324 NEW YORK STATE MUSEUM 



Orthocladius nivoriundus 



18 Ventral aspect of labrum of larva : la, lateral arm. x!50 



19 Antenna of larva. x!50 



20 Mandible of larva. x!50 



21 Ventral aspect of mouth parts of larva : 1, labiurn ; mx, maxilla ; by, 



bypopbarynx. x!50 



22 Dorsal aspect of abdominal segment of pupa. x80 



23 Respiratory organ of pupa. x60 



24 Caudal appendage of pupa. x35 



PLATE 25 

 Orthocladius fugax 



1 Mandible of larva. x!50 



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



palpus ; by, hypopharynx 



3 Latero-ventral aspect of labrum of larva : a, antenna ; ep, epipharynx ; 



c. lateral arm. x!50 



4 Respiratory organ of pupa. x!50 



5 A pectinate hair from anterior prolegs of larva. x400 



6 Caudal end of larva. x60 



7 Lateral aspect of second, third and fourth abdominal segments of pupa. 



x60 



8 Claw of posterior proleg of larva. x250 



9 Peripheral claw of posterior proleg of larva. x250 



11 Dorsal aspect of fifth abdominal segment of pupa 



Orthocladius sordidellus 



12 Ventral aspect of labrum of larva. x!80 



13 Antenna of larva. x!80 



14 Ventral aspect of mouth parts of larva : 1, labium ; md, mandible ; 



mx, maxilla ; p, palpus ; Ir, labrum. x250 



15 Lateral aspect of abdominal segment of pupa. x!50 



Tanytarsus dissimilis 



16 Ventral aspect of mouth parts of larva: 1, labium; md, mandible; 



mx, maxilla ; p, palpus ; Ir, labrum. x250 



17 Antenna of larva. x250 



18 Dorsal aspect of abdomen of pupa of variety a. x60 



19 Comb of the lateral fin of the eighth segment of pupa. x250 



20 Dorsal aspect of the abdomen of pupa. xGO 



21 Comb of lateral fin of eighth segment of pupa. x250 



Cricotopus varipes 



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



p, palpus 



PLATE 26 



Tanytarsus dives 



1 Dorsal aspect of head of larva : a, antenna ; Ir, labrum. x60 



2 Apical end of mandible of larva. x!50 



3 Respiratory organ of pupa. xGO 



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



palpus ; imx, inner lobe of maxilla ; by, hypopharynx. x250 



