1922] Flint: Nomophila Noctuella 155 



weather, however, was followed by almost a month of 

 abnormally low temperatures, with several snow storms and 

 many nights when the temperature was several degrees below 

 freezing. In cages, the first adults were taken on April 21, 

 and again on June 19, August 3 and October 4. Larvae from 

 the last named adults went into hibernation the latter part of 

 October, many of them being full grown at this time. 



Judging by the observations made during the seasons of 

 1919 and 1920, four generations of the insect occur each year, 

 being divided as follows: 



Hibernating larvae. 



First brood pupae. 



First brood adults. 

 First generation consisting of— 



First brood eggs. 



First brood larvee. 



Second brood pupae. 



Second brood adults. 

 Second generation consisting of — 



Second brood eggs. 



Second brood larvae. 



Third brood pupaj. 



Third brood adults. 

 Third generation consisting of — 



Third brood eggs. 



Third brood larvae. 



Fourth brood pupae. 



Fourth brood adults. 

 Fourth generation consisting of— 



Fourth brood eggs. 



Fourth brood larvae. 



The average period from adult to adult for each generation 

 was fifty days. Females were observed to lay over 100 eggs. 

 The average egg period was six days; average larval period 

 thirty days; average pupal period ten days. 



So far as our observations go, they pass the winter in the 

 larval stage in heavy silken cases just at, or below, the surface 

 of the ground, and protected by the overhanging leaves of 

 plants, bits of which are incorporated in the cases. 



Larvae, as noted by Dr. Felt, feed mainly on legumes. 

 The observations here recorded show that they seem to prefer 

 red clover {Trifolium pratense), sweet clover {Meliotiis alba), 

 and alfalfa {Medicago saliva). They have, however, been 

 found in a few cases feeding on blue grass {Poa pratensis), 

 purslane {Portulaca oleracea), corn {Zea mays), wild mustard 

 {Brassica arvensis), cinquefoil {Potentilla canadensis), white 



