1947] 
Pseudoscorpions 
53 
one behind the other and with two or three very small 
accessory plates between; lateral plates snbequal to or 
smaller than the anterior median plate. 
Tritonympli. A single nymph, probably a tritonymph. 
Similar to the adult in general appearance and many de- 
tails ; appendages stouter and, especially the palpi, a little 
lighter in color; body 2.4 mm. long. Carapace 0.73 mm. 
long, 0.89 mm. wide across the posterior margin, ocular 
breadth about 0.45 mm. Chelicera much as in the adult; 
galea (Fig. 15) bifurcated at the very tip ; serrula exterior 
of 16 plates. Palpi in general as in the adult, except podo- 
meres somewhat smaller and stouter; femur 0.73 mm. 
long, 0.195 mm. wide ; tibia 0.53 mm. long, 0.23 mm. wide ; 
chela including pedicle 1.02 mm. in length, 0.30 mm. in 
width ; length of hand including pedicle 0.53 mm. ; movable 
linger 0.52 mm. long. Movable chelal finger with about 
25 marginal teeth; one tactile seta, probably t, located 
somewhat distal to the midpoint of the finger. Fixed 
chelal finger with about 35 marginal teeth ; six tactile setae 
present and distributed as follows : et about one-third of 
the finger length from the tip ; it on a level about one areo- 
lar diameter proximal to et; est located a little distal to 
the basal one-third of the finger; ist ( ?) and ib situated a 
little more than one-fifth of the finger length from the 
base of the finger and separated by less than one areolar 
diameter; a single exterior seta (probably eh) located 
near the base of the finger and considerably proximal to 
the level of ib. Legs similar to those of the adult but 
poclomeres smaller and somewhat stouter. 
Type locality. Australia. The female holotype from 
a collection taken on Rottnest Island, Western Australia, 
in December, 1931, by members of the Harvard Australian 
Expedition; the female paratype collected by Dr. P. J. 
Darlington at Cottesloe Beach, near Perth, Western Aus- 
tralia, on October 17, 1931 ; and the paratype nymph in 
a collection made by Dr. Darlington on October 24, 1931, 
at Rottnest Island, Western Australia. 
Remarks. Synsphyronus callus is unique among mem- 
bers of the genus by having a combination of one tactile 
seta on the movable chelal finger and seven tactile setae 
on the fixed chelal finger. 
