_Cephalothorax_: As long as it is broad, sides evenly convex, upper margin straight, one distinct median suture; no eye spots; surface of cephalothorax very granular. [Illustration: Figure 4. _Ideoroncus obscurus_ Banks. Forward part of the animal from above. ×25.] _Abdomen_: Badly curled up; scuta entirely covered with short almost clavate hairs. The naming of this species is based on the short "saw-like" hairs that are all over the body. They are not globular on the end, as the clavate hairs, but have "saw-like" edge. _Palps_: Short and stout, coxa smooth, trochanter as usual, femur shorter than cephalothorax; pedicellate, inner margin almost straight at base, then suddenly concave to tip, outer margin evenly but not strongly convex; tibia broad, pedicellate, suddenly enlarging on inner side near base, outer margin evenly convex. Trochanter, femur, tibia strongly granulate and sparsely covered with these "saw-like" hairs. _Hand_: Broad as it is long, greatly swollen on inner margin near base; fingers slightly curved and as long as the hand. _Mandibles_: Small; spinnerets small and transparent; serrula attached throughout the length of the moveable finger. _Legs_: The two anterior legs with trochantins; legs covered with many hairs. This specimen was found on the window pane of the Pomona College greenhouse. A fly (_Musca domestica_) lit on the pane and the pseudoscorpion caught its legs and clung while the fly crawled about. This is the only one of its kind that has been found. _Atemnus hirsutus_ Banks Described by Banks in this number of the Journal. Only one specimen of this species was taken. This is the species found nearest the ocean. The broad hand is quite evident. Found ten feet from the ocean, among stones, at Laguna Beach. _Obisium macilentum_ Simon _Description_: Pale yellowish brown, legs paler; hard part shining; cephalothorax one-fourth longer than broad. Sides parallel; mandibles about one-half the length of the cephalothorax; pedipalps very long and slender, with long, fine, scattered hairs. Femur as long as the cephalothorax. Fingers longer than hand. _Habitat_: Claremont. _Ideobisium threveneti_ Simon _Description_: Length of animal, including mandibles, 4 mm.; length of palps, 3.5 mm.; length of abdomen, 3 mm.; length of claw, 1.5 mm. Color--Cephalothorax and palps, dark reddish brown; abdomen, lighter than cephalothorax; legs, pale yellow. _Cephalothorax_: As long as it is broad, upper margin truncate, sides nearly straight, lower margin straight; no suture; four distinct eye spots; eyes on each side almost touch each other. _Abdomen_: Elongate, three times as long as it is broad; scuta entire. _Palps_: Coxa smooth; trochanter small; femur long, outer edge almost straight, inner edge slightly convex; tibia short and stout, pedicellate, convex on inner and outer surface. _Claw_: Not large; finger as long as hand and not curved very much; hand, broad, evenly convex on inner and outer edges.