Collembola of the Canadian Arctic Expedition, 1913-18. 



By Justus W. Folsom 

 Of the University of Illinois. 



This is a report on the Collembola obtained by the Canadian Arctic Expe- 

 dition, 1913-16. The material, collected by Mr. V. Johansen, consisted of 

 numerous well-preserved specimens, in excellent condition for study, and com- 

 prised the following twelve species: — 



Podura aquatica L. 

 Achorutes tullbergi Schaf. 

 Achorutes sensilis, n. sp. 

 Achorutes armatus (Nic.) 

 Onychiurus duodecimpunctatus, n. sp. 

 Tetracanthella wahlgreni Axels. 

 Folsomia quadriocnlata (Tull.). 

 Isotoma viridis Bourl. 

 Isotoma palustris (Mull.). 

 Entomobrya comparata, n. sp. 

 Lepidocyrtus cyaneus Tull 

 Sminthurid'es aquaticus (Bourl.). 



The types and other specimens upon which this report is based are deposit* d 

 in the National Collection of Insects, Ottawa. 



Podura aquatica Linnaeus. 



Plate 1, figs. 1-3. 



Podura aquatica Linnaeus, -1758. — Nicolet, is 11. — Tullberg, L871, L872. 

 Lubbock, 1868, 1873.— Packard, 1873.— Parona, 1879, 1882. Dalla Torre, 

 1888, 1895.— Uzel, 1890.— MacGillivray, 1891.— Schott, L894, [902. Reuter, 

 1895— Schaffer, 1896, 1900a, 1900b. --Lie-Petterseri, 1896 Poppe and Schaffer, 

 1897.— Scherbakov, 1898b.— Carl, 1899, 1901. Wahl.men. lS99e, L906a. 

 Carpenter and Evans, 1899.— Absolon, 1900. L901. Willem, L900. Borner, 

 1901a.— Krausbauer, 1901.- Agren, L903.— Guthrie, L903. Axelson, 1906. 

 (Axelson) Linnaniemi, 1907, 1912. — Folsom, 1910. 



Hypogastrura aquatica Bourlet, L839. 

 Hydropodura aquatica Morner. L901b, L902. 

 Podura granulata MacGillivray, L893. 



Blackish blue; antennae and legs reddish brown; furcula pale brown. 

 Head hypognathous. Eyes 8 + 8. Ocular areas with conical elevations 

 between the eyes. Postantennal organs apparently absent, represented extern- 

 ally by minute rudiments. Antennae shorter than the head, stout, cylindrical, 

 with segments about as 4:5:6:7 in relative lengths. Olfactory hairs of fourth 

 antennal segment absent. Sense organ of third antenna) segmenl consisting of 

 a pair of short stiff seta'. Body short and -tout. A dorsal subsegmenl occurs 

 on the anterior part of each body segmenl excepl tin' ninth. Unguis ti-:. 1 

 very long, longer than the tibio-tarsus, slender, curving, unidentate behind the 



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