61 



EXPLANATION OF MAP. 



■-=»«€* 



This Map is intended to illustrate the passage of the 

 migratory swarms of Vatzessa cardui, observed in 1879, 

 an account of which is given at page ']i^ and to show the 

 position of the lighthouses mentioned in the " Migration 

 Reports " mentioned at page 64. 



The names of months and places printed in white in 

 proximity to each other indicate the times at, and districts 

 in which, Vanessa cardui was first observed in unusual 

 abundance. 



The same accompanied by arrows indicate the times and 

 places at which migratory swarms of V. cardui were observed, 

 and direction of flight, 



The white crosses indicate the districts in which V. cardui 

 was subsequently observed in unusual abundance. 



The red stars indicate the position of the lighthouses 

 referred to in the " Migration Reports." 



