Johnstonianidae — Newell 
433 
sclerites between the scutum and ocular plates. 
Dorsal hysterosomal setae smooth, borne on 
individual elevated sclerites. Ocular plates 
protruding moderately, bicorneate. Coxa I 
lacking supracoxal setae; coxal ring of II 
complete dorsally, that of coxa I membranous 
dorsally. Intercoxal area with numerous 
smooth, slender setae, each borne on indi- 
vidual sclerites; pars medialis coxae well de- 
veloped. Genital and paragenital sclerites well 
developed, three pairs of genital acetabula. 
Anal sclerites crescentic, bearing a number of 
smooth setae. Rostrum apparently only with 
the protorostral and tritorostral setae, plus 
other setae behind these; deutorostrals absent. 
Trochanter of palp fenestrated anteriorly; tibia 
with one large terminal and one subterminal 
clawlike seta. Tarsus of palp with a single 
solenidion posteriorly, and a number of eu- 
pathidia in the distal half. Legs with solenidia 
of four fairly distinct types, s 2 being especially 
distinctive, clavate. Eupathidia present on all 
segments of all legs including and beyond the 
telofemur. Vestigial setae completely absent. 
larva: Scutum with two pairs of sensilla, 
the anterior pair very small; otherwise with 
two pairs of normal setae. Crista metopica 
well developed, anterior portion of scutum 
produced into a process of variable form. 
Ocular plates bicorneate. Dorsal and ventral 
surfaces of body covered with numerous seti- 
gerous sclerites. Coxal setae numbering 2- 
1-1 in known species. Intercoxal area with a 
single pair of setae between III; urpore pres- 
ent. Gnathosoma bearing only two pairs of 
setae, probably the protorostrals and trito- 
rostrals. Supracoxal setae absent on both the 
gnathosoma and on leg I. Podocephalic canals 
well developed. Anterior wall of trochanter of 
palp fenestrated. Palpal tarsus with a single 
solenidion near basal end; eupathidiform 
setae absent, although some of the terminal 
setae must be modified eupathidia. Solenidia 3 
present on telofemur of legs I to III; Si 
elongate, somewhat decumbent, s 2 stout, 
clavate. Tarsus II with only one eupathid. All 
legs with six free segments beyond the coxa, 
and two subequal tarsal claws. 
remarks: The larvae described here are the 
first described for the genus as a whole, and, 
of course, D. monoense is the first species in 
which the larva and adult are both known. 
Species of this genus are found in very moist 
situations and are cryptic in habits, avoiding 
direct sunlight as much as possible. Although 
experimental evidence is not yet available, 
they are evidently incapable of tolerating high 
temperatures for any length of time. The lar- 
vae are of the self-detaching type; they have 
been found parasitizing the pupae of aquatic 
beetles under wet rocks. 
Diplothrombium monoense n. sp. 
female: Idiosoma (Fig. 103) highly vari- 
able in size, 1,638 to 1,820 /jl long, 1,092 to 
1,326 /jl wide, length/width 1.43 to 1.52; 
average 1,706 by 1,180 /d, length/width 1.45 
(five ovigerous specimens). Scutum (Fig. 110) 
with two pairs of completely smooth sensilla, 
and between them a pair of stiff setae appear- 
ing hemipectinate under high magnification. 
Posterolateral to these is a second pair of setae 
contiguous with, but not fully enclosed by the 
scutum. Anterior end of scutum produced 
into a long blunt spine. Crista metopica well 
developed, extending from posterior margin 
of anterior area sensilligera to posterior end 
of scutum. Behind the posterior area sensilli- 
gera is a lateral expansion on either side of the 
crista metopica, bearing a number of coarse 
punctations. Ocular plates small, scarcely 
larger than the two corneae found on each 
side, strongly convex but not stalked, setae 
absent. Dorsal and marginal body setae (Fig. 
109) smooth, slender, tapering, typically with 
a sharp basal flexure. Alveoli borne on indi- 
vidual sclerites which are sharply elevated 
above the general surface of the cuticle in the 
form of a truncate cone. Propodosomal cuti- 
cle between the scutum and ocular plates and 
lateral to the ocular plates generally with 
