NO. 2134. NORTH AMERICAN COLLEMBOLOUS INSECTS— FOLSOM. 483 



as the ungues, curving, on large contiguous papillae. Clothing (fig. 

 33) of many stout surving serrate setae of moderate length and fewer 

 long stiff capitate setae, more or less serrate. Maximum length, 

 2.5 mm. 



This is the species that Packard rcdescribod as rdvicolo. Fitch, 

 Packard's specimens are not in the Museum of Comparative Zoology, 

 with the rest of his Essex County material, but I have his original 

 drawings, which leave no doubt as to what species he regarded as 

 nivicola. Harvey and Lintnor depended upon Packard's account of 

 nivicola, and the specimens to which they applied that name are, 

 indeed, the same species that Packard had in hand; tliis I have 

 learned from an examination of the identical specimens that Harvey 

 and Lintner used in preparing the papers mentioned above in the 

 synonymy. 



This species is frequently found on red maple trees, crawling on 

 the trunk or remaining under the bark or in crevices, especially about 

 the base of a tree. I have occasionally found it under the loose 

 bark of pine, oak, and apple trees, or about the roots; or clustered 

 under moss on a stone. In Massachusetts full-grown individuals occur 

 from mid- April until the middle of June; a second brood begins to 

 appear late in June and has disappeared by the last of August. I 

 have twice (April 22, 29) found abundant eggs of this species under the 

 loose moist bark of red maple roots, protected by the sod; they 

 were pale yellow, spherical, 135 micra in diameter, in irregular 

 masses, and hatched in a httle less than one month. 



Maine. — Orono, February, March 10, 15, May, F. L. Harvey. 



Massachusetts. — Cambridge, April 17, 22, 29, May 2, 4, June 11. 

 Arlington, April 17. Lexington, May 10, 11. 



New York. — Ithaca, January 30, J. H. Comstock; Februar}^ 24, 

 A. D. MacGiUivray. Stockport, April 18, Mrs. J. A. Lathrop. 

 Ghent, April 13, E.' C. Powell (N. Y. State Coll.). Mousey, March 

 21, H.Glasgow. 



Pennsylvania. — Harrisburg, March 23, H. A. Surface. 



Maryland.— Newark, January 24, Beckwith (N. Y. State CoU.). 



Ohio. — Salem, March 21, A. D. MacGiUivray. 



Illinois. — Urbana, April 9, 11, 25. Lagrange, November 6, J. J. 

 Davis. 



Canada. — Toronto, Ontario, June 26, R. J. Crew. 



ACHORUTES PACKARDI Folsom, var. DENTATUS Folsom. 

 Plate 10, figs. 34-41. 



Achorutes packardi, var. dcntatus Folsom, 1902a. 



Achorutes lapponicus Axelson, 1902. 



Hypogastrura lapponica (Axelson) Linnaniemi, 1912. 



In this variety all the ungues (fig. 34) are unidentate; the mu- 

 crones are one-fourth as long as the dentes, and in form as in figures 



