184 
BRITISH APHIDES, 
very long, the joints tipped with black. Hairs 
capitate. 
Yar. 2. — - Much larger. Wholly emerald green. 
Oblong, flat. Wing-cases whitish. Abdominal wings 
well defined. Antennse relatively much shorter than 
in Variety 1. Rostrum short. 
Winged viviparous female. 
Yariety 1. Variety 2. 
Inches. Millimetres. 
Expanse of wings 0*250 0'400. 10‘16* 
Size of body from O'OSO X 0‘030 to 0*130 x 0*45. 3*30 x 1*13. 
Length of antennse 0*110 0*140. 3*55. 
,5 cornicles 0*035 0*020. 0*50. 
Yar. 1. — Bright green. Both head and prothorax 
marked with two pointed streaks. Ocelli large. 
Frontal tubercles conspicuous. Antennse black. 
Thoracic lobes, spot below the scutellum, and six 
transverse abdominal bars, black. Also the two spots 
from which the green cornicles rise are black. Tail 
small. Legs brownish. Tarsi and tips of cornicles 
black. The setaceous seventh joint of the antennse 
appears to be very liable to injury, even when the 
insect is at large. Thus, the antenna often appears to 
have less than its normal length. 
Yar. 2. — Considerably larger than the previous insect. 
Antennee and legs less developed. Colouring much as 
on the former insect, but paler. Wings longer, with 
yellow insertions and cubitus. Veins brown. 
The rostrum is very short, and does not reach to 
the second coxm. 
This species is much harassed and preyed upon by 
parasites. Often by an examination with the micro- 
scope, large, living, wormlike larvae may be detected in, 
perhaps, nine out of every ten specimens examined. 
D, platanoides is common in England and wherever 
the sycamore and maple flourish. The pupae nestle 
by twos and threes under the leaves, and the winged 
females appear in the first week of May. 
