2 34 Alexander W. Evans, 



stated that M. tabularis (i. e., M. Berteroana) was the southern 

 representative of the northern M. polymorpha, thus implying that 

 the latter species was absent from antarctic regions. Stephani® 

 is even more definite when he describes the habitat of the species 

 as "Europa, Asia et America septentrionalis." Other authors, 

 however, cite definite stations for M. polymorpha from the 

 Southern Hemisphere. It will be sufficient to mention in this 

 connection the recent record by Schiffner^ for Kerguelen Island, 

 that by Kaalaas® for the Crozet Islands, and that by Howe® 

 for South Georgia. In the opinion of the present writer the 

 occurrence of the species in South America has been clearly 

 established. Specimens from Ecuador, Bolivia and Patagonia 

 have been carefully studied and have been found to agree in all 

 essential respects with European and North American material. 

 Specimens from Kerguelen Island, collected by the Challenger 

 Expedition, and the specimens from South Georgia cited above 

 have likewise been examined, and have been found equally con- 

 vincing, but no further statements can be made from personal 

 knowledge regarding the distribution of the species in other parts 

 of the Southern Hemisphere. 



On account of the abundance of M. polymorpha in the United 

 States and northward it seems inadvisable to give a full list of 

 the North American specimens which have been examined. It is 

 enough to state that the species' has been collected in Greenland 

 and other parts of arctic America, in Alaska, in nearly every 

 Canadian province and territory and in nearly every state of the 

 Union. The specimens cited below are from tropical North 

 America and from South America. 



Federal District of Mexico: Canada San Magdalena, Con- 

 treras, October, 1908, Barnes & Land 455, 458 (Y.). 



Oaxaca: near Miahuatlan, 1895, E. W. Nelson 2^30 (U. S.). 



Puebla: banks along Avenida Hidalgo and path to barranca, 

 Tezuitlan, October, 1908, Barnes & Land 541, 542 (Y.) ; Santa 

 Barbara, near Puebla, November, 1909, Frere Nicolas 20 (Y.). 



*Bull. Herb. Boissier 7:393- 1899. 



' Deutsch. Siidpolar-Exped. 8 : 64. 1906. 



•Nyt Mag. Naturv. 49:86. 191 1. 



'See Taylor, N. Sci. Bull. Mus. Brooklyn 2:62. 1914. 



