318 NEW YORK STATE MUSEUM 



5 End of male abdomen of same from below 



6 End of male abdomen of C a e n i s h i 1 a r 1 s Say, from below. 



3 and 4 to same scale ; 5 and 6 to same scale 



PLATE 12 



Nymph of Polymitarcys albus Say 



DRAWINGS BY W. E. HOWAED 



1 Dorsal view of the nymph 



2 Mandible 



3 Maxilla 



4 The right fore leg 

 o Labium 



Antenna 



7 A gill from the fourth abdominal segment 



8 Labrum 



PLATE 13 



1 Apex of abdomen of Hydroptila consimilis from beneath 



2 Apex of abdomen of Hydroptila consimilis from above 



3 Apex of abdomen of Hydroptila consimilis from side 



4 Another view of penis of Hydroptila consimilis 



5 Apex of abdomen of Hydroptila delineatus from beneatli 



6 Apex of abdomen of Hydroptila delineatus from side 



7 Apex of abdomen of Hydroptila delineatus latere dorsal 



aspect 



8 Apex of abdomen of H y d r o p t i 1 a s p a t u 1 a t a from beneath 



9 Dorsal of plate of Hydroptila s p a t u 1 a t a from above (not 



quite satisfactory) 



10 Apex of abdomen of Hydroptila spatulata from side 



11 Apex of abdomen of Hydroptila hamata from beneath 



12 Apex of abdomen of Hydroptila hamata from above 



13 Apex of adbomeu of Hydroptila hamata from side 



PLATE 14 



14 Apex of abdomen of Ithytrichia clavata from beneath (not 



satisfactory) 



15 Apex of abdomen of Ithytrichia clavata from side 



16 Apex of abdomen of Ithytrichia c o n f u s a from above 



17 Apex of abdomen of Ithytrichia c o n f u s a lat'ero venti-al 



aspect 



18 Apex of abdomen of Orthotrichia brachiata from beneath 



19 Apex of abdomen of Orthotrichia brachiata from side (not 



satisfactory) 



20 Apex of abdomen of O x y e t h i r a c o c r c e n s from beneath 



21 Apex of abdomen of O x y c t h i r a c o e r c e n s from above 



22 Apex of abdomen of O x y e t h i r a c o e r c e n s from side 



23 Apex of abdomen of O x y e t h i r a v i m i u a 1 i s from beneath 



24 Apex of abdomen of N e o t r i c h i a c o 1 1 a t a from beneath 



25 Penis of Neotrichia collata 



26 Apex of penis of Neotrichia collata, another view 



27 Fore wing of Neotrichia collata 



28 Hind wing of Neotrichia collata 



