202 EXPLANATION OF THE PLATES. 



Fig. 



21. Labial palpi of Formica exsecta, worker. 



22. Antennaj of Formica fusca, male. 



23. „ „ cunicularia, male. 



24. Abdomen of Formica virescens, male. 



25. Antenuse of Formica virescens, male. 



26. Scale of the petiole of Formica virescens, female. 



27. Lateral view of the scale of Formica virescens, female. 



28. Head of an Ant, showing the position of the frontal area 



at a. 



29. Head of an Ant, with the frontal area obsolete at a. 



30. Formica giyas, worker major, natural size. 



PLATE IV. 



1. Anterior wing of Polyeryus rnfescens, female. 



2. Head of Polyergus rnfescens, male. 



3. Scale of the petiole of Polyeryus rnfescens, male. 



4. Head of Polyeryus rnfescens, female. 



5. Antennae of Polyeryus rufescens, female. 



6. Labial palpi of Polyeryus rufescens, female. 



7. Maxillary palpi of Polyeryus rufescens, female. 



8. Scale of the petiole of Polyeryus rufescens, female. 



9. Mandible of Polyeryus rufescens, worker. 



10. Labial palpi of Polyrhachis. 



11. Maxillary palpi of Polyrhachis. 



12. Thorax of Polyrhachis mutatus, worker. 



13. Scale of the petiole oi Polyrhachis mutatus, worker. 



14. „ „ „ Gayates, worker. 



15. „ „ „ hastatus, worker. 



16. Thorax of Polyrhachis hastatus, worker. 



17. Scale of the petiole of Polyrhachis aciculatus, worker. 



18. Thorax of Polyrhachis aciculatus, worker. 



19. „ „ bihamatus, worker. 



20. Thorax and abdomen oi Polyrhachis furcatus, worker. 



21. Scale of the petiole of Polyrhachis laboriosus, worker. 



22. ,, „ ), „ worker: lateral view. 



23. „ „ „ constructor, worker. 



24. „ „ „ piliventris, worker. 



25. „ „ „ inermis, worker. 



26. Thorax of Polyrhachis inermis, worker. 



27. Scale of the petiole of Polyrhachis thfensus, worker. 



28. Lateral view of the scale of Polyrhachis rujipes, worker. 



29. Scale of the petiole of Polyrhachis tyrannicus, worker. 



30. Lateral view of the thorax and abdomen of Polyrhachis con- 



siynilis, worker. 



