1914] Life History of Lady Beetles. 215. 
females respectively. These numbers are certainly far below 
’ what the beetles are able to lay under favorable conditions in a 
state of nature. The number of eggs laid in a single batch was 
usually about 30, though the number varies considerably both 
above and below this number. When in good laying condition 
a female will deposit from one to two batches a day. 
Food records.—Several records were taken on the feeding 
capacity of both larvae and adults for plant lice. One larva 
ate 50 Prociphilus fraxinifolii Riley, another half grown, ate 
33 Macrosiphum gaurae, and another half grown, ate 105 Chait. 
negundinis Thos., in a single day. Entire counts of the whole 
number of lice eaten during the larval period were taken in 
four cases and are as follows: 264 (57 M. gaurae, 56 Chaitoph- 
orus negundinis, 151 P. fraxinifolit), 309 (71 M. gaurae 137 C. 
negundinis, 101 P. fraxinifolii), 585 (423 C. negundinis, 72 P. 
fraxinifolii, 90 M.rosae Linn., small), and 576 (263 C. negundinis, 
54 M. rudbeckiae Fitch, 114 P. fraxinifolit, 57 S. schizoneura 
lanigera Hausmann, and 88 M. rosae), of all sizes, by each 
larva respectively. 
A pair of beetles, male and female, ate 150 Chattophorus 
populifolii Fitch, in one day, and 120 Aplus setariae Thos., on 
another day. A male made the following records on diferent 
days respectively: 200 M. gaurae Will., 30 M. rudbeckiae, 33 
A. torticauda Gill., 60 C. negundinis, a 75 M. cerast Fab., 
these lice being of all ages and sizes. 
A female ate on different days, 36 M. rudbeckiae, 180 C. 
negundinis, 165 M. cerasi, 110 A. heliantha Monell, and 120 A. 
setariae respectively. 
The amount eaten varied very considerably on different 
days. For 12 hours before molting the larvae would sometimes 
eat comparatively little, while for several days before pupating 
they would be extremely voracious. Female adults always ate 
the most when laying eggs. The temperature also affected 
their appetites very remarkably, the highest records being made 
on dry hot days, while in damp cool weather they often ate 
almost nothing. 
The state and temperature of the weather was indeed a 
very important factor in the welfare of these insects. Cold 
damp weather would very much retard the rate of growth of 
the larvae and the egg-laying of the females and would seem to 
