Pomona College Journal of Entomology 845 



Mucrones of /. minima (Guthrie) (E) have "the distal tooth almost straight, 

 the ante-distal tooth close to, and at rif,'ht angles to it; proximal tooth 

 smaller and set about the middle of the muerone pointing slightly distal- 

 wards." The muerone resembles those of /. minor (Sehaff) ; the distal tooth 

 is the same, the second and third are in the same position l)ut only one of 

 them is vertical, the other is almost horizontal. 



Habitat — Polaris Bay in the Arctic regions. Spitzhergen, Ma.s.sachusetts 

 Bay, and Cold Spring Beach. 



Important References 



1895 Macgillivray, Alex. U. The American Species of Lsotoma. Cau- 



adian Entomologist, Vol. 28, p. 47. 

 '[WYA Davenport, C. B. The Collembola of Cold Spring Beaeh with 



Special Reference to the Movements of the Poduridtt. 

 1903 Guthrie, Joseph E. The Collembola of Minnesota. 

 IflOT Linnaniem, Walter JI. Die Apterygotenfauna Finlando. /. ^4//- 



gemeiner Teil. 



1910 Collinge, Walter E. and Shoebotham, John W. The Apterygota 

 of Hertfordshire. The Journal of Economic Biology... Vol. 5, 

 p. 95. 



