Psyche 
[June 
114 
January 22, 1968. Specimens in the Sheldon collection and in the 
U. S. National Museum. 
Cocoon — Length 6.0-8.0 mm, width 2.0-2. 5 mm; walls 0.02 mm 
thick, brittle; surface slightly granular, granules consisting of min- 
ute pieces of stone; no pores present; one end with a solid plug of 
dark material; cocoon surrounded by delicate silken threads at- 
taching cocoon to inside of cell. 
Discussion 
The generic characterization of Pis on larvae given by Evans 
(1957: 9°) in his Table of Generic and Subgeneric Characters is 
as follows: “Apex of the maxilla with the surface papillose (fig. 67) ; 
maxillary palpi only slightly longer than the galeae; spiracular sub- 
atrium elongate, smooth-walled (fig. 66) ; head strongly roughened 
on the top and sides and rather strongly setose (fig. 65).” The first 
two characteristics in this diagnosis apply quite well to P. koreense 
and are sufficient to separate Pison from Trypoxylon without modifi- 
cation. The spiracular subatrium of P. koreense , however, is not 
smooth-walled (fig. 6), and the head is only moderately roughened 
on the top and sides, and is only moderately setose (fig. 8). There- 
fore the third and fourth characters cited by Evans should be modified. 
The studies of Micheli (1933), Evans (1957), and Cowley 
(1962) have provided data on the species P. atruin Spin., P. argentav 
tnm Shuckard, and P. spinolae Shuckard, from which P. koreense 
seems to show a number of differences. Only Evans (1957) has 
presented a sufficiently precise morphological description of the larva 
to permit a detailed comparison of this stage. The spiracles of P. 
koreense differ from those of P. argentatum as described by Evans 
in having a larger external atrial opening, a number of low ridges 
on the atrial wall, the opening between the atrium and subatrium 
smooth, and noticeable swellings along the length of the subatrium. 
Evans also illustrated the spinnerets of P . argentatum as having a 
common external base. Under phase microscopy I found that in P. 
koreense the spinnerets unite internally with a membranous salivary 
reservoir which is continuous with the paired salivary ducts. If the 
reservoir is extensile, it may be that when fully extended the spin- 
nerets would appear to have a common base. In contrast to P. 
argentatum , but like P. atrum , P. koreense has six sensory cones 
on the epipharynx. Cowley did not give a description of P. spinolae 
with his two small figures. These are not in agreement with the 
other descriptions of Pison , as they indicate the presence of an obvious 
coronal suture, a different position of the anus, a differently shaped 
