TABLE OF CON TEXTS. xxi 



CHAPTER XXII. 

 TRUE GUESTS, Ecro- AND ENTOPARASITES. 



PAGE 



1. General Characteristics of the Relations of the True Guests 



and Parasites to the Ants 398 



II. The Symphiles Structural Adaptations 398 



i. Symphilic Coloration. 2. Trichomes. 3. Mouth-parts. 4. 

 Antenna?. 



III. Typical Symphiles 402 



i. The Paussidse. 2. The Gnostidas, Ectrephida?, and Cossy- 

 phodidae. 3. The Clavigerida; and Pselaphidae. 4. The 

 Lomechusinae. (a) Summary of Life History. (b) 

 Pseudogynes. 5. Critique of Wasmann's Theories of 

 " . \mical Selection " and " Special Symp.hylic Instincts." 



IV. Ectoparasites 412 



i. The Phorid Metopina. 2. The Gamasid Antenna phorus, 

 etc. 3. The Sarcoptid Tyroglypluts. 4. The Thorictidse. 

 5. The Chalcididse. 



V. Entoparasites 419 



i. Coleoptera. 2. Diptera. 3. Hymenoptera. 4. Nematodes. 



VI. Comparison of Modifications of Hosts Induced by the Three 



Classes of Parasites 421 



VII. Myrmecophags and Myrmecoids 422 



CHAPTER XXIII. 

 THE COMPOUND NESTS. 



I. Social Symbiosis 423 



i. Definition. 2. Classification. (a) Compound Nests. (ft) 

 Mixed Colonies. 



II. Types of Social Symbiosis in Compound Nests 424 



i. Plesiobiosis. 2. Parabiosis. 3. Cleptobiosis. 4. Lesto- 

 biosis. (a) Pheidole calcns. (b) Solenopsis fugax. (c} 

 Diplomornim longifcnnc. (d) Carcbara ridna, etc. (r) 

 Other Lestobiotic Ants. 5. Phylacobiosis. 6. Xenobiosis. 

 (a) Formicoxenus nitiduhts. (&) Formicoxenus ravoiuci 

 and corsicus. (c) Xenomyrmcx stolli. (d) Phacota 

 sichcli and noualhicri. (r) Myrmoxenus gordiagini. (/) 



