ILLUSTKATIONS. 7 



Page. 



Fig. 42. Alimentary canal of worker 85 



43. Details of pharyngeal and salivary glands 88 



44. Honey stomach of worker, queen, and drone 94 



45. Longitudinal section of honey stomach and proventriculus of queen . 97 



46. Histological details of alimentary canal of worker 103 



47. Dorsal diaphragm of drone, from one segment 108 



48. Small j^art of dorsal diaphragm of drone 110 



49. Pericardial chamber of one segment in worker Ill 



. 50. Tracheal system of worker 113 



51. Tracheal system of worker 117 



52. Nervous system of worker 123 



53. Brain and sub oesophageal ganglion of worker 125 



54. Horizontal section of compound eye and optic lobe cf worker 127 



55. Histological details of compound eye of worker 128 



56. Reproductive organs of drone 133 



57 . Reproductive organ and sting of queen 135 



