MAY FLIES AND MIDGES OF NEW YORK 321 



PLATE 20 



Procladius adumbratus 



1 Ventral aspect of head of larva : a, antenna ; md, mandible ; mx, 



maxilla ; p, palpus ; 1, labium ; h, hypopbarynx ; x, lateral process. xl80 



2 Slender claw of posterior proleg. xl80 



3 Stout claw of posterior proleg. xl80 



4 Caudal appendage of pupa. x40 



5 - Respiratory organ of pupa. xlOO 



Ablabesmyia carnea 



6 Ventral aspect of head of larva : a, antenna ; md, mandible ; mx, max- 



illa ; p, palpus ; 1, labium ; h, hypopbarynx ; x, lateral process. xl80 



7 Respiratory organ of pupa. xlOO 



8 Caudal appendage of pupa. x40 



Diamesa waltlii 



9 Ventral aspect of the head : md, mandible ; mx, maxilla ; p, palpus ; 



ulr, labrum ; la, lateral arms ; 1, labium ; by, hypopbarynx 



Chironoraus sens. lat. sp. 

 10 Dorsal aspect of head: ds, dorsal sclerite ; a, antenna (wanting); 

 b, frontal process 



PLATE 21 

 Chironomus tenellus 



1 Ventral aspect of head of larva : ulr, labrum ; la, lateral arms ; md, 



mandible ; mx, maxilla ; p, palpus ; 1, labium. xl50 



2 Caudal end of pupa. x60 



3 Lateral aspect of the fifth abdominal segment of pupa. x60 



4 Antenna of larva. xl50 



Chironomus nigricans 



5 Antenna of larva. xloO 



G Ventral aspect of head of larva : 1, labium ; hy, hypopbarynx ; mx, 

 maxilla ; imx, inner lobe of maxilla ; p, palpus. xl50 



7 Mandible of larva. xl50 



8 x\nterior prolegs of larva. x25 



9 Posterior end of larva. x25 



10 Epipharynx of larva : an, anterior comb ; c, posterior comb. x250 



11 Dorsal aspect of second and third abdominal segments of pupa. x25 



12 Comb at caudal end of lateral fin of eighth segment of pupa. x60 



Chironomus flavicingula 



13 Ventral aspect of epipharynx of larva, distended: f, posterior comb; 



s, curved setae. x250 



14 Ventral aspect of labrum: a, epipharynx (shown enlarged in fig.l3). 



xl50 



15 Dorsal aspect of labrum. x250 



16 Dorsal aspect of third segment of pupa. x25 



17 Lateral fin of eighth segment of pupa. x60 



18 Labium of larva. xl50 



19 Ventral aspect of mouth parts of larva : 1, labium ; mx, maxilla ; p, 



palpus; hy, hypopbarynx 



