138 JUMPING PLANT-LICE. 
of which the posterior ones are fitted for jumping. Their peculiar 
feelers, which are armed at the tip with one or two bristles, are 
nine- to ten-jointed; their tarsi are two-jointed. Their thighs 
are thick, and the posterior shanks are armed with stout spurs 
at their tips to aid in leaping. The short and three-jointed beak 
Tinks, MMR EAN 
SPW Os oS eieg 
$B 
Fic. 129b—a, head of adult, front view; c, cones 
of cly peus; o, ocelli; b, antenna of adult, all en- 
larged (after Slingerland), Div. of Entomo- 
logy Dep. of Agriculture. 
Fic. 129a—Psylla pyricola 
Forster: adult, enlarged 
(after Slingerland); Div. of Fic. 129d—Egg, enlarged (after Slinger- 
Entomology, Dep. Agricul- land). Div. of Entomology, Dep. of 
ture. Agriculture. 
Fic. 129c—Venation of wings. s, stigma; Fic. 129e—Full grown nymph, dorsal 
c, clavus, c, s, claval suture—enlarged view—enlarged (after Slingerland) 
(after Slingerland). Div. of Entomo- Div. of Entomology, Dep. of Agri- 
logy, Dep. of Agriculture. culture. 
is placed almost between the fore-coxz, where it fits into a groove. 
Both sexes possess wings in their adult forms. The ample and 
frequently transparent wing-covers are thicker than the wings, 
and possess stout curving veins, which enclose a few areoles at 
the tip. They possess a flat and transverse forehead with three 
ocelli. 
