29 



1 did not succeed in rearing Chll<)Coru>< hiindnerus^ )iut secured only 

 the data given in the table. 



The length of time .spent by these beetles in theii- different stages 

 varies considerably; it is influenced chiefly by the food supply and 

 weather conditions. 



If the}^ are furnished Avith an abundance of food, and the weather 

 is yery warm, the length of time spent in each stage ma}^ be con- 

 siderabl}' reduced. 



The next table giyes a somewhat incomplete record of the average 

 amount of food consumed daily by the beetles and the amount eaten 

 during each laryal stage while they were being reared in captivity. 

 The aphids which seryed as food were of different species, and would 

 average about the size of half-grown apple aphids. The birch aphid 

 eggs were of the same form and color, but slightly smaller than the 

 eggs of the apple aphis. 



Number ofaplmU consumed daily hij huli/hinls of several species dimng different stages. 



Species. 



Adalia bipiinctata 



Anatis ;,5-punctata .. . 



Mysia pnllata 



( occinella sanguinea 

 Coccinella S-notata. . . 

 Copoinelia trifasciata. 



First 

 larval 

 stage. 



Second 

 larval 

 stage. 



Third 

 larval 

 stage. 



23 

 107 



60 



50 



Fourth 

 larval 

 stage. 



Adult 

 stage. 



10 

 213 



100 

 50 



An adult specimen of Adalia hipunctata consumed 100 aphid eggs 

 daily, and an adult of Chilocorus hivuhieras ate about one-half as 

 many of these eggs during the same period. 



The records giv^en show in a general way something of the economic 

 value of the insects discussed, and gives, it is hoped, more definite 

 data concerning some points in their life history than has been pub- 

 lished heretofore. 



Mr. Marlatt stated that he had been much interested in this paper, 

 and thought that it threw light on a number of matters about Avhich 

 information was needed. He asked Mr. Kotinsky to give a brief 

 statement on the amount of food which the Asiatic ladybird would 

 eat, since Mr. Kotinsky had been looking after those details. He 

 further stated that the g^^^ record.s which Mr. Burgess had given were 

 interesting, ])ut he did not consider them of sufficient number to war- 

 rant definite conclusions as to the number of eggs deposited by the 

 insects. He thought Mr. Schwarz could give some information on that 

 point. He thought that probably all ladybirds would be found to live 

 for a considerable length of time, the imported Chilocorus similis sur- 



