MAY FLIES AND MIDGES OF NEW YORK 323 



PLATE 23 

 Chironomus dorsalis 



1 Labium of larva (after r^riall and Hammond, 1900). xlOO 



Chironomus lobiferus 



2 Antenna of larva. xlOO 



3 Ventral aspect of larval head : 1, labium ; ms, 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. xtSO 



Chironomus decorus 



7 Mandible of larva. xl.50 



8 Labimn of larva. xlOO 



Pupa. x6 



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



comb; Ir, lateral arm. xl."/! 

 n Dorsal aspect of second ahdomiiial segment of pupa. x40 



12 .Vnal end of pupa. x40 



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



Chironomus (I) plumosus 



14 Spur of the lateral fin of ^iyhth segment of pupa. xlOO 

 1.1 Labium of larva. xl80 



16 Maxilla of larva : p, palpus. xl80 



PLATE 24 

 Cricotopus exilis 



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



palpus ; by, hypoiiharynx. x250 



2 A'entr.al aspect of the labrum. x250 



3 Caudal end of pu])a. xGO 



4 Mandible of larva. x250 



Cricotopus trifasciatus 



5 A'entral aspect of mouth parts of larva, labium and maxilla. xl.">0 



6 Mandible of larva. xl.50 



7 Lat<>ral aspect of abdominal segments of pupa. x35 



8 Respiratory organ of pupa, xl.50 



9 Lateral hair-tuft of larva. xl50 



10 Caudal end of pupa with the caudal our] if enclosed imago. x3.'i 



Orthooladius flavus 



11 Ilypopharynx of larva. x80 



12 Ventral aspect of mouth parts of larva: a antenna; nid. mandildo; 



mx, maxilla ; p. palpus ; 1, labium. xSO 



13 Respiratory organ of pupa. x60 



14 Ventral aspect of labrum of larv.i : In, lateral arm. x2."'.0 



15 Lateral aspect of the posterior cud of tlie seventh al>ilniniii;il segment 



of the pupa 



16 Caudal end of pupa. x25 



17 Larval case, natural size 



