THE ROSE APHIS. 
11 
The adults of all these species seemed to have similar habits. 
They flew swiftly from twig to twig and hovered over them in the 
bright sunlight, the wings moving with extreme rapidity, always with 
a distinct humming 
sound. From time 
to time they alight- 
ed on the twigs or 
leaves and searched 
here and there for 
colonies of the 
aphis. The abdo- 
men was generally 
kept in throbbing 
motion, and when 
an egg was to be 
laid a long slender 
ovipositor was 
thrust out and the 
egg was placed on 
a leaf or twig in the midst of or near the colony of the host insect. 
It was noticed that certain bushes shaded from the sun after 1.30 
p. m. were immediately deserted by these flies until the next day. 
Fig. Z.—Syrphus ribesii, an enemy of the rose aphis: a, Fly; 5, lateral view 
of head; c, larva or active immature form; d, anal spiracles; e, thoracic 
spiracle of same. All much enlarged. (From Chittenden.) 
Fig. 4.—Eupeodes volucris, an enemy of the rose aphis: a, Female fly; b, abdomen of male fly; c, hypopy- 
gium of male fly. Much enlarged. (From Webster and Phillips.) 
The rearing of five different species of syrphus flies from larvae 
found feeding on the rose aphis rather surprised the writer, and he 
regrets that lack of time has prevented a continuation of the work 
