EXPERIMENT STATION BULLETINS. 



191 



In color it is greenish, with transverse, velvety-black stripes many of 

 which are decorated with yellow spots. This is the caterpillar that 

 thrusts out a pair of orange colored horns from just behind the head 

 when disturbed. The sickening odor from these horns serves to protect 

 the caterpillar from many predatory enemies, and often from man. 

 When full-grown, the caterpillar seeks some more or less secluded place 

 and changes to an angular, naked, pupa, from which later emerges a 



Fig. 41. — Parsnip-borer, enlarged. Original. 



beautiful black butterfly having both front and hind-wings marked by 

 two rows of yellow spots, the hind-wings each bearing a short tail. 

 There is also a little blue on the hind-wings and an orange and black 

 eye-spot at the inner angle. 



REMEDIES. 



In the case of such a conspicuous caterpillar, hand picking is all that 

 is required. 



INSECTS INJURIOUS TO PEAS. 



INSECTS AFFECTING THE FOLIAGE. 



Green Pea-louse (Nectarophora pisi). 



The green pea-louse is a small aphid or plant-louse, that feeds on a 

 variety of plants, notably clover, sherpherd's purse, the vetches, crimson 

 clover and pea. The clovers, vetches, etc., usually sustain a moderate 

 number of these lice, and it was not until the lice appeared in very 

 great numbers on green peas, that attention was attracted to this insect 



