1927] Thoracic Sclerites and Wing Bases of the Roach 63 
posterior region pin (Fig. 1), while a transverse “break,” or cleft, 
divides the prothoracic trochantin into a basal region htn and a 
distal region, din , as is also the case in other roaches, mantids 
and termites, etc. In such cases, the small distal region din is 
usually interpreted as the entire prothoracic trochantin, al- 
through the basal portion htn also belongs to the prothoracic 
trochantin. The trochantin of all segments is closely associated 
with the pleural region (from which it is separated by the pleuro- 
ttochantinal suture p of Figs. 1 and 5) and it may be a detached 
portion of the pleural plate. On the other hand, it is maintained 
by several investigators that the trochantin (or even portions of 
the pleural plate itself) is a detached basal region of the leg, to 
which the term subcoxa is sometimes applied. 
Between the trochantin and the coxa is a small sclerite pac 
called the paracoxale, which bears an internal paracoxal tendon 
pat (Fig. 5) for muscle attachment. The sclerite pac is either a 
detached portion of the marginal region of the coxa, or it was 
formed in the membrane between the trochantin and coxa, to 
bear the internal tendon pat for muscle attachment. Behind the 
coxa is an internal tendon pt (Fig. 5) called the postcoxal tendon, 
to which are attached certain muscles. A faint “impress” 
marks its location externally. 
In the prothorax, a marginal region, the basicoxale be of Fig. 
1, is demarked in the basal region of the coxa. Its anterior 
region cm has been termed the coximarginale, and its posterior 
region me is homologous with the meron me of the other legs. 
An internal ridge, or endocoxa, demarks the region be internally, 
and serves for the attachment of muscles, as described by Dr. 
R. E. Snodgrass. In the meso- and metathorax, the meral 
region me 2 and me 3 is much more extensive than in the prothorax 
(i. e. me of Fig. 1), and a meral ridge, or endomeron mr of Fig. 5, 
serves to demark the meral region internally — and it also serves 
as a ridge for muscle attachment. The parts of the leg of a 
roach, together with their tendons, method of articulation, etc., 
have been described in a paper by Crampton, 1923 (Can. Ent. 
LV, p. 126), and need not be further discussed here, since the 
appendages of the thorax will be described more fully in a paper 
dealing with the legs and wings of the roach. 
