MEMBRA CIDJE. 
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DESCRIPTION OE PLATE A. 
Fig. 1. The head of Enchenopa cruentata — (e) The eye; ( o ) ocellus; frons and 
(f) clypeus below; (/) spatulose legs with the tarsus ; (pr) fore-edge of the 
pronotum. 
Fig. 2. Front view of the head of Aconopliora nigrissima — (e) The elongated eye, 
covered by the transparent cornea; ( o ) ocellus ; (/•) rostral two-jointed sheath, 
with the proboscis below, furnished with bristles ( s ) or extruded seta?. 
Fig. 3. Profile view of the head of Membracis mexicana — (e) Prominent eye set in 
its socket; (o) ocellus ; (r) rostral sheath. 
Fig. 4. Head and fore parts of Membracis fasciata — (lab) Labrum above the rostral 
sheath ; (/) clypeus covered with fine hairs. The frons above shows the two 
ocelli between the true eyes ; (t) insertions of the tegmina' or upper wings; 
(lb) first and second tibiae with their tarsal joints, the first two pairs are spatulose, 
the foliacious plate by the front view, conceals only half the tibia ; (pr) the 
front part of the pronotum overhangs the head. 
Fig. 5. Part of the pronotum and body of Centrotus leucaspis — (h) shows the aperture 
in the pronotum through which the head protrudes ; (pr) pronotum; (sp) the 
supra-humeral processes or horns. Sometimes these excrescenses are large and 
branching, but in some species they are wholly absent; (s) scutellum seen in 
part below the pronotum ; often this part of the thorax is quite hidden. 
Fig. 6. The body of Umbonia spinosa divested of the whole sheath of the pronotum, 
thus showing (m) the bullae of the meso- and the meta-notum which are concealed 
by the pronotum. It will be seen that the insect with its legs and wings is almost 
complete without the extraordinary adjunct of the pronotum ; (r) the somites 
or rings of the abdomen. The representative of the scutellum may be seen 
above the somites of the abdomen; (p) the last abdominal ring of the female, 
with the pygofer which carries the genital valves ; (/) femur of the hind leg. 
Fig 7 ■ Head of Umbonia spinosa , by front view — (at) Antenna? placed just below the 
ocelli (o). The stout rostral sheath with bristles at the tip; (e) the com¬ 
pound eye. 
Fig. 8. An example of Membracis mexicana which has been bleached and made trans¬ 
parent by Canada balsam. It thus shows the meso- and meta-notum through 
the (pr) pronotum ; (sp) the spiracles ranged on the sides of the abdominal rings. 
The genital plate with its saws is seen below. 
Fig. 9. Rostral sheath of Umbonia orozimbo , showing the three long seta? proceeding 
from it. The action of these long bristles probably consists in lacerating the 
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