PLATE X. 
Fig. 1. — Frontal section 16, through the front of the brain of adult Caloptenua spretiu; 
X $ inch objective, A. eye-piece. 
Fio. 2. — Section 17, showing the central body (centr. b.) and mushroom hody, optic 
and antennal lobes, and commissural lobes; X i A. 
Fig. 3. — Enlarged view of the trabecula and its nerves, of the mushroom hody, its 
calices and stalk, and the origin of the optic nerves; for lettering see 
schedule. X i A., 225 diameters. 
Fig. 4. — Section 18, passing through the back of the central body, showing the double 
nature of the stalk of the mushroom body, and passing through the back 
of the commissural lobes and behind the trabecula and the base of the 
stalk ; X i A. Are oc. n. T the origins of the ocellar nerves? 
Fig. 5. — Vertical (longitudinal) section through one of the hemispheres, showing the 
origin of the commissural and antennal nerves and the optic lobe. 
Fig. 6. — Longitudinal section through the brain and subcesophageal ganglion (X 50 
diameters), showing the two portions of the calyx, the antennal lobe, and 
in the subcesophageal ganglion the three lobes giving off respectively the 
mandibular, maxillary, and labial nerves. 
Fig. 7. — Longitudinal section through the optic ganglion and the eye ; X 50 diameters. 
Fig. 8. — Longitudinal section through the brain, showing the calyx, antennal lobes, 
and commissural lobes ; X 50 diameters. 
Fig. 8a. — Enlarged view of Fig. 8 (X •} B.), showing the relations in a longitudinal 
section of the calyx to the stalk, although the direct connection of the 
stalk with the calyx is not seen in this section. 
