488 
NORTH AMERICAN PLECOPTERA 
Plate XXXI 
Fig. 20. — Pteronarcys dorsata Say. End of abdomen of cf nymph in left 
lateral view. 
Fig. 21. — Pteronarcys dorsata Say. End of abdomen of 9 nymph in left 
lateral view. 
Fig. 22. — Pteronarcys californica Newport. End of abdomen of cf nymph in 
left lateral view. 
Fig. 23. — Pteronarcys californica Newport. End of abdomen of 9 nymph in 
left lateral view. 
Fig. 24. — Pteronarcys proteus Newman. End of abdomen of c? nymph in 
left lateral view. 
Fig. 25. — Pteronarcys proteus Newman. End of abdomen of 9 nymph in 
left lateral view. 
Fig. 26. — Pteroiiarcys biloba Newman. End of abdomen of 9 nymph in left 
lateral view. 
Fig. 27. — Diagram to show arrangement of gills in genus Pteronarcys. 
Fig. 28. — Pteronarcella regularis Hagen. End of abdomen of adult c? in dorsal 
view. 
Fig. 29. — Pteronarcella regidaris Hagen. End of abdomen of adult 9 in ven- 
tral view. 
Plate XXXII 
Fig. 30. — Pteronarcella torosa new species. End of abdomen of adult cf in 
dorsal view. 
Fig. 31. — Pteronarcella triloba new species. End of abdomen of adult 9 in 
ventral view. 
Fig. 32. — Pteronarcella badia Hagen. End of abdomen of adult 9 in ventral 
view. 
Fig. 33. — Diagram to show arrangement of gills in genus Pteronarcella. 
Fig. 34. — Pteronarcella torosa new species. End of abdomen of cf nymph in 
left lateral view. 
Fig. 35. — Pteronarcella torosa new species. End of abdomen of 9 nymph in 
left lateral view. 
Fig. 36. — Pteronarcella riyraph.^ a,” . End of abdomen of 9 in left lateral view. 
Fig. 37. — Pteronarcella torosa new species. Outline of prothorax of nymph. 
Fig. 38. — Pteronarcella nymph “a”. Outline of prothorax. 
Fig. 39. — Protarcys dolobrata new species. End of abdomen of adult cf in 
ventral view. 
Fig. 40. — Protarcys bradleyi new species. Entire supra-anal plate of adult o' 
in left lateral view. 
Fig. 41. — Protarcys bradleyi new species. End of abdomen of adult cf in 
dorsal view. 
Fig. 42. — Protarcys bradleyi new species. End of abdomen of adult 9 in 
ventral view. 
