292 
Fig. 
56. 
ays 
. 58. 
SOs 
. 60. 
SGX. 
. 62. 
- 63. 
64: 
. 65. 
. 66. 
OT. 
. 68. 
ig. 69. 
- 70. 
ete 
AGED 
ergs 
BULLETIN OF THE BUREAU OF FISHERIES. 
The nymph of Potamanthus flaveola Walsh. 
An adult “ Peg-leg,’’ Campsurus sp.? (from Brazil), the extremely long tips of the tails omitted. 
Note the stubs of the vestigial middle and hind legs. 
Forceps and penes of Ephemera guttulata Pictet. 
Forceps and penes of Ephemera simulans Walker. 
Forceps and penes of Ephemera varia Eaton. 
Forceps and penis of Hexagenia bilineata, form bilineata Say. 
Forceps and penis of Hexagenia bilineata, form falcata n. nom. 
Forceps and penis of Hexagenia bilineata, form variabilis Eaton (syn., limbata Pictet). 
Forceps and penis of Hexagenia bilineata, form munda Eaton. 
Forceps and penis of Hexagenia bilineata, subimago, showing within the outline of the adult, 
form falcata. 
PLATE LXXXII. 
Chirotenetes siccus Walsh. 
The female subimago. 
Sketch of tails of male subimago to show their relative length. 
The female imago. 
Sketch of tails of male imago to show their relative length. 
Legs of one side of male imago. 
End of abdomen of adult male from beneath. 
The nymph from the side. Note the plancton-gathering fringes of the fore legs. 
The tail fin of the nymph; outer taiis fringed only on the inner side. 
a 
