312 Flemiptera-FLeteroptera. 
pale deciduous hairs, male brown-black, elongate-oval, 
ochreous-red, broader; antenne black with the second 
joint in the ¢ more than twice as long as the third, third 
twice as long as the fourth; second in the ? more than 
twice as long as the third, paler in its centre, third not 
quite twice as long as the fourth ; pronotum much raised 
posteriorly, base and callosities black in the 9; elytra in 
2 with the region within the nerves of the corium darker, 
cuneus narrowly pale at the base in both sexes; membrane 
dusky, pale just below the apex of the cuneus; femora 
pale at the apex in the g, red in the 9, tibiw pale with 
strong black spines in both sexes, their apices and tarsi 
dark ; orifice of sac white. 
L. 53 mm. 
The largest of our species; occurs on birch, and is gener- 
ally distributed and common. 
P. ambiguus, Full. (obscurus, D. § S.).—Smaller than 
the preceding ; male with the third and fourth joints of 
the antennee pale, fourth two-thirds as long as the third, 
second joint shorter than in betulet/, about as long as the 
base of the pronotum; elytra rather less elongate; ? 
easily known by the pale second joint of the antenna, whose 
apex is broadly black ; also by the rather duller ochreous 
colour, often inclining to grey, or brown; pronotum uni- 
colorous, brown, blackish or ochreous ; cuneus always red- 
dish; both sexes with the sac orifice black. 
L. 45 mm. 
On apple trees, ete., generally distributed. 
P. obscurellus, Mull. (pint, D. §S S.; pityophilus, Flor.). 
—Small, oval, blackish-brown, clothed with short black 
hairs, and fine silvery-gold deciduous pubescence ; antenn 
pale, second joint longer than the third and fourth together, 
basal joint dark in the d, vertex in the ¢ slightly wider 
than each eye, in the ? nearly twice as wide, the eyes 
being smaller; membrane slightly dusky, the cells darker, a 
clear spot below the apex of the cuneus; tibie dark in the 
¢, paler in the ?, with strong black spines. 
