26 BULLETIN 168, UNITED STATES NATIONAL MUSEUM 



58) of rather long stiff dense simple setae slanting backv/ard, becoming 

 longer toward the posterior part of the abdomen; abdominal segments 

 with long slender simple erect sensory setae. In addition, somic of 

 the largest individuals have a moderate number of erect setae con- 

 siderably shorter than the sensory setae; stout stiff setae occur on the 

 bases of the legs. Maximum length, 1.5 mm. 



Remarks. — This species varies in pigmentation, the amount of pig- 

 ment increasing, as a rule, with the size of the individual. Variety 

 ^^aZ^io^a Axelson (1905a, 1905b, 1912) is entirely white, except the black 

 eye spots. Variety anophthabna Linnaniemi (1912) is white, without 

 any pigment, even the ocular pigment being absent, though the 

 corneae are present. This variety, found originally in Norway and 

 northern Russia, and recorded from Greenland by Remy (1928), 

 occurred among examples of the typical form collected in Canada by 

 Charles Macnam^ara. 



One individual that I examined had the two eye spots on each 

 side, but after treatment with potassium hydroxide they failed to show 

 the posterior corneae. 



In some Canadian specimens each femur had a distal subsegment. 



Specimens from Illinois had slenderer dentes and mucrones than 

 those from Northwest Territories. 



Our examples of the species agree with ICuropean material received 

 from Schaffer. 



Folsomia quadrioculata occurs on damp ground under stones, wood, 

 or fallen leaves; in humus and in moss; under loose bark, in flower- 

 pots, on pools of fresh water, and on the seashore under driftwood, 

 seaweed, or stones. 



The species is easily recognized by its broad body, characteristic 

 dirty-gray color, and slow movements. When disturbed it springs 

 actively in spite of its short furcula. In Finland it winters full grown, 

 and comes to life now and then on mild days ; never appearing on the 

 snow, however, but remaining among leaves or in moss in the woods 

 (Linnaniemi, 1912). 



Distribution. — This species, one of the commonest collembolans in 

 northern and middle Europe, and known from Italy also, has been 

 reported from the following arctic localities: Nova Zembla, Sjits- 

 bergen. King Charles Island, White Island, Bear Island, Jan Mayen 

 Island, and Greenland. 



New York: Lakeville, November 13, E. A. Maynard. 

 Illinois: Homer, May 3, 11, July 5. Urbana, April 13. 

 Minnesota: Minneapolis, June 1, J. E. Guthrie (University of Minnesota). 

 Canada: Arnprior, Ontario, June 30, Septem})er, October, C. Macnamara. 

 Bernard Harbour, Northwest Territories, June IS, July 9, F. Johansen 

 (National Collection, Ottawa). 



