LIST OF ILLUSTRATIONS. 



PLATES SEPARATELY PRINTED. 



PLATE FACING PAGK 



I. Eggs, larvae, and pupae of Ponera coarctata, Myrmecina gramini- 



cola, Solenopsis fugax, and Myrmica ruginodis ... 29 

 II. Eggs, larvae and pupae of Anergates atratulus, Monomorium 



pharaonis, Leptothorax interruptus, and Tetramorium caespitum 31 



III. Eggs, larvae, and pupae of Tapinoma erraticum, Donisthorpea 



nigra, and Formica rufa ....... 32 



IV. Ergatandromorph of Formica mfibarbis, and Gynandromorph of 



Formica sanguinea ........ 34 



V. Male, female, and worker of Ponera coarctata, P. punctatissima, 



and Myrmecina graminicola . . . . . .78 



VI. Male and female of Anergates atratulus, and male, female, and 



worker of Formicoxenus nitidulus and Monomorium pharaonis . 87 

 VII. Male, female, and worker of Solenopsis jugax and Myrmica sul- 



cinodis . . . .... . . . . 106 



VIII. Male, female, and worker of Leptothorax interruptus, L. acervorum, 



and Stenamma westwoodi ....... 144 



IX. Male, female, and worker of Tetramorium caespitum and Tapinoma 



erraticum ......... 178 



X. Male, female, and worker of Donisthorpea fuliginosa and D. aliena. 184 



XI. Carton nest of Donisthorpea fuliginosa and mounds of D. flava . 193 



XII. Nest of Donisthorpea umbrata ..... . . . . 228 



XIII. Nests of Formica rufa 250 



XIV. Nests of Formica rufa v. alpina and F. pratensis .... 266 

 XV. Male, female, and worker of Formica pratensis .... 268 



XVI. Nests of Formica pratensis and F. exsecta . . ... . 273 



XVII. Male, female, and worker of Formica ruftbarbis .... 320 



XVIII. Nests of Formica exsecta and F. picea 333 



FIGURES PRINTED IN THE TEXT. 



FIO. 

 1. 



2. 

 3. 

 4. 



5. 



Worker of Formica pratensis . 

 Underside of head of Formica pratensis 

 Mandible of Formica pratensis ^ 

 Maxilla of Formica pratensis ^ 

 Labium of Formica pratensis ^ 

 Thorax of Streblognathus aethiopicus <$ 



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