EXPLANATION OF PLATES 



Plate 1 

 Tetracanthella wahlgreni: 



1. Specimen, X 42. 



2. Eyes and postantennal organ of right side, X 252. 



3. Sense organ of third antennal segment of left side, X 825. 



4. Left hind foot, X 505. 



5. Extremity of abdomen, X 185. 



6. Dorsal aspect of anal spines, X 250. 



7. Furcula and tenaculum, X 505. 



8. Dorsal aspect of mucrodentes, X 505. 



9. Dorsal setae of first abdominal segment, X 295. 



Plate 2 

 Anurophorus laricis: 



10. Specimen, X 65. 



11. Eyes and antennal base of left side, X 302. 



12. Postantennal organ and adjacent eyes of right side, X 397. 



13. Sense organ of third antennal segment of right side, X 847. 



14. Right hind foot, X 888. 



15. Dorsal setae of first abdominal segment, X 275. 

 Folsomides parvus: 



16. Specimen, X 106. 



17. Eye patches, postantennal organ, and first antennal segment of right 



side, X 535. 



18. Right hind foot, X 881. 



19. Right aspect of ventral tube, X 307. 



20. Right aspect of furcula, X 535. 

 Folsomides stachi: 



21. Eye and postantennal organ of left side, X 926. 



22. Right midfoot, X 1,411. 



23. Right hind foot, X 1,322. 



Plate 3 



Folsomides stachi: 



24. Right aspect of furcula, X 941. 



25. Dorsal aspect of furcula, X 941. 



26. Extremity of mucrodens, X 1,991. 

 Isotomodes tenuis: 



27. Specimen, X 93. 



28. Left postantennal organ, X 594. 



29. Sense organ of third antennal segment of left side, X 1,880. 



30. Right hind foot, X 847. 



31. Right aspect of furcula, X 576; the manubrial hooks are on the left 



side of the dens. 



32. Left mucro, X 847. 



33. Right aspect of tenaculum, X 576. 



34. Dorsal setae of fourth abdominal segment, X 376. 



129 



