Distribution of Lepidoptera. 493 



gradually become rare in a noi'tlieru direction^ and find 

 an earlier northern limit than those of the preceding 



(3.) Scottish Type, — species having their chief preva- 

 lence in Scotland, and becoming rare in a southern 

 direction. 



(4.) Intermediate Type, — species having their chief 

 prevalence in Mid Britain, and becoming rarer in a 

 northern and southern direction. 



(5.) Highland Type, — the species referred hereto 

 are distinguished from the Scottish type by being more 

 especially limited to the mountains or their immediate 

 vicinity. 



(6.) Germanic Type, — species chiefly prevalent in tlie 

 south-east of Britain, and becoming rarer in a northern 

 and western direction. 



(7.) Atlantic Type, — species chiefly prevalent in the 

 south-west of Britain, and becoming rarer in a northern 

 and eastern direction. 



(8.) Local or doubtful Type, — species restricted to 

 single or few provinces, not showing such a decided 

 tendency to the east or the west, to the south or the 

 north, to the mountains or otherwise, as to warrant their 

 assignment to an 3^ of the preceding types. 



Much misapprehension having existed with regard to 

 these " types of distribution," some further information 

 respecting them may be advisable. 



British Type. — It is to be observed (says Mr. Watson, 

 C. B. vol. i. p. 45), that the name of " British Type " is 

 applied to them [i. e. the species referred to this type) 

 not on any hypothetical notions of their origin within 

 Britain, but because such a general distribution and pre- 

 valence indicates great adaptation to the climate and 

 other local conditions of this country, and entitles them 

 to be considered thoroughly native both in England and 

 Scotland. 



English Type. — The terminal lines of the species 

 referred to this type are very different among them- 

 selves ; some being entirely limited to two or three of 

 the most southern provinces of England, while other 

 species occur in all the provinces of Britain, with an 

 exception of two or three of the moist northern, the great 

 majority having their limits between these two extremes. 

 The name of " English Type " will not be misunderstood 

 to indicate that all the species are peculiar to England, 



