1976] Bow dan — Functional Anatomy of Gerris remigis 293 
clature used by these three workers is given in table 1. 
Since in New England, adult G. remigis are usually wingless, 
only wingless animals were used in this study. Both direct and 
indirect flight muscles are lacking in the wingless animals and 
rather few muscles remain (Fig. 4), as follows: 
Muscle 40 (M. nototrochantinalis) is a coxal rotator. It origi- 
nates near the mid-line of the mesotergum and inserts directly 
on the trochantin, a precoxal sclerite which has fused with 
the coxal rim. 
Figure 2: Internal view of the ventral exoskeleton of the mesothorax of G. 
remigis to show the relationship of the coxa to the mesothorax. The tergum 
and pleura have been dissected away 
c 
coxa 
f 
femur 
int m s t 
internal exoskeleton of the mesothorax 
pea 
pleurocoxal attachment 
s c 1 
suprocoxal lobes 
tr 
trochanter 
trn 
trochantin 
L 
left 
R 
right 
