60 
Psyche 
[April 
The ventral cervicals pgu and is of Figs. 1 and 5 are narrow, 
transverse sclerites, homologous with the sclerites called the 
postgulare and intersternite by Crampton, 1926. The lateral 
cervicals Ic of Figs. 1 and 5, are the largest neck plates, and each 
is made up of three parts, or subdivisions. The anterior sub- 
division ec bears a cephaliger eg or process which articulates 
with the occipital condyles occ of the head. The median lateral 
cervical ic touches its fellow of the opposite side in the median 
ventral line of the body, in the fashion characteristic of most 
roaches, mantids and termites. The posterior lateral cervical 
area poc is indexed and bears a small internal protuberance at 
the point / of Fig. 5. The small sclerite t of Figs. 1 and 5 may be 
included with the lateral, or with the dorsal, cervicals. The 
dorsal cervicals pr (Fig. 15) are small and unimportant, but the 
dorsal cervicals it are quite large and unite posteriorly to form a 
horse-shoe-shaped area bearing a pair of internal protuberances. 
The posterior dorsal cervicals (or postintertergites) bear the 
internal tendons et (Fig. 15) for muscle attachment. 
The sternal region of each thoracic segment (excepting the 
metathorax) contains three typical sternites or sternal sclerites 
as follows. The basisternite hs 1, bs 2, and 6s3, of Fig. 1, is the 
principal sternite and is usually connected with the episternal 
region es by a precoxal bridge pc. In the mesothorax and meta- 
thorax, the basisternum 6s2, and 5s3, of Fig. 1 is composed of an 
unpaired median portion and two lateral halves. 
The furcasternite (or furca-bearing sternite) /si, is subtra- 
pezoidal in the prothorax, but it is shaped like an inverted “Y” 
in the meso — and metathorax. The furcasternite fs (Fig. 1) 
bears the furcal pits, or furcacavse fp, which are the external 
manifestations of the invaginations forming the internal diapo- 
physes, or furca fu, of Fig. 5. These paired apophyses, or diapo- 
physes (furca), serve to hold the nerve chain in place, and they 
furnish attachment for muscles etc. Miall and Denny in their 
book on the cockroach failed to find the prothoracic furca fu of 
Fig. 5, but these structures are quite well developed in the pro- 
thorax, and are composed of a delicate shaft, or basifurca, and a 
broad distal portion, or distifurca, which extends to the apodeme 
ap of the pleural region. 
