 of which 
are definitely outside the scutum and 13 to 
20 are definitely inside the scutum; one to 
three setae near the anterolateral margins of 
the scutum of uncertain position. Dorsal hys- 
terosomal setae markedly different from those 
of the propodosoma, resembling those of 
Lassenia lasseni , stiff, rodlike, each borne on a 
small sclerite visible under high magnification 
(Fig. 246). The sclerites are not noticeably 
elevated. Membranous cuticle of hysterosoma 
completely smooth. 
Coxae I with 65 to 75 smooth setae each 
(Fig. 234) plus the short peglike supracoxal 
seta in the membranous portion of the dorsal 
surface of the coxa. Coxa II with 35 to 50 
setae; dorsal wall of distal part of coxa not 
sclerotized, but membranous like I. Both 
coxae I and II devoid of setae on their medial 
aspects. Intercoxal area with about 70 to 75 
long stiff setae arranged in a rather character- 
istic radiating pattern; pars medialis coxae 
completely absent. Behind the sclerotized 
part of coxa II is a single to triple row of 
setae like those on the coxae, behind which 
is the usual transverse band of membranous 
cuticle devoid of setae. The presence of setae 
in the membranous area directly behind coxa 
II, and the absence of the pars medialis coxae 
indicate a considerable reduction in the degree 
of sclerotization of the coxae of this species. 
While the specimen studied was not a com- 
pletely matured female, it seems probable that 
the conditions described above would be 
found in ovigerous females also. Coxae III 
with 30 to 36 setae, IV with 65 to 75 setae 
(Fig. 244). Genital sclerites moderately well 
developed but not of the strongly crescentic 
form found in Lassenia lasseni , bearing 21 or 
22 setae in a single to double row (Fig. 233). 
Paragenital sclerites very feebly developed, 
scarcely visible at low magnification, but at 
higher magnifications apparent as a slight 
change in texture of the cuticle; each sclerite 
bearing 12 to 15 setae. Anterior to the genital 
opening is the characteristic bulliform struc- 
ture found also in the type species of the 
genus, and just anterior to this is a very small, 
transverse sclerite. Three pairs of genital ace- 
tabula present. The ventral body setae sur- 
rounding the genital opening are largely 
oriented in the direction of the genital open- 
ing, while the setae on the genital and para- 
genital sclerites are mostly oriented in a more 
ventrad direction. Anus (Fig. 240) completely 
terminal, anal sclerites fairly well delimited, 
weakly crescentic, bearing 16 to 17 setae each. 
Ventral hysterosomal setae borne on minute 
sclerites; shaft of seta considerably more 
slender and tapering than in the case of the 
dorsal setae, the two types intergrading lat- 
erally. Ventral cuticle mostly smooth, with 
only scattered traces of striations. Two small 
apodemes in the transverse strip of cuticle 
behind each coxa II. No trace of the char- 
acteristic gland found anterior to coxae III 
in the adults of Lassenia lasseni was seen in 
this species, but the material was not en- 
tirely favorable for study of this feature. 
Base of gnathosoma (Fig. 248) totally de- 
void of setae, except for the supracoxals. 
Rostrum with four pairs of setae as shown 
in Figure 235. Deutorostral setae short and 
peglike, concealed behind the margin of the 
velum in ventral view. The lateral arms of the 
