PSYCHE 
Vol. 67 
March-June, i960 
Nos. 1-2 
THE GENUS PSEUDOSINELLA (COLLEMBOLA, 
ENTOMOBRYIDAE) IN CAVES OF THE 
UNITED STATES 1 
By K. Christiansen 
Grinnell College, Grinnell, Iowa 
In 1934 Bonet listed two troglophile species of the genus Pseudo- 
sinelln, P. decipiens and P. sexoculata, from caves of the United 
States. In 1949 Delamare described two new troglobite species, P. 
hirsuta and P. spinosa, and placed them in a new genus Troglosinella. 
The present work is the result of the examination of more extensive 
collections from caves in the United States and has resulted in the 
addition of four more troglophile forms and the discovery of five new 
troglobite species. The work covered in this paper was made possible 
by a National Science Foundation Grant, No. G4563. Mr. Jerry 
Tecklin did much of the manual labor involved in preparation and 
he, Mr. James Hedges and Mr. George Darland, made a collecting 
trip through Missouri and northern Arkansas, recovering a good deal 
of critical material. Most of the remaining specimens were collected 
by Mr. and Mrs. Thomas Barr or Mr. Carl Krekeler. I wish to 
thank all of these people. 
Distribution 
Collections are relatively complete only from the region immediately 
around Tennessee and Kentucky; however, we have a sufficient scat- 
tering of material from other regions to be able to discern the probable 
outline of the distribution of the group. The species of this genus are 
more widespread in caves than those of the genus Sinella previously 
reported, but the troglobite forms are still largely limited to the 
southeast quadrant of the country. In the troglophile forms the ex- 
tensive invasion of the caves of Missouri and Arkansas is the most 
notable phenomenon. Generally speaking, the troglobite forms are 
severely restricted in distribution and, in cases of numerous collections, 
more or less continuous. The troglophile forms are much more wide- 
'Published with the aid of a grant from the Museum of Comparative 
Zoology at Harvard College. 
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Smivhsuiwkn 1 § i§g 
