MAY FLIES AND MIDGES OF NEW YORK 323 



PLATE 23 

 Chironomus dorsalis 



1 Labium of larva (after Miall and Hammond, 1900). xlOO 



Chironomus lobiferus 



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. x40f) 



Chironomus sp. (83) 



6 Labium of larva. xlSO 



Chironomus decorus 



7 Mandible of larva. xl.~,<i 



8 Labium of larva. xlOO 



Pupa. xO 



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



comb ; lr, latera 1 arm. .\ l.'id 



11 Dorsal aspect of second abdominal segment of pupa. x4o 



12 Anal end of pupa, x-lu 



13 Labium of larva (of another variety or possibly species). \1^<> 



Chironomus (?) plumosus 



14 Spur of the lateral fin of eighth segment of pupa, xluo 

 !" Labium of larva. xlSO 



1<; Maxilla of larva : p, palpus. xlSO 



PLATE 24 

 Cricotopus exilis 



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



palpus; by. hypopharynx. x2f>o 



2 Ventral aspect of the labrum. x2. r >o 



3 Caudal end of pupa. xf.O 



4 Mandible of larva. x2r.o 



Cricotopus trifasciatus 



5 Ventral aspect of mouth parts of larva, labium and maxilla. x1:">0 

 Mandible of larva. x!50 



7 Lateral aspect of abdominal segments of pupa. x.3o 



8 Respiratory organ of pupa. xl5u 

 Lateral hair-tuft of larva. xl.'u 



10 Caudal end of pupa with the caudal end >f enclosed imago, x .".'> 



Orthocladius flavus 



11 IIy|K)i>harynx of larva. xSO 



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



mx, maxilla : p. palpus ; 1, labium. xS<> 



13 Respiratory organ of pupa. x(i() 



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



l."> Lateral aspect of the posterior end of the seventh abdominal segment 



of the pupa 



in Caudal end of pupa. x25 

 IT Larval case, natural size 



