388 



June, and early July, and goes on until the end of August, and 

 I have found a few as late as September 12th. The winged 

 females leave the dying peas and fly to the wild Everlasting^ 

 Pea {Lathyrus sylvestris) and the cultivated garden Everlastings 

 and also to clover, where the se'xuparae are later produced. The 

 ova I found were laid low down on the haulm, close to the 

 ground as a rule, but some on any part of the plants. At first 

 they are green, but in a few days assume the black shiny colour 

 so characteristic of Aphis eggs. In 1907 I found the ova hatching^ 

 on March 27th, at which time the Everlasting Peas were first 

 shooting above the soil. The same happened on clover, where 

 the majority seem to winter and live until they migrate to the 

 peas and set up the summer progeny. Normally their autumn, 

 winter, and spring habitat in this country is clover and the wild 

 Lathyrus sylvestris. The colonies I have found on the Shepherd's 

 Purse {Capsella hursa-pastoris) in the autumn have never sur- 

 vived. Patch {Bulletin No. 190, Maine Agricultural Experiment 

 Station, U.S.A.) was unable to get this Aphis to live on Tri- 

 folium pratense, but was able in August to get them to breed 

 on Shepherd's Purse, but no mention is made of the sexuparae. 

 Various other plants were tried by Miss Patch, such as barley, 

 wheat, oats, purslane, beets, and squash, but the colonies all 

 died out. 



In 1910 I placed colonies on willow, raspberry, clematis, 

 clover, and Lathyrus, and only on the two latter did they continue 

 to breed until the autumn, when an oviguous race was produced. 



This, then, narrows down the list of summer and winter host 

 plants, and so by the destruction of the perennial wild peas, 

 and the feeding on of clover prior to migration, much may be 

 done to lessen the damage that in certain years is very serious. 



Genus Megoura Buckton. 



Mcgoura vicicB Kaltenbach, Aphis vicice- Kaltenbach. 



This insect was described by Kaltenbach {Mono. Pflanz.^ 

 p. 20, 1843) as feeding on Vicia sativa, V. sepium, V. angustifolia, 

 and V. faha, also on Lathyrus pratensis from June to September. 



I have found it in abundance on garden peas, the colonies- 



