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Transactions of the Academy of Science of St. Louis 
EXPLANATION OF PLATES 
PLATE I 
Podura aquatica 
Specimen, X-30 2. Distal half of furcula, X-120 
Onychiurus subtenuis 
Specimen, X-33 5. Hind claw, X-220 
Antenna, X-220 6. Hind claw, X-220 
Achorutes armatus 
Specimen, X-40 
Isotoma cinerea 
Hind claw, X-110 11. Hind claw, X-110 
Thorax and abdomen, X-38 12. Hind claw, X-100 
Head, X-38 13. Mucro, X-110 
Pseudosinella violenta 
Antenna, X-80 16. Hind claw, X-130 
Furcula, X-80 17. Mucro, X-130 
Folsomia fimetaria 
Specimen, X-42 20. Hind claw, X-110 
Hind claw, X-110 21. Furcula, X-110 
Isotomurus palustris 
Specimen, X-42 25. Hind claw, X-130 
Dorsal markings of speci- 26. Mucro, X-130 
men, X-15 27. Mucro, X-130 
Eye-spot showing eyes, 28. Furcula, X-80 
X-140 
Ptenothrix unicolor 
Specimen, X-40 31. Hind claw, X-140 
Mucro, X-140 
Entomobrya assuata 
Dorsal view of specimen, 34. Elongated gall of 
black locust twig, 
Hind claw, X-140 35. Mucro, X-140 
