38 
HALF HOURS WITH INSECTS. 
[Packard. 
in their jaws and carry them to a place of safety in their 
nests, if danger threatens. 
The injury done by aphides is incalculable. The Wheat 
aphis at certain seasons, 
when extremely abundant, 
by its punctures, and the 
consequent loss of sap, 
causes the crop to dimin¬ 
ish, the kernel being partly 
Pemphigus. shrivelled and lessened in 
weight. The leaves of the elm, apple tree and currant 
are curled up, and the tree disfigured by them, while other 
Fig. 25. 
Fig. 26. 
Larva of Syrphus. 
Fig. 26 a. 
Syrphus Fly. 
Fig. 27. 
Lady-bird and young. 
Fig. 28. 
forms (Pemphigus, Fig. 25) produce gall-like swellings on 
leaves and the roots of trees. An instance where the same 
6 
