82 



PltOF. A. B. IMMS OX 



limits in the E. Himalayas may extend up to an elevation of 

 14,000 feet, while in the W. Himalayas it attains in places an 

 altitude no hijrher than 9000 feet. 



Text-fifT. 14. 



Mnp showing the localities from which the Collembola treated in this paper were 

 obtained. Mountains are represented b3' the dotted lines. The thick line 

 represents the boundary between the Oriental and Palasarctic regions according 

 to Blanford (Phil. Trans. Roy. Soc. B, vol. 194, 1901). 



The Palpearctic Collembola considered in the present paper were 

 all obtained from around Badrinath, and the country north of that 

 locality, in British Garhwal. They were met with at elevations 

 varying from 10,200 feet to over 12,000 feet, and at a minimum 

 elevation of 500 feet above the limits of forests. None of the 

 species obtained from this area were found in the Oriental region, 

 either among the lower slopes of the Himalayas or from " tropical 

 India." These Pala^arctic forms are all referable to well-known 

 genera. 



Among the Oriental Collembola it has been found necessary to 

 create four new genera, i. e. : Heteromv,ricus, Dicranocentroides, 

 Idiomerus, and Pseudocyplioderus. The remaining species belong 

 to genera whose range extends into at least one other zoo- 

 geographical region. 



Among the new forms described the most remarkable is Hetero- 

 m^iricus cercifer, gen. et sp. n. It is unique among Collembola in 



