718 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XIV. 



is decidedly variable, which variability is dependent on the seasons. In the 

 dry season the species is smaller, the markings on the under surface are much 

 reduced and inclined to be reddish ; but I have not in a large series seen rny 

 Bpccimens which would deserve the name T. alteratus, which is the dry 

 weather form of the insect as found in the Punjab, Tliis no doubfc is due 

 to the more equable climate of Ceylon, and I am strongly under the belief 

 that variation of temperature has much more to do with seasonal forms than is 

 usually attributed to it. In the Punjab during the cold weather five i r six 

 degrees of frost is by no means uncommon, and at midday the sun is 

 extremely hot, and it is this great variation of temperature that produces the 

 extreme forms of T, theophrastus. 



( To be continued.) 



