6 
BULLETIN 780, U. S. DEPARTMENT OF AGRICULTURE. 
brown. It may be quite light, approaching a yellow, or it may be 
dark, approaching the red observed in the flesh of the ox. Stomachs 
of the lighter shades especially are translucent. 
The rather thick walls of the stomach (fig. 2) consist of an inner 
epithelial and an outer muscular portion. Between these is the 
LMcI 
Pmb 
Fig. 2. — Microscopic anatomy of alimentary canal of worker bee: A , cross section of stomach showing 
peritrophic membranes (Pmb); B, wall of stomach, more highly magnified, showing epithelial layer 
(EptJi), basement membrane (BM), and muscular portion; C, section of Malpighian tubule showing 
epithelium (Epih) and basement membrane (Bif); D, cross section of small intestine. This portion of 
the canal, the rectum, and the oesophagus have a heavily chitinized intima. (Snodgrass.) 
basement membrane. Both surfaces of the epithelial layer are 
irregular. This consists of epithelial cells (Eptli) varying in size and 
outline. Closely associated with the outer surface of the epithelial 
layer is the basement membrane (B21). In connection with its 
inner surface is the more or less indefinite intima (Int) which possibly 
