28 
ZEUZERIDiE. 
MACROGASTER ARUNDINIS. 
Plate VII. Figure 1. 
This insect measures from about one inch and a 
quarter to nearly one and three quarters. Male : front 
wings rather light brown or yellowish brown, dotted 
more or less with a darker colour, and with, but some¬ 
times without, a dark streak of the same from the base 
towards the tip, a little within the upper edge. Hind 
wings dull greyish brown. The body is singularly long 
and of a greyish brown colour. The female is con¬ 
siderably larger than the male. Hind wings dull 
greyish white ; the body similar. 
Localities for this species are Epping Forest, Whit- 
tlesea Mere, and Yaxley Fen. 
The situations where it is found are reed beds, or 
the sides of drains where these plants grow. 
The date of the appearance of the perfect insect is 
in June. 
The caterpillar is dull yellowish, the head brown, as 
is the second segment. 
The date of its appearance is in April. 
The caterpillar feeds in the stems of the common 
reed f Arundo phragmitis ). 
