1012 I. M. Hawey 
generation. As the early-season hosts were not seriously injured, the first 
generation no doubt developed unnoticed and the pest appeared on beans 
in midsummer greatly augmented in numbers. 
The green clover worm usually hibernates as a moth (fig. 96, B). In the 
fall the parent insect crawls into strawstacks, into barns, under the bark of 
mn resin 
Fic. 96. PLATHYPENA SCABRA AND AGRIOTES MANCUS 
A, Pupa of Plathypena scabra, X about 3. B, Female moth of P. scabra, slightly enlarged. C, Larva of 
P. scabra parasitized by larvae of Rhyssalus loxoteniae, enlarged 
D, A larva of Agriotes mancus entering a diseased bean root, slightly reduced 
trees, or to any place where it may be protected from the cold. It is prob- 
able that under normal winter conditions a large proportion of these moths 
die before spring, but the winter of 1918-19 was so mild that the number 
of insects emerging from hibernation the following spring was far above 
the average. The mean temperature at Ithaca for the months of December, 
1918, and January and February, 1919, averaged 11 degrees higher than 
