702 Major Neville Manders on 



marked like Nos. 4, 11 in Plate XXXIV, i. e. Gnmna; the 

 strias in most, however, not being quite so pronounced as 

 in No. 4. 



Only four (all females) bore at all heavy markings as in 

 No. 7 (this I should call C. gnoma), and in these the color- 

 ation of the striae was of a light yellowish shade, which 

 shade, he says, appears to prevail in the majority of dry- 

 weather females. These sixty insects would appear to be 

 all C. gnoma. I have written to ask him to capture this 

 year several hundreds if possible, as I think the numbers 

 too few for a correct estimate. 



A large number of larvae were kept in a glass jar and 

 the atmosphere was kept saturated with moisture, the 

 temperature being about 80° F.; this was also the tempera- 

 ture of the outside air at the time. A considerable 

 number of the pupee promptly rotted, and the amount 

 of moisture was necessarily reduced. The left-hand series 

 in the photograph shows the result ; they all emerged 

 between the 5th and 12th of December and are mostly 

 females. In future experiments I should employ wet and 

 dry bulb thermometers. These five were the only ones that 

 survived. 



A considerable number of pupa3, the larvae of which 

 were reared under normal conditions, were kept at a 

 temperature between 55" F. and 65° F. by means of ice ; 

 the result is shown in the secund row of the photograph. 

 All emerged between the 9th and I7th of December. The 

 mean temperature of Colombo is 75" F. and the lowest 

 ever recorded is 68' F., the pupte were therefore 10° to 

 20° below normal. It was distinctly difficult to keep 

 the pupae down even to this temperature, but in future, 

 now that there is a cold storage depot in Colombo, I 

 would try and make use of it for experimental purposes. 



The attempt to keep pupae in an abnormally hot dry 

 atmosphere failed — the pupae all dried up. 



Finally, certain unfortunate larvae were in an anhydrous 

 atmosphere, a large glass jar with coral unslaked lime. 

 It was exceedingly difficult to keep them alive, as they, 

 the food-plant, and even the eggs shrivelled up. However, 

 by reducing the amount of lime five specimens survived 

 and are shown in column 3; they hatched between 11th 

 and 18th December. 



A wet and dry bulb thermometer would be usefully 

 employed in this experiment also. 



