62 
Psyche 
[April 
5, while the external lips of the fold meet to form the pleural 
suture ps of Fig. 1, which demarks the epimeron em from the 
episternum es. At the ventral end of the pleural suture ps of 
Fig. 1, is the coxifer cf, or coxa-bearing process, while at the 
dorsal end of the pleural suture ps is the alifer o, or pleural ful- 
crum of the wing. Internal processes of the coxifer labelled 
ecf 3 in Fig. 5, and internal processes of the alifer, labelled ea 2 in 
Fig. 5, are fairly well developed in the roach; and the endo- 
pleuron ep of Fig. 5 gives off an apodeme, or process ap, rather 
closely associated with the furca fu. 
In the meso- and metathorax, there occurs in front of the 
pleural suture ps of Fig. 1, a suture r, which divides the epis- 
ternal region es into an upper region aes, or anepisternite, and a 
lower region, or katepisternite (bearing the label es in Fig. 1). 
An anepisternal incision aei divides the anepisternite into an 
anterior and posterior region. The basalar sclerites x and u, 
situated dorso-caudad of the anepisternal incision aei (Fig. 1), 
are portions of the pleural region. The anterior basalare u of 
Fig. 1 is demarked by the suture s, and it bears an internal 
process eb of Fig. 5. The posterior basalare x of Fig. 1 is a de- 
tached portion of the pleural region in front of the alifer o, and 
both of the basalar sclerites are associated with the movements 
of the wing in flight. 
Above the alifer o of Fig. 1 is the intraalare ia (See also Figs. 
13 and 14), which is an alar ossicle connected with the dorsal 
alar ossicle a of Fig. 16 (Compare also Figs. 13 and 14). The 
sclerite ia may be a detached portion of the wing structures, 
but it is hardly a detached portion of the pleural region. The 
subalare sa of Fig. 1, however, may have been formed by the 
deposition of chitin in the membrane below the wing, for the 
attachment of the mero — subalar muscles extending between 
the meral region of the coxa and the subalar plate in question. 
The trochantin, bearing the labels atn and ptn in Fig. 1, is a 
triangular plate in front of the coxa, and the trochantin bears at 
its tip an internal trochantinal tendon tin of Fig. 5, for muscle 
attachment. A trochantinal suture, with its corresponding in- 
ternal ridge or endotrochantin etn of Fig. 5, divides the trochantin 
of the meso — and metathorax into an anterior region atn and a 
