PSYCHE 
Vol. 58 December, 1951 No. 4 
NOTES ON ALASKAN COLLEMBOLA 
II. THREE NEW SPECIES OF ARCTIC COLLEMBOLA 1 
By Kenneth A. Christiansen 
American University, Beirut 
This is the second in a series of papers on the Collembola 
fauna of northern Alaska. The material on which this 
paper is based was collected by Dr. Neal A. Weber while 
holding a contract with the Office of Naval Research and 
while stationed in the Alaskan Arctic under the support of 
the Arctic Research Laboratory. 
I wish to thank Dr. Marie Hammer and Dr. Harlow B. 
Mills for their helpful suggestions concerning this work. 
Schaefferia variabilis, n. sp. 
(PI. 10, figs. 1-11; PI. 11 figs. 2, 6, 7) 
Holotype . Eyes two on either side, pigmented and sit- 
uated on a lightly pigmented eyespot. No other pigment 
present. Integument granulate with granulations uniform 
and moderate in size. Clothing of long, sturdy, straight 
to slightly curved, and mostly sparsely “ciliate” setae, with 
scattered smaller curved or straight naked setae. The 
longer setae on the last three abdominal segments are 
somewhat longer than those on the remainder of the body. 
Antennal segments one through three subequal in width, 
fourth antennal segment slightly narrower than the third 
at its base and tapering gently to a blunt point. Antennal 
segments one through three subequal in length, with the 
fourth being about one and one-half times as long as the 
third. Fourth antennal segment with a simple distinct 
apical, retractile bulb, protected on the ventro-external side 
by an erect papilla. Dorsally there are many long, mostly 
straight smooth setae, and five thick blunt, curved 
“olfactory” setae. Ventrally there are present also a number 
1 Published with a grant from the Museum of Comparative Zoology 
at Harvard College. 
125 
