1968] 
Sheldon — Pison koreense 
H3 
to the junctions of the scale-like plates; opening between atrium and 
subatrium smooth, lacking folds and spines; subatrium with noticeable 
swellings along its length; prothoracic spiracle slightly larger than 
others. 
Head capsule (fig. 8) : 0.84 mm wide, 0.74 mm high. Coronal 
suture and parietal bands not evident. Setae fairly numerous, mod- 
erately strong. Antennal orbits transversely ovoid, 0.045 mm in 
greatest diameter. Clypeus with six moderately strong setae, and 
ten small circular setaless sensilla, dorsal to these. 
Mouthparts: Labrum (fig. 9) 0.30 mm wide, 0.14 mm high 
at midline, greatest height 0.15 mm; apical margin emarginate 
medially; surface with low transverse ridges; a number of small 
sensory cones laterally and with several moderately strong setae. 
Epipharynx (fig. 9) with two small groups of sensory cones medially; 
surface papillose, except spinulose laterally. Mandibles with apex 
rather blunt, two worn apical teeth present; teeth bordering scooped 
out area worn and indistinct; a single setae near the base; length 
0.31 mm, maximum width 0.20 mm. Body of maxillae (fig. 7) 
rounded apically, sub-papillose; five moderately strong setae. Lacinial 
lobe angular, spinulose apically. Length of palpi 0.05 mm, of galea 
0.04 mm. Labium (fig. 10) with two patches of spinules on oral 
surface; four strong setae on aboral surface; length of palpi 0.05 mm; 
spinnerets blunt apically, slightly longer than palpi, united internally 
with membranous salivary silk reservoir. 
Variation — Observations on the variation in body length and 
the number of setae on the clypeus, labrum and maxilla were made. 
It was found that the length varied from approximately 6.3-7. 5 mm 
(five specimens). The number and position of the setae is also 
variable: clypeus six to eight setae (three specimens) ; labrum eleven 
to twelve setae (two specimens) ; maxilla five to seven setae (two 
specimens) . 
Material — Five diapausing larvae from cocoons collected under 
a bridge one mile east of Urbana, Illinois, August 29, 1967 and 
Explanation of Plate 6 
Fig. 5. — Diapausing larvae of Pison koreense. Fig. 6. — Spiracle. Fig. 7. 
— Apex of maxillae, anterior aspect. Fig. 8. — Head, anterior aspect. 
Fig. 9 — Labrum: anterior surface (left) and epipharynx (right). Fig. 10. 
— Labium, anterior aspect. 
Abbreviations: Ant — antenna; Atr — atrium; Cb — cibarium; Ga — 
galea; Lc — lacinial area; Md — mandible; Pip — palpus; Satr — suba- 
trium; Sid — salivary duct; SlRes — salivary reservoir; Sr — Spinneret; 
Tra — trachea. 
