COLLECTED AT BA.CHIAN, KAISAA, ETC. 143 



fascia ; the other segments with interrupted fasciae ; the ovipositor as 



long as the body. 

 Hab. Bachian. 



This is the most remarkable species of Ichneumon with which I am ac- 

 quainted : the extraordinary geniculation of the antennae near its apex is 

 the only instance of the kind that I have seen. By some, this might be 

 regarded as being of generic value. The difference of form in antennae in 

 the same genus has, however, several parallels ; I may instance the genus 

 Prosopis amongst the Apidce. In the form of the head, the tarsi, wings, 

 and general contour of the body, this is a true Xylonomus. 



EXPLANATION OF PLATE I. 



Fig. 1 . Megachile Pluto. 



2. Front view of the head of ditto, with mamlibles 0])ened to show 



the labrum. 



3. Pheidole notabUis, worker major. 



4. Ditto, worker minor. 



5. Echinopla praetexta. 



6. Amblyopone castanea. 



7. Cataulacus setosus. 



8. Podomyrma silvicola. 



9. Odontomachus seBvissimus. 



10. Mesoxena mistura. 



11. Maxilla and maxillary palpi of CEcophyltu smuraydina. 



12. Labium and labial palpi of ditto. 



13. Antenna of ditto. 



14. Scale of the petiole of Polyrhachis Churaxis. 



15. Ditto of P. Busiris. 



16. Ditto of P. Acantha. 



17. Ditto of P. Merops. 



18. Ditto of P. liJionus. 



19. Ditto of P. Eudora. 



20. Ditto of P. Metella. 



21. Side view of P. Metella. 



22. Scale of the petiole of P. Atropos. 



23. Ditto of P. Acasta. 



24. Ditto of P. Alphenus. 



25. Ditto of P. Sabella. 

 2G. J)itto oi P. ferv ens. 



All the figures are considerably magnified representations of the insects, 

 except that of Megachile Pluto, which is of the natural size. 



