220 Proceedings of the Royal Physical Society. 



1893. ScHOTT, H., Zur Systematik und Verbreitung palaearbischer 



Colleiiibola, K. Svensk. Vet.-Akad. Handl.y vol. xxv., 



No. 11, 1893. 

 1902. ScHOTT, H., Etudes sur les Collemboles du Nord, Bihang 



till K. Svensk. Vet.-Akad. Handt., vol. xxviii., Afdel iv., 



No. 2, 1902. 

 1872. TuLLBERG, T., Sveriges Podurider, K. Svensk. Vet.-Akad. 



Handl., vol. x., No. 10, 1872. 



EXPLAXATION OF PLATE IV. 



Fig. 1. Isotoina sexoculata, Tiillberg; x 42. 



Fig. 2. ,, ,, ,, Left feeler, post-antenual organ and 



ocelli; x 185. 

 Fig. 3. ,, ,, ,, Hind foot; x 370. 



Fig. 4. ,, ,, ,, Spring; x 185. 



Fig. 5. Achor utes mcmubrialis, TuWherg; x 55. 



Fig. 6. ,, ,, ,, Post-antennal organ ; x 185. 



Fig. 7. ,, ,, ,, Hindmost abdominal segment; 



X 185. 

 Fig. 8. „ ,, „ Hind foot; x 370. 



Fig. 9. ,, ,, ,, Dens and mucro of spring ; x 185. 



Fig. 10. Achorutcs pi'opinquus, sp. nov. ; x 65. 

 Fig. 11. „ ,, Anal region, showing spines and bristles, 



side view; x 185. 

 Fig. 12. ,, ,, Anal spines from above; x 185. 



Fig. 13. ,, ,, Foot of third pair ; x 520. 



Fig. 14. ,, ,, Dens and mucro of spring, side view; x 520. 



