DESCEIPTION OF PLATE! B. 
97 
DESCRIPTION OF PLATE B. 
Fig. 1. — -Rostrum of StomapMs quercics. Z, labrum ; 
m, rostral sbeatb ; s, the three long setae disengaged 
from the sheath. These are the representatives of the 
labium and the maxillae. 
Fig. 2. — Head of Siplionopliora pelargoni% showing 
the plexus of nerves running to the antennae, the 
compound eyes, the ocelli or supplementary eyes, and 
the parts of the mouth. They all centre in the region 
at the base of the rostrum. 
Fig. 3.— Head and thorax of CJiaitophorus aceris. 
a, head with stemmata ; h, prothorax or neck-ring ; 
c, mesothorax ; d, scutum ; e e, thoracic lobes ; 
/, scutellum ; h, metathorax ; w wing-insertions 
(pterigostia) ; x cV, same of under wings. 
Fig. 4. — Under side of Myzus persicce, a, head ; 
&, prosternum ; r, mesosternum ; metasternum ; 
/, coxae ; r, rostrum, resting in its groove p. 
Fig. 5.— Typical figure of Aphis, after Huxley, 
showing twenty-three somites, with their appendages, 
viz. in the head six ; in the thorax three ; in the 
abdomen, including the genito-anal portion, eleven* 
The stomata, typically, are ten in number. 
Fig. 6. — Apex of the cornicle of SvpJionophora pisi^ 
witb a globule of so-called honeydew. d d^ globules of 
an oily nature floating in an aqueous liquid. 
Fig. 7. — Genito-anal portion of the male of Phorodon 
galeopsidis. a, anal aperture ; p^ exserted penis ; c?, 
cauda ; clasping armature. 
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