362 ERNEST WARREN. 



Fig. 42. — X 225. Vertical section of portion of head and prothoracic 

 shield of Termitodiscus splendidus Wasm. Given for comparing 

 the structure of the eye. Note abundance of pigment, degenerate 

 optic plate almost separated from optic ganglion, and the encroaching 

 cuticle tending to cut off the eye. 



Fig. 43. — x 55. Side view of central nervous system of Paracoro- 

 toca akermani. Note tritoeerehrum with large tracheal tube. 



Fig. 44. — X 85. Side view of central nervous system of Termito- 

 mimus entendveniensis Tri'tgh. Given for comparison. 



PLATE XVIII. 

 Fig. 45. — X 65. Semi-diagrammatic vertical longitudinal section of 

 female Paracorotoca beetle. The numbering of the segments is 

 based on the supposition of ten abdominal segments. 



PLATE XIX. 



Fig. 46. — x 100. Dorsal view of central nervous system of Para- 

 corotoca. Note tritocerebrum (tri.), large tracheal tube, oesophageal 

 ganglion (r. os. f/.), frontal ganglion if.g.). 



Fig. 47. — X 100. Side view of brain and subcesophageal ganglion. 



Fig. 48. — X 100. Ventral view of brain and subcesophageal ganglion. 



Fig. 49. — x 170. Vertical cross-section of front portion of optic 

 ganglion, showing peculiar small, solid nuclei {d. c.) without cell outlines, 

 possibly indicating degeneration associated with the abortion of the eye. 



Fig. 50. — x 170. Vertical section a little behind that of fig. 49, 

 showing the beginning of the antennary lobe (". I.). 



Fig. 51. — X 170. Vertical section through the pi'ocerel^ral lobes and 

 front portion of subcesophageal ganglion, showing origin of mandibular 

 nerve. 



Fig. 52. — x 250. Vertical section through brain and compound eye 

 of Termitodiscus splendidus Wasm. Bleached with chlorine. 



Fig. 53. — X 170. Vertical cross-section through the middle of the 

 procerebral lobes. Note the scarcity of nerve-cells or cortex, the 

 medulla (me.) forming the bulk of the structure. The origin of nerve 

 to maxilla 1 is seen. 



Fig. 54. — X 170. Vertical cross-section near the posterior vertical 

 face of procerebral lobes. Note the trabecula {fi-. b.). calyx icy.), 

 cauliculus (ca.), and bridge {b.) of procerebral lobes. The origin of 

 labial nerve (l. n.) is seen. 



Fig. 55. — x 170. Cross-section immediately behind that of fig. 54, 



