54 Wisconsin Academy of Sciences, Arts and Letters. 
EXPLANATION OF PLATE I. 
All figures except general dissections were drawn with a camera 
lucida. Magnifications in diameters are given after the explanation 
of each figure. 
Fig. 1. Epipharynx, and pharynx with dorsal wall not shown:— 
vp, ventral plate of pharynx; Im, bundles of longitudinal muscles 
which are inserted at the base of each side of the epipharynx; 
pi, prolongations of posterior part of pharynx, (x 40.) 
Fig. 2. Dissection showing dorsal view of alimentary canal:— pit, 
pharynx; vm, vertical muscles; oes, oesophagus; c, crop; g, gizzard; 
md, mid-intestine; il, ileum; mlp, Malpighian tubules; r, rectum; rg, 
rectal glands, (x 4.) 
Fig. 3. Cephalic integument of head removed, showing the pharynx 
and brain:— m, mandible; eph, epipharynx; ph, pharynx; fcr, brain; 
cp, compound eye; oc, three ocelli; fr, frontal ganglion; a, antennal 
lobe, (x 6.) 
Fig. 4. Cross section of oesophagus near pharynx, showing the large 
dorsal fold:— ch, chitinous intima; ep, epithelium; ilm, longitudinal 
muscles; cm, circular muscles; gla, multinucleated gland; pc, pores 
which penetrate the chitinous intima. (x 216.) 
