OWLET MOTHS TAKEN AT LIGHT TRAPS 25 



and from year to year, and also as to the time of year when the greatest 

 period of night occurred. In general, however, flights of individual 

 species showed the same trend in all the localities. 



Species having a single generation annually had a rather short 

 flight period, usually from late August to early October. Choriza- 

 grotis auxiliaris, an exception to this rule, had an enormous flight in 

 May and June and a much lighter flight in the fall. 



Owing to overlapping of broods, the flights of the different genera- 

 tions of multiple-generation species were not clearly defined. HeJiothis 

 armigera was scarce early in the season, with a marked increase in 

 abundance in the fall. Peak abundance of Prodenia ornithogalli and 

 Peridroma margaritosa saucia occurred in midseason, followed by 

 comparative scarcity in the fall. Protoleucanm aJbilinea showed two 

 distinct flight periods, one early in May and the other late in August 

 or early in September. 



