MAY FLIES AND MIDGES OF NEW YORK 319 



PLATE 15 



29 Head of Neotrichia collata 



30 Apex of abdomen of Neotrichia collata from above 



31 Apex of abdomen of H y d r o p t i 1 a p e r d i t a from beneath 



32 Apex of abdomen ofHydroptila perdita from above 



33 Apex of abdomen ofHydroptila perdita from side (some- 



what crushed) 



34 Penis of H y d r o p t i 1 a perdita 



35 Apex of abdomen of Ithytrichia clavata from above 



3G Dorsal plate of Hydroptila consimilis (dry example from 

 Belfrage Texas) 



37 Apex of abdomen of O x y e t h i r a d u a 1 i s from beneath 



38 Apex of abdomen of Oxyethira dualis from above 



39 Apex of penis of Oxyethira dualis 



PLATE 16 

 Chironomus sp. 



1 Adult male. x6 



2 Pupa 



3 Head of adult female 



4 Larva (the second and third segments coalescent) 



5 Frontal aspect of larval head 



PLATE 17 

 Ceratopogron sens. lat. 



1 Larva. x6 



2 Hypoph-arynx of larva. xlOO 



3 Caudal end of larva. xlOO 



4 Ceratopogon sens. str. Larva. xlO 



5 Ceratopogon sens. str. Body segment of larva. x40 



6 Ceratopogon sens. str. Mandible of larva. xl80 



7 Ceratopogon sens. str. Thoracic prolegs of larva. x4(X) 



8 Ceratopogon sens. str. Claw of hind proleg of larva. x400 



9 Ceratopogon sens. str. Dorsal aspect of pupa. xl5 



10 B e z z i a sp. Dorsal aspect of labium, maxilla and its palpus 



11 B e z z i a sp. Ventral aspect of pupa 



12 B e z z i a sp. Thoracic respiratory organ of pupa. xlOO 



13 Brachypogon wing 



14 Ceratopogon sens, str., wing 



15 B e z z i a wing 



10 S p h a e r m y a s wing 



PLATE 18 

 Ceratopogron sens. lat. 



1 Dorsal aspect of labrum of larva ; a, antenna ; b, papilla. x400 



2 Dorsal aspect of labium and maxilla of larva ; p. palpus. x400 



3 Lateral aspect of head of larva ; m, mandible ; a, antenna. xlOO 



Bezzia setulosa 



4 Mandible of larva. x400 



5 Hypopharynx of larva. x400 



6 Dorsal aspect of labium of larva. x400 



