I. Insects Affecting Late Cabbage. 
INTRODUCTORY. 
All branches of industry and science have terms and names 
peculiar to themselves. This is especially true of Entomology. 
As the terms used in Entomology are liable to be confusing to 
persons who are not familiar with them, a brief explanation of 
some of those used in the following paper is given.* As a general 
rule, nearly all insects have four more or less distinct stages or 
periods in their life: rst, the eggs; second, the larva (grub 
worm, caterpiller, slug, maggot, etc.); therd, the pupa (cocoon and 
chrysalis, pupa case, resting stage, puparium, etc.); fourth, imago 
(adult, beetle, bug, butterfly, moth, wasp). , 
This report of insects infesting late cabbage treats of the follow- 
ing species : 
European Cabbage Butterfly (Prercs rape). 
Cabbage Plusia, or Cabbage Moth (Plusza brassice). 
Cabbage Plutella (Plutella cruciferarum). 
, Cabbage Aphis (Aphis brassice). 
Green fly (’hopalosiphum dranthi). 
Onion Thrips (Zhrips alii). 
Harlequin Cabbage Bug (Murganti histrionica). 
Zebra Caterpillar (Alamestra picta). 
Cabbage Pionea (P2onea rimosalis). 
_ Southern Cabbage Butterfly (Peris rape). 
THE EUROPEAN CABBAGE BUTTERFLY. 
Preris rape, Linn. 
(Ord. LeprpoprErA: Fam. Paprriionip*.) 
~ “The European cabbage butterfly,” or, as it is often called, 
“The Imported Cabbage-worm,” is too well known in the but- 
terfly and caterpillar stages to need a description. The egg is 
not so well known, and as the cocoon of one of the parasites* of 
_ this caterpillar is often mistaken for the egg, a figure of each is 

* Apantales glomeratas, 
93 
