TAIU.1' OF COXTEXTS. 



PACE 



VI. The Abdomen 26 



I. The Various Subfamilies Compared. 2. The Visible Seg- 

 ments. 3. The Terminal Segments of Female and Worker. 

 4. The Terminal Segments of the Male. 



CHAPTER III. 



THE INTERNAL STRUCTURE OF ANTS. 



I. The Alimentary Tract 31 



II. The Glandular System 37 



III. The Reproductive Organs, Poison Apparatus and Repug- 



natorial Organs 39 



IV. The Circulatory System, Fat-body, CEnocytes, etc 46 



V. The Respiratory System 49 



XT. The Muscular System 49 



CHAPTER IV. 



THE INTERNAL STRUCTURE OF ANTS (CONCLUDED). 



I. The Nervous System in General 51 



II. The Brain 52 



i. Its Segmentation. 2. Its Finer Structure and the Signifi- 

 cance of the Pedunculate Bodies. 



III. The Ventral Xerve-cord 57 



IV. The Sympathetic Nervous System 58 



V. The Sense-organs 59 



I. Tactile Sensillae. 2. Olfactory and Gustatory Sensillae. 

 3. Chordotonal Organs. 4. The Johnstonian Organ. 5. 

 The Campaniform Sensillre. 6. The Lateral Eyes. /. The 

 Median Eyes, Stemmata, or Ocelli. 



CHAPTER V. 

 THE DEVELOPMENT OF ANTS. 



I. Behavior of Ants toward Their Young Contrasted with 



That of Other Hymenoptera 67 



1 1. The Nursing of the Brood 69 



