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 Hydroptila perdita from beneath 



32 Apex of abdomen of Hydroptila perdita from above 



33 Apex of abdomen of Hydroptila perdita from side (some- 



what crushed) 



34 Penis of Hydroptila perdita 



35 Apex of abdomen of Ithytrichia clavata from above 



30 Dorsal plate of Hydroptila consimilis (dry example from 

 Belfrage Texas) 



37 Apex of abdomen of Oxyethira dualis 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 

 Ceratopogon sens. lat. 



1 Larva. x6 



2 Hypopharynx 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. x!80 



7 Ceratopogon sens. str. Thoracic prolegs of larva. x400 



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



9 Ceratopogon sens. str. Dorsal aspect of pupa. x!5 



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 



16 Sphaeromyas wing 



PLATE 18 

 Ceratopogon 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 



