308 Flemiptera Heteroptera. 
(4) 1. Pale orange-yellow, membrane clear. 
(3) 2. Head and under-side pale. F . PALLICEPS. 
(2) 3. Head and underside black . . - . MELANOCEPHALUS. 
(1) 4. Brown or greyish-brown, sometimes 
nearly black . ‘ F : . CORYLI. 
P. palliceps, Fich—Shining, entirely pale orange- 
yellow or flavous, clothed with pale yellow hairs ; membrane 
clear or sometimes with a slightly darker apical cloud. 
L. 6 mm. 
On ouks ; not quite so common as the following, but 
often occurring with it. 
P. melanocephalus, Linn.— Only differs from the 
above, as faras I am able to discern, by the black head and 
black underside, and also, as Reuter points out, by the 
extreme base of the first antennal joint being black or 
fuscous. 
L. 6 mm. 
On oaks ; common and generally distributed. 
P. coryli, Linn. (var. avellaney ; H. Schf.).—Very like 
the two preceding in shape, but with the cuneus and mem- 
brane shorter; black, brown, or pale greyish-brown, never 
clear orange or yellow, cuneus in the pale examples 
generally darker than the elytra; membrane dusky or 
nearly black, a streak along the edge of the cuneus hyaline ; 
leas and antennee very pale ochreous. 
L. 5 mm. 
Common and generally distributed on Corylus. 
PLESIODEMA, Leut. 
Oval, clothed with pale hairs, but without deciduous scale- 
like pubescence, male more elongate, head short, face 
nearly vertical, rostrum reaching beyond the posterior cox, 
» pronotum with the sides and base nearly straight, tibiae 
with pale spines, femora unspotted, posterior tarsi with the 
third joint subequal to the first and second together. 
There is only one species of this genus. 
