MAY FLIES AND MIDGES OF NEW YORK 323 



PLATE 23 

 Chironomus dorsalis 



1 Labium of larva (after JNIiall and Hammond; 1900). xlOO 



Chironomus lobif erus 



2 Antenna of larva. xlOO 



3 Ventral aspect of larval head : 1, labium ; mx, maxilla ; p, palpus ; 



f, fan-like membrane. xlOO 



4 Lobe of an abdominal segment of the imago. xlOO 



5 Comb of the lateral fin of the eighth segment of the pupa. x400 



Chironomus sp. (83) 



6 Labium of larva. xlSO 



Chironomus decorus 



7 Mandible of larva. xl50 



8 Labimn of larva. xlOO 

 n Pupa. x6 



10 Ventral aspect of labrum of larva ; an, anterior comb ; c, posterior 



comb; Ir, lateral arm. xl50 



1 1 Dorsal aspect of second abdominal segment of pupa. x40 



12 Anal end of pupa. x40 



13 Labium of larva (of another variety or possibly species). xlSO 



Chironomus (?) plumosus 



14 Spur of the lateral fin of eighth segment of pupa. xlOO 

 1.") Labium of larva. xlSO 



K) Maxilla of larva : p, palpus. xlSO 



PLATE 24 



Cricotopus exilis 



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



palpus ; hy, hypopharynx. x2')0 



2 Ventral aspect of the labrum. x25n 



3 Caudal end of pupa. xOO 



4 Mandible of larva. x250 



Cricotopus trifasciatus 



5 Ventral aspect of mouth parts of larva, labium and maxilla, xl.^0 

 G Mandible of larva. x1.50 



7 Lateral aspect of abdominal segments of pupa. x35 

 S Respiratory organ of pupa. xl.50 

 Lateral hair-tuft of larva. xl50 



10 Caudal end of pupa with the caudal enrl )f enclosed imago. x3.'i 



Orthocladius flavus 



11 Hypopharynx of larva. x80 



12 Ventral aspect of mouth parts of larva: a antenna: md, mandible; 



mx, maxilla ; p, palpus : 1. labium. x8<) 



13 Respiratory organ of pupa. x60 



14 Ventral aspect of labrum of larva: la. lateral arm. x2.")0 



l."» Lateral aspect of the posterior end of the scvent)i abdominal segment 



of the pupa 

 If) Caudal end of pupa. x25 

 17 Larval case, natural size 



