112 BULLETIN 168, UNITED STATES NATIONAL MUSEUM 



New York: Albany, June 4, 5, 6, D. B. Young (New York State Museum). 

 Ithaca, September, A. D. MacGillivray (Cornell University). Long Island, 

 N. Banks (Cornell University). Macedon, April 20, J. D. Hood. Potsdam, 

 May 26, 29, D. B. Young (New York State Museum). Reserve, April 24, 

 C. R. Crosby (Cornell University). Williamson, May 5, H. Glasgow. 



District of Columbia: Washington, N. Banks (Cornell University). 



Ohio: Salem, April 3, A. D. MacGillivray. Yellow Springs, February 9, March 



4, April 3. 



Illinois: Carbondale, March 4, T. H. Frison and H. H. Ross (Illinois State 

 Natural History Survey). Harrisburg, March 6, T. H. Frison and H. H. 

 Ross (Illinois State Natural History Survey). Homer, February 5, 29, 

 March 14, 21, 25, April 2, 3, 7, 8, 9, 11, 12, 15, 16, 17, 24, May 5, 13, 16, 

 October 15. Metropolis, March 8, T. H. Frison and H. H. Ross (Illinois 

 State Natural History Survey). Urbana, January 1, March 11, 20, April 



5, 11, 12, 25, 26, 30, October 4, November 28, December 21, 28. 



Iowa: Ames, March 31, May 13, J. E. Guthrie; September 3, H. E. Ewing; 



September 22, G. Hendrickson. Sioux City, January 17, 29, December 19, 



C. N. Ainslie. 

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

 Tennessee: Knoxville, March 15 (from MacGillivray). 

 Mississippi: Agricultural College, H. E. Weed (Cornell University). 

 Louisiana: Alexandria, February 27, E. S. Tucker. Tallulah, April 7, 9. 

 Texas: Brazos County, N. Banks (Cornell University). College Station, De- 

 cember 22, C. A. Hart. Denison, February 13, C. R. Jones. Waco, G. W. 



Belfrage (Museum of Comparative Zoology). 

 California: Claremont, December, C. F. Baker. 

 Washington: Olympia, T. Kincaid. Seattle, May 23, A. G. Webb. 

 Alaska: Demarcation Point, May 16; Collinson Point, September 27, F. Johan- 



sen (National Collection, Ottawa). St. Paul Island; Popof Island, T. 



Kincaid (U. S. National Museum). 

 Canada: Bernard Harbour, Northwest Territories, May, F. Johansen (National 



Collection, Ottawa). East Wentworth, Nova Scotia, March, R. M. Munro. 



ISOTOMA (ISOTOMA) VIRIDIS Bourlet yariety CATENA Guthrie 



Isotoma catena Guthrie, 1903, p. 69. — Bacon, 1914, p. 152. 



Description. — This variety is distinguished by the presence on each 

 mucro of a minute additional tooth, situated ventrally at the base of 

 the terminal tooth, as in palustris. In every other respect Guthrie's 

 type and two paratypes, which I have studied, agree with typical 

 viridis. 



Remarks. — This quadridentate variation of viridis is not limited to 

 typical viridis, however, for it occurred in one specimen from Cali- 

 fornia and in another from Oregon, both of which were yellow, 

 heavily marked with black, resembling the variety pomona. In such 

 cases catena would become a subvarietal name. 



Distribution. — Recorded as follows: 



New York: Reserve, April 24, C. R. Crosby (Cornell Universitj')- 



Indiana: Lafayette, J. J. Davis. 



Illinois: Champaign, July 19, M. W. Shackleford. 



Minnesota: Lake Vermillion, May 21, J. E. Guthrie (University of Minnesota). 



Le Sueur, May 26, J. E. Guthrie (University of Minnesota). Minneapolis, 



O. W. Oestlund (University of Minnesota). 



