COLLEMBOLA OF THE FAMILY ISOTOMIDAE 81 



Minnesota: St. Louis County, July 6, 30, J. E. Guthrie (University of Minne- 

 sota). 



Florida: Alachua County, March 20, T. H. Hubbe!!. Camp Torreya, Liberty 

 County, April 3, T. H. Hubbell. Marion County, February 20, in moss, 

 T. H. Hubbell. Putnam County, March 19, T. H. Hubbell. 



Louisiana: Tallulah, April 9, 25, May 3. 



Canada: Arnprior, Ontario, April, October, C. Macnamara. 



Subgenus Vertagopus Borner 

 Vertagopus Borner, 1906, p. 171. — Linnaniemi, 1912, p. 138. 

 Suhgenotype. — Isotoma cinerea (Nicolet). 



KEY TO SPECIES OF SUBGENUS VERTAGOPUS 



1. Furcula extending almost or ciuite to the ventral tube. Mucro, 

 in lateral aspect, v/ith strongly curving ventral contour. Ej^es 

 unequal. Blackish or purplish; appendages white or 

 yellowish arborea (p. 83) 



Furcula extending only as far as the posterior border of the 

 second abdominal segment. Mucro, in lateral aspect, with 

 ventral contour feebly curving or almost straight. Eyes equal. 

 Variable in coloration: Yellowish, bluish, or greenish cinerea (p. 81) 



ISOTOMA (VERTAGOPUS) CINEREA (Nicolet) 



Plate 27, Figures 300-308 



Desoria cinerea Nicolet, 1841, p. 60. — Gervais, 1844, p. 429. 



Isotoma cinerea Nicolet, 1847, p. 372. — Tullberg, 1872, p. 47. — Lubbock, 1873, 

 p. 174.— Parona, 1879, p. 602; 1882, p. 463.— Tomosvary, 1882, p. 124.— von 

 Dalla Torre, 1888, p. 157; 1895, p. 10.— Uzel, 1890, p. 66.— Schott, 1894, 

 p. 73; 1902, p. 28.— Reuter, 1895, p. 28.— Lie-Pettersen, 1896, p. 18.— 

 Carl, 1899, p. 320. — Carpenter and Evans, 1899, p. 251. — Schaffer, 

 1900a, p. 247; 1900b, p. 260.— Borner, 1901a, p. 58.— Evans, 1901b, p. 

 153.— Agren, 1903, p. 142; 1904, p. 17.— Axelson, 1904, p. 70; 1905b, p. 

 32; 1906, p. 13.— Wahlgren, 1906a, p. 223; 1906b, p. 257; 1919, p. 745.— 

 Linnaniemi (Axelson), 1907, p. 21; 1909, p. 13; 1911, p. 15. — Collinge and 

 Shoebotham, 1910, p. 108. — Bartholin, 1916, p. 168. — Brown, 1918, p. 186. 



Isotoma quadri-denticulata Tullberg, 1871, p. 152. 



Isotoma unica MacGillivray, 1896, p. 50. 



Isotoma dilatata MacGillivray, 1896, p. 53. 



Isotoma inclinata MacGillivray, 1896, p. 55. 



Isotoma lateraria MacGillivray, 1896, p. 56. 



Isotoma (Vertagopus) cinerea Borner, 1906, p. 171. — Collinge, 1910, p. 9. — 

 Linnaniemi, 1912, p. 139.— Denis, 1921, p. 125; 1922a, p. Ill; 1924d, p. 

 210.— Stach, 1921, p. 161.— Handschin, 1924a, p. 113; 1929, p. 64.— Wo- 

 mersley, 1924a, p. 32; 1925, p. 219. 



Vertagopus cinerea Handschin, 1924b, p. 85. 



Description. — General color yellow, olivaceous, grayish, or bluish, 

 according to the amount of blue pigment present; in alcohol, often 

 greenish, the combined effect of the yellow ground color and minute 

 spots of blue pigm.ent. Body segments frequently edged with dark 

 blue. In heavily pigmented individuals a median dorsal interrupted 

 blackish stripe may be present; or there may be three dorsal stripes. 



