98 BULLETIN 168, UNITED STATES NATIONAL MUSEUM 



cinerea (Nicolet) often occurs. Though belonging primarily to the 

 fauna of the cortex, leonina, like typical albella, may occur individually 

 in other situations, as under damp stones or wood, in moss, or on 

 pools of water. 



Distribution. — Recorded as follows: 



Maine: Orono, October, F. L. Harvey. 



Massachusetts: Arlington, January 16 (full grown), April 13, 23, May 1. 

 New York: Ithaca, A. D. MacGillivray (Museum of Comparative Zoology); 

 A. P. Morse. Macedon, April 13, J. D. Hood. Varna, March 27 (Cornell 



UniversitjO- 



Pennsylvania: Hazleton, May 29, 31, W. G. Dietz. 



Ohio: Yellow Springs, August 18. 



Illinois: Homer, March 31, April 27, May 16. Makanda, March 5, T. H. 

 Frison and H. H. Ross (Illinois State Natural History Survey). Mermet, 

 March 8, T. H. Frison and H. H. Ross (lUinois State Natural History 

 Survey). Urbana, March 18, 31, April 5, 12, May 3, August 11. 



Minnesota: J. E. Guthrie (University of Minnesota). 



Canada: Arnprior, Ontario, April 25, C. Macnamara. 



ISOTOMA (ISOTOMA) OLIVACEA Tullberg 



Plate 32, Figures 362-371 



Isotoma olivacea Tullberg, 1871, p. 151; 1872, p. 46. — Uzel, 1890, p. 64. — 

 ScHOTT, 1894, p. 68; 1896b, p. 116; 1902, p. 27.— Reuter, 1895, p. 27.— 

 Lie-Pettersen, 1896, p. 17. — Scherbakov, 1898a, p. 59; 1898b, p. 9. — 

 Wahlgren, 1900a, p. 367; 1906a, p. 225; 1906b, p. 256; 1919, p. 746.— 

 Borner, 1901a, p. 54.— Becker, 1902, p. 28.— Axelson, 1904, p. 74; 

 1905b, p. 32; 1906, p. 15.— Linnaniemi (Axelson), 1907, p. 30; 1909, p. 12; 

 1911, p. 16; 1912, p. 147.— ScHiLLE, 1906, p. 8.— Bartholin, 1916, p. 169.— 

 FoLsoM, 1919b, p. 279.— Stach, 1922a, p. 20.— Brown, 1923, p. 262.— 

 Remy, 1928, p. 64.— Handschin, 1929, p. 70. 



Description. — Olivaceous-greenish, in alcoholic specimens, as the 

 effect of a blue pigment with a yellowish ground color; or yellowish 

 brown. Head and body with many pale spots of the ground color. 

 Legs and furcula pale, or pigmented basally. Antennae pigmented 

 distally, paler proximally. Eyes (pi. 32, fig. 362) eight on each side, 

 subequal. Eye spots somewhat elongate, in length to width as 5:3. 

 Postantennal organ (pi. 32, fig. 362) elliptical, two and one-half times 

 as long as the diameter of an adjacent eye. Antennae longer than 

 the head (maximum, 1.5:1); third segment usually a httle shorter 

 than the second; occasionally equal to second or even a little longer. 

 Sense organ of third antennal segment as in plate 32, figure 363. 

 Fourth antennal segment without special olfactory setae; with a 

 terminal papilla. Unguis (pi. 32, fig. 364, 365) curving, with a pair 

 of small lateral teeth; inner margin miidentate near the middle 

 (though the tooth is sometimes minute or absent, especially in small 

 individuals). Unguiculus extending half as far as unguis, broadly 

 sublanceolate, apically acummate, with or without an angle tooth. 

 Tenent hairs absent; in place of these a single long seta. Abdominal 

 segments without ankylosis. Third abdominal segment slightly 



