108 
Psyche 
[June 
LETTERING OF FIGURES. 
a=chitinous rod at base of mandible. 
ant=antenna. 
b=chitinous triangular plate articula- 
ting with gene. 
b-ant=base of antenna. 
bu=buccule. 
c=clypeus. 
dp=dorsal plate. 
e=eye. 
ec=efferent canal. 
f=frons. 
fe=food canal or suction canal. 
fr=fulerum. 
g=gene. 
gu=gula. 
h=chitinous rod connecting maxillary 
sete and gene. 
he=head capule. 
hph=hypopharynx. 
ht=horns of the tentorium. 
i=chitinous rod behind eye. 
iv=inlet valve. 
k=retractor muscle of salivary pump. 
1=struts to which some of the antenna 
muscles fasten. 
lab=labium. 
Ibr=labrum. 
le=lobes of the clypeus. 
m=mazxilla. 
md=mandible. 
ml=maxillary lamine. 
n=pharyngeal struts. 
oc=ocelli. 
oce= occiput. 
ov=outlet valve. 
p=internal knob below compound eye. 
ph=pharynx. 
phm= pharyngeal muscles. 
pl=plunger of pump. 
pm=protractor muscle of mandible. 
pm, =protractor muscle of maxille. 
pth=prothorax. 
rm=retractor muscle. 
s=sete. 
sc=salivary canal. 
sd=salivary duct. 
sg=salivary glands. 
sp=salivary pump. 
t=tentorium. 
v= vertex. 
vp=ventral plate. 
EXPLANATION OF PLATES. 
Pirate I. 
Fig. 1. Side view of head. 
Fig. 2. Cross section of sete. 
Fig. 3. Mandibular seta showing its connection with the gena. 
Fig. 4. Cross section through the middle region of the pharynx. 
Fig. 5. Longitudinal section of salivary pump. 
Fig. 6. Cross section of the pharynx and salivary pump as seen in fig. 10. 
Fig. 7. Cross section through the eyes. A diagrammatic drawing of fig. 9. 
Pirate II. 
Figures 8-13 are microphotographs. 
Fig. 8. Shows the salivary pump and efferent canal and the attachment of the 
labium. The horns of the tentorium are separated. 
Fig. 9. Cross section of the head through the eyes. 
Fig. 10. Cross section of the head through the bases of the antenne. 
Fig. 11. Longitudinal section of the head showing the pharyngeal muscles, 
pharynx and salivary pump, their supports, and the position of the sete. 
Fig. 12. Shows the ventral plate of the pharynx, and the hypopharynx, which 
are supported by the struts running to the fulcra. 
Fig. 13. Shows the position of the pharynx and sete at their junction, behind 
the lobes of the clypeus. 
1 The microphotographs were taken by T. W. Nicolet, from slider prepared by the author. 
