41 6 The Ohio Naturalist. [Vol. VI, No. 2, 



The following observations by J. Barrois (IV) upon a clielifer 

 living in the temperate zone are interesting, and show that 

 females may build nests, but evidently for themselves and not 

 for the brood. This chelifer was found in small closed nests 

 under rocks. Only the females built the nests. The males hid 

 as best they could and were smaller and fewer than the females. 

 Between October and February the occupants were plump with 

 swollen abdomens. By the end of April or May the nests were 

 empty or contained only an emaciated female. The eggs were 

 not laid before January, but after that they were found in a 

 packet adhering to the vulva, with the cavity of the packet in 

 free communication with the oviduct, evidently a nutritive 

 adaptation. Here we see how the female uses a nest for another 

 purpose. In the tropics where my observations were made, 

 such an adaptation would hardly be necessary and I do not 

 think that it exists. 



Moulting. — I made no observation indicating the number of 

 times pseudoscorpions moult. That they moult after becoming 

 sexually mature is probable from the fact that the normal gen- 

 ital openings appear when they are about three-fourths grown 

 and that they produce eggs at that stage. Smaller animals 

 show no signs of genital openings. Then again, a case of regen- 

 eration of a pedipalp (descr. below) indicates that mature ani- 

 mals probably moult even when apparently full grown. In 

 arthropods generally the enlargement of a regenerating organ 

 takes place at moulting time, in fact regeneration presupposes 

 moulting, and if the same rule holds true for pseudoscorpions, 

 it suggests that older specimens may moult. (See, however, 

 Moulting Nests.) 



The manner of moulting is as follows: The dorsal skin of 

 the cephalothorax splits at the anterior and lateral margins, 

 remaining hinged posteriorly. The animal then extricates it- 

 self through this opening. This is the situation indicated by 

 the exuviae examined, in which this skin exists as a hinged lid. 



Regeneration. — I found a few specimens that had lost one to 

 several segments of the pedipalps, and one specimen with a 

 large (normal) pedipalp and a small one of about half the nor- 

 mal size. The smaller pedipalp was of lighter color and thin, 

 and in every way suggested a case of regeneration similar to that 

 found in crabs. 



Body Movements, Light or Heat. — A pseudoscorpion can 

 retract one or both of its chelicerae and move them in any 

 direction. The pedipalps can be moved in any direction and 

 the trochanter and femur folded back almost against the sides 

 of the body, the tibia and the chelae, or hand, extending for- 

 ward. It cleans the chelae of its pedipalps with its chelicerae, 

 or mandibles, using them either singly or as a pair. The legs 

 are used in pairs when walking, and those of each side constitute 



