Central Asia, where the species is alncst indistingiiishable from 

 H. detritum . "It may be best to regard "H. scupense " as a winter, 

 "single host form of H. detritum " .. ~ 



Schiilze collection material labelled H. scupense conforms 

 to the above remarks but is not extensive enough to be of great 

 value. 



It is difficvilt to decide what taxonomic disposition should 

 be made of biological entities with slight morphological varia- 

 tions, such as "H. scupense " appears to be. It appears that the 

 observations on This form have been carefully done, but the bio- 

 logical and taxonomic principles involved are unusual if not 

 unique in the study of ticks. Pomerantzev's approach appears to 

 have considerable merit. 



- A19- 



