848 THE AMERICAN NATURALIST. [VOL. XXXIII, 
basal trachea. In the fore wings the trachez in the vein cavi- 
ties are seen in section. The pleura (%2) are seen overlying 
the bases of the wings. 
It is interesting to follow the basement membrane of the 
hypodermis throughout the section, noting how the hypodermal 
cells are elongated in certain parts, rounding out the sharp 
Diras st 
Gs ae 
2 =N C 
= 
niii molted, of ANa FNE i c, cuticle; 4m, basement mem bribe ; A, hypodermis ; the 
veins of the d by the res aiam A a small portion of the same, more 
highly aat. eg tabele. C, two hypodermal ‘ella from the same; D, base and apex 
of the fifth antecubital trachea, as seen in a? section, of aeran wing of the same speci- 
men; Sc, epithelium and intima of one side of subcostal trachea; a, 4, c, cells at origin o 
aceon, 7, td, tracheoles, 
angles of the exterior, and completely occupying the narrower 
spaces in the wings. 
It is also important to note that the basement membrane 
of the hypodermis of the wing differs in no respect from that of 
the hypodermis of the body wall, and is continuous with it. In 
the thinner parts of the wing the two basement membranes 
meet and fuse, thus forming what has been termed the middle 
