Collembola 9 A 



slanting backward; absent on the anterior and posterior regions of the inter- 

 mediate body segments; (2) fewer setae, suberect or curving forward; Ci) long 

 slender outstanding sensory setae. Length, 1.5 nun. 



The specimens collected by the Expedition agree with my Kuropean exam- 

 ples of the species. 



Folsomia quadrioculata occurs on damp ground under stone*, wood or fallen 

 leaves, in humus and in moss, under loose bark, in flower pots, and on tin- 

 shore under driftwood, stones or seaweed. The sperie> is easily rerogni/ed by 

 its broad body, characteristic dirty grey colour and slow movements. When 

 disturbed it springs actively, in spite of its short furcula. In Finland it winter- 

 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 - Lin- 

 naniemi, '12). 



This species, one of the commonest coljembolans in northern and middle 

 Europe, has been reported from the following Arctic localities: Nova Zombla. 

 Spitzbergen, King Charles land, White island, Hoar island, .Ian Mayen and 

 Greenland. 



From Canada, I have received specimens recently from Mr. Charles Mac- 

 namara, taken by him in dead leaves, October, 1917, at Arnprior, Ont. 



In the United States, the species has been recorded from Minnesota by 

 Guthrie, some of whose specimens I have studied through the courtesy of Prof. 

 Henry F. Nachtrieb. 



Bernard harbour, Northwest Territories, on the surface of a pond, June 

 18, 1915 (2 specimens), July 9, 1915 (1 specimen). F. Johansen. 



Isotoma viridis Bourlet. 



Plate 6, figs. 48-52. 



Isotoma viridis Bourlet, 1839. Gervais, 1844. Nicolet, 1847. Lubbock, 

 1873. Parona, 1879, 1883. Schott, 1891, 1894, 1902. Dalla Torre, 1895. 

 Reuter, 1895. Lie-Pettersen, 1896, 1898, 1907. MacGillivray, 1896. Meinert, 

 1896 Schaffer, 1896, 1900a, 1900b. Poppe and Schaffer, 1897. Scherbakov, 

 1898a, 1898b, 1899a. Carl, 1899, 1901. Absolon, 1900. Carpenter and 

 Evans, 1899. Evans, 1901a, 1901b Wahlgren, 1899a, 1899b, 1900a, 1900b, 

 1906a, 1906b, 1907, 1909. Kieffer, 1900. Skorikow, 1900. Willem, 1900. 

 Borner, 1901a, 1903, 1906. Folsom, 1902. Krausbauer, 1902. Voigts, 1902. 

 Agren, 1903, 1904. Axelson, 1903, 1904, 1905a, 1906. (Axelson) Linnaniemi, 

 1907, 1909, 1911, 1912. Guthrie, 1903. Carpenter, 1907. Collinge, 1910. 

 Collinge and Shoebotham, 1910. Shoebotham, 1914. 



Isotoma caerulea Rourlet, 1839. Gervais, 1844. 



Desoria virescens* Nicolet, 1841. Gervais, 1844. 



Desoria cylindrica Nicolet, 1841. Gervais, 1844. 



Desoria viatica Nicolet, 1841. Gervais, 1844. 



Desoria pallida Nicolet, 1841. Gervais, 1844. 



Desoria ebriosa Nicolet, 1841. Gervais, 1844. 



Desoria annulata Nicolet, 1841. Gervais, 1844. 



Podura viridis Bourlet, 1843. 



Podura annulata Bourlet, 1843. 



Heterotoma chlorata Gervais, 1844. 



Isotoma Desmarestii Gervais, 1844. 



Isotoma virescens Nicolet, 1847. 



Isotoma cylindrica Nicolet, 1847. 



Isotoma viatica Nicolet, 1847. 



Isotoma ebriosa Nicolet, 1847. 



Isotoma annulata Nicolet, 1847. Lubbock, 1873. Parona, 1883. 



Isotoma anglicana Lubbock, 1862, 1873 



