COLLEMBOLA OF THE FAMILY ISOTOMIDAE 113 



California: Claremont-Laguna region, G. A. Bacon. Palo Alto, V. L. Kellogg 



and L. M. Bremner (Stanford University). 

 Oregon: Corvallis, March 22, H. E. Ewing. 



ISOTOMA aSOTOMA) VIRIDIS Bourlet variety RIPARIA (Nicolet) 



Plate 37, Figure 434 



Desoria riparia Nicolet, 1841, p. 62. — Gervais, 1844, p. 430. 



Isotoma riparia Nicolet, 1847, p. 373. 



Isotoma palustris var. riparia Tullberg, 1871, p. 151. 



Isotoma belfragei Packard, 1873, p. 33 (part). 



Isotoma viridis var. aquatilis Schott, 1891b, p. 22. 



Isotoma viridis var. riparia Schott, 1894, p. 61. — von Dalla Torre, 1895, p. 

 10. — Reuter, 1895, p. 26.— Schaffer, 1896, p. 185; 1900a, p. 245.— Poppe 

 and Schaffer, 1897, p. 268. — Lie-Pettersen, 1898, p. 12.— Scherbakov, 

 1898a, p. 58; 1898b, p. 7.— Carl, 1899, p. 311.— Wahlgren, 1899a, p. 186; 

 1906a, p. 223; 1906b, p. 255. — Absolon, 1900a, p. 29.— Borner, 1901a, 

 p. 49.— Becker, 1902, p. 26.— Voigts, 1902, p. 523.— Agren, 1903, p. 134; 

 1904, p. 17.— AxELSON, 1903b, p. 5; 1905b, p. 34; 1906, p. 14.— Linnaniemi 

 (Axelson), 1907, p. 30; 1909, p. 11; 1911, p. 18; 1912, p. 163.— Brown, 

 1918, p. 186; 1926, p. 205.— Folsom, 1919a, p. 11. 



Description. — Ground color yellowish, greenisli, or brownish. The 

 principal characteristic of this variety is a dark blue or blackish 

 median dorsal stripe (pi. 37, fig. 434). Dark spots on the sides of the 

 body may or may not be present. Maximum length, 5 mm. 



Remarks. — This variety prefers humid situations, and is found 

 under damp wood, in moss, on the surface of fresh water, along the 

 shores of ponds or streams and on the seashore under seaweed, drift- 

 wood, or stones. 



Distribution. — Variety riparia ranges over northern and middle 

 Europe and has been recorded from Arctic Siberia and Mesopotamia. 



New Hampshire: White Mountains, Mrs. A. T. Slosson (Cornell University). 



New York: Ithaca, February 27, March 20, A. D. MacGillivray (Cornell Uni- 

 versity). Long Island, December 25, N. Banks (Cornell University), Mount 

 Mclntyre, July 1, M. D. Leonard (New York State Museum). 



Virginia: W, D. Richardson (Cornell University). 



Illinois: Champaign, November 29, M. W, Shackleford. 



Iowa: Ames, March 31, J. E. Guthrie. 



Texas: Waco, G. W. Belfrage (Museum of Comparative ZoologjO- 



Canada: Arnprior, Ontario, March 21, April 2, 9, C. Macnamara. Bernard 

 Harbour, Northwest Territories, May, F. Johansen (National Collection, 

 Ottawa) . 



ISOTOMA (ISOTOMA) VIRIDIS Bourlet variety CINCTA Tullberg 



Isotoma palustris var. cincta Tullberg, 1876, p. 35. 



Isotoma viridis var. cincta Schott, 1894, p. 62. — Schaffer, 1896, p. 185; 1900a, 



p. 246. — Linnaniemi, 1912, p. 164. 

 Isotoma glauca var. montana MacGillivray, 1896, p. 57. 



Description. — Ground color yellowish green, yellow, or white, with 

 a wide dark blue or blackish transverse band, mottled with the ground 

 color, on each segment. The intersegmental regions, being mostly 

 unpigmented, appear as pale bands. Length, 4 mm. 



