488 
Head of Psylla mali 
ajf. sal. du. 
ant. 
ant. mus. I 
ant. supp. 
buc. cav. 
% 
REFERENCE LETTERING. 
Afferent salivary duct. 
Antenna. 
Antenna muscle I. 
Anterior support of the transverse bar of the tentorium. 
Buccal cavity. 
hue. fid. Buccal fold. 
ceph. mus. Via. Cephalic muscle Via. 
chit. memb. 
clyp. 
div. sal. gl. 
Chitinous membrane of the salivary pump. 
Clypeus. 
Diverticulum of the salivary gland. 
eff. sal. du. Efferent salivary duct. 
el. mus. Villa. Elevator muscle Villa of the labium. 
epiph. 
e\ye. 
ge. con. 
grv. labi. 
hypoph. 
Ls£ leg. 
labi. 
labi. fur. 
labr. 
max. 
max. lev. 
max. scl. 
mnd. 
mus. IXc, 
n.s. 
oc. 
Epipharynx. 
Eye. 
Genal cone. 
Groove in the labium. 
Hypopharynx. 
First leg. 
Labium. 
Labial furrow. 
Labrum. 
Maxillary seta. 
Maxillary lever. 
Maxillary sclerite. 
Mandible. 
Muscle IXc of the labial furrow. 
Central nervous system. 
Ocellus. 
oes. Oesophagus. 
or.mus. VIIa,b,c,d. Oral muscle Vila, b, c, d. 
ph. Pharvnx. 
i 
ph. mus. II. Pharyngeal muscle II. 
post. supp. Posterior support of the transverse bar of the tentorium. 
protr. max. Vb. Protractor muscle Vb of the maxillary seta. 
protr. mnd. Va. Protractor muscle Va of the mandible. 
pu. cli. 
pu. mus. III. 
reto. org. 
retr. max. Vd 
retr. mnd. Vc. 
sal. du. 
sal. can. 
sal. pu. 
se. 
se. ba. 
se. ch. 
sue. can 
Chamber of the salivary pump. 
Muscle III of the salivary pump. 
“ Retortenformige Organe.” 
Retractor muscle Vd of the maxillary seta. 
Retractor muscle Vc of the mandible. 
Duct from the salivary gland. 
Efferent salivary canal. 
Salivary pump. 
Setae. 
Bases of the setae. 
Setal chamber. 
Suction-canal. 
tent.mus. IVb,c,d. Supporting muscles IVb, c, d of the tentorium. 
tr. br. Transverse bar of the tentorium. 
