124 
Psyche 
[December 
beak. This exposes the salivary pump, which is firmly 
embraced by the ventral arms of the hypopharynx (Plate 11, 
Fig. 1). The latter hold it in place and enclose the short 
duct leading to the stylets. The pump itself closely re- 
sembles that of Belostoma (Marks 1958). It is rather large 
and heavily constructed, which is somewhat surprising in 
so small a bug. The pump is operated by two powerful 
muscles which insert on the forked apodeme of the plunger 
of the pump and originate on the wings of the hypopharynx, 
one on either side of the food pump. 
The food pump itself is found dorsal to the salivary 
pump, partially obscured by the latter and by the arms of 
the hypopharynx. Both of these can be removed by gently 
pulling them away. This exposes the ventral wall of the 
food pump for its entire length. From the ventral aspect 
it is somewhat triangular in shape (Plate 11, Fig. 1). It 
begins at the anterior end as a sheath around the food 
channel and widens gradually into the anterior or cibarial 
portion of the pump. This region extends approximately 
one half of the length of the pump. At this point it flares 
laterally to form the heavily seerotized pharyngeal portion 
of the pump. There is a dark, heavily sclerotized bar in this 
region which is visible through the floor of the pump. It 
arises from the dorso-lateral edges, and arches ventrally 
crossing the pump just in front of its widest point. This 
Explanation of Plate 10. 
The head of Pelocoris jemoratus P.B. Figure 1. Composite stereo- 
gram showing structure of pump and relationship with the rest of the 
head. Figure 2. Parasagittal section showing the lateral aspects of the 
food and salivary pumps. Figure 3. Sagittal section slightly lateral to 
the midline, showing the internal structure of the food and salivary pumps. 
Abbreviations Used in Plates: AB — anterior sclerotized bar; AH — 
arms of hypopharynx; AP — apodeme of salivary pump; BP — bristle 
pouch ; CM — cibarium ; ES — esophagus ; FG — frontal ganglion ; FP — 
fpod pump; FR — floor of pump; G.l — muscle group 1; G.2 — muscle 
group 2 ; G.3 — muscle group 3 ; HX — hypopharynx ; LF — lateral fold ; 
PB — posterior sclerotized bar; PX — pharynx;. SB — sclerotized bar; 
SP — salivary pump; ST — setae-like teeth; TF — transverse fold; T.I — 
first toothed fold; T.2 — second toothed fold; WH — wing of the hy- 
popharynx. 
