xx LIST OF ILLUSTRATIONS 



FIG. PAGE 



21. Genitalia of Sericostoma personatum, <J (Welsh- 



man's button), from the side . . .50 



22. Pupal grating of Sericostoma personatum, the 



Welshman's button . . . . .51 



23. Genitalia of Notidobia ciliaris, $ , from the side 52 



24. Goera pilosa, <J , maxillary palpus . . 53 



25. Genitalia of Go'era pilosa, $ , from above . . 54 



26. Genitalia of Silo nigricornis, <J , from above . 54 



27. Larvae of Brachycentrus subnubilus (grannom) 



emerging from the eggs . . . . 55 



28. Genitalia of Brachycentrus subnubilus, <J (gran- 



nom), from beneath . . . . -56 



29. Pupal grating of Brachycentrus subnubilus, 



the grannom . . . . . -57 



30. Genitalia of Lepidostoma hirtum, $ , from above 58 



31. Odontocerum albicorne,6, portion of antenna, 



highly magnified 59 



32. Genitalia of Laptocerus cinereus, <j , from the side 60 



33. Hooks connecting the anterior and posterior 



wings of Mystacides nigra . . . .62 



34. Genitalia of Mystacides nigra, <J , from above . 62 



35. Genitalia of Hydropsyche guttata, . . .64 



36. Genitalia of Poly centr opus flavomaculatus, & , 



from the side ...... 65 



37. Genitalia of Ryacophila dorsalis, 6 , from the 



side. Dorsal plate 67 



38. Genitalia of Agapetus fuscipes, <J , from above 68 



39. Genitalia of Glossosoma vernale, $ , from the side 69 



40. Perla maxima, 9 , hind-wing . . . 72 



41. Perla cephalotes, 9 , hind-wing . . .73 



42. Genitalia of Leuctra geniculata, <J , from above 75 



43. Wings of Leuctra hippopus, (J . . . . 76 



