756 REPORT OF THE ENTOMOLOGIST OF THE 
Food Plants. At the Queen’s County Fair, last September, 
the following plants on exhibit were infested with the Cabbage 
Aphis: Kohl rabi, kale, Brussels sprouts, broccoh, cauliflower 
and cabbage. In addition to these in the field, it was noticed on 
mustard, ruta-bagas and radish. Prof. Ashmead* gives field 
cress (/satis tintoria), Shepherd’s purse (Capsella bursa pastoris) 
and charlock (Srassica arvensis). 
Enemies. Seven different species of parasites have been reared 
from the Cabbage Aphis in this country and Europe. These 
parasites are very small wasp-like insects. The females are all 
armed with a lance-like ovipositor with which they pierce the 
skin of the aphid to deposit their egg. After the little larva has 
attained its growth it usually changes to a pupa within the aphid. 
In a few cases they issue and spin a cocoon under the dead body 
of the louse. Parasitized aphids can always be distinguished by 
the brown paper-like appearance of their bodies when dead. 
* Aside from the parasites the following insects prey upon plant 
lice: Tree crickets, Lace-wing flies and several species of diptera 
(flies) in the larval stage, also “Lady Birds” in the adult and larval 
form. | 
REFERENCES TO OTHER LITERATURE. 
Koch: Die Pflanzenleeuse, pp. 149-150 (1857) 
Curtis: Farm Insects, p. 69 (1870). 
Kaltenbach: Monographie der Familien der Pflanzenleuse, 
pp. 106-107 (1872). 
Buckton: Monograph of British Aphides, pp. 33-35 (1879). 
Weed: Insect Life, vol. III, p. 289 (1890). 
THE GREEN FLY (22hopalosiphum dianths ScHRank). 
(Ord. Hemiptera: Sub. Ord. Homorrs:a: Fam. ApuivZ.) 
This aphid is the universal “Green Fly” of gardeners. It 
occurs throughout the fall on the underside of the outer leaves of 
cabbage and on turnips. It very rarely increases in suchnumbers — 
as to cause serious injury to cabbage, but entire turnip fields are 
sometimes ruined by it. Ourtist calls it the “'Turnip-leaf Plant- 
louse,” and describes it as Aphis rape. We also states that in 

*U. 8. Dept. Agricultural Div. of Ent., Bull. No. 14, 1887, p. 12. 
+ Farm Insects, by John Curtis, F. L. 8., etc., 1870, p. 68. 
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