4o8 The Ohio Naturalist. [Vol. VI, No. 2, 



Fla., Sand Point, Fla., Retreat, N. C, Fredericksburg, Va., and 

 Detroit, Mich. (To this Ust can now be added Port Antonio, 

 Jamaica, and Georgesville, Ohio.) ; for C. pemisylvanicus, Pough- 

 kepsie, N. Y., and Lake Poinsett, Fla. I read over carefully the 

 list named by Mr. Banks in his paper (III) above quoted, for the 

 purpose of noting the distribution north and south, and east and 

 west. I have concluded from this that there are distinct eastern 

 and western species, but probably only a few distinct northern 

 and southern species. Thus Pacific Coast species are reported 

 no farther east than Utah, Montana and Wyoming, while eastern 

 species are reported no farther west than Texas, Kentucky, and 

 Michigan. Obisiuni Brunnerium, Hagen, common in the east, 

 is reported from Utah, but Mr. Banks seems to have some doubt 

 in this case that the Utah species is the same. Chelijer can- 

 croides, Linn., Faun. Suec, is of course reported from the Pacific 

 Coast and perhaps occurs over the whole U.S., and if not now, 

 will very likely soon occur throughout the entire world. Two 

 or three species are reported only from Texas and Colorado. 

 Eastern and Pacific Coast species, on the other hand, generally 

 have a wide north and south distribution. Thus among other 

 eastern species named by Mr. Banks, Chelijer hiseriatum, Bks., 

 reported only from Lake Poinsett, Fla., was found by myself 

 under a neglected carpet infested with buffalo moths, at Berea, 

 Ohio, in 1901. The two species collected in Jamaica also illus- 

 trate this far north and south distribution nicely, extending 

 even to within the tropics. 



This wide north and south distribution of the species of 

 pseudoscorpions versus their rather limited east and west distri- 

 bution, I believe is associated with the migration of insects or 

 birds. Pseudoscorpions have, however, to my knowledge, 

 never been found upon birds, so that nothing definite can be 

 stated in this respect. On the other hand, they are known to 

 cling to insects (chiefly flies and beetles) and arachnids (see 

 Associations with Insects) and to be transported from 

 place to place by these. Certain insects are known to migrate 

 for hundreds of miles. Thus a moth, the Black Witch, Erebus 

 odora, is supposed to migrate from the West Indies and Mexico 

 to the U. S., while the Monarch, Anosia plexippus, is believed 

 to migrate south in fall and north in Spring. No doubt there 

 are other migratory insects, so that the distribution of pseu- 

 doscorpions will, I believe, sometime find its explanation in 

 this direction. There being nothing like a complete list of 

 pseudoscoripons in existence, it is evident that these speculations 

 are somewhat tentative. 



I tried to gain some idea of the distribution in South America 

 bv comparing the i)apers of Ellingsen (VIII), Balsan (I) and 

 Banks (III). I found no species mentioned that are common to 



