324 NEW YORK STATE MUSEUM 



Orthocladius nivoriundus 



18 Venti'al aspect of labnnu of larva : !a, lateral arm. xl50 



19 Antenna of larva. xl50 . 



20 :Mandible of larva. xl50 



21 Ventral aspect of mouth parts of lar^a : 1, labium ; mx, maxilla ; hy, 



hypopliarynx. xl50 



22 Dorsal aspe<?t of abdominal .*egment of pupa. xSO 



23 Respiratoi'y organ of pujia. x()() 



24 Caudal appendage of pupa. x35 



PLATE 25 

 Orthocladius fugax 



1 Mandible of larva. xloO 



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



palpus ; hy, hypopliarynx 



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



c, lateral arm. xloO 



4 Respiratory organ of pupa. xl50 



5 A pectinate hair from anterior prolegs of larva. x400 

 G Caudal end of larva. xOO 



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



x60 



8 Claw of posterior prolog of larva. x250 



9 Peripheral claw of posterior prolog of larva. x250 



11 Dorsal aspect of fifth abdominal segment of pupa 



Orthocladius sordidellus 



12 Ventral aspect of labrum of larva. xlSO 



13 Antenna of larva. xlSO 



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



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



15 Lateral aspect of abdominal segment of pupa. xloO 



Tanytarsus dissimilis 



16 A''entral aspect of mouth parts of larva: 1, labium; md, mandible; 



mx, maxilla ; p, palpus ; Ir, labrum. x2r)0 



17 Antenna of larva. x250 



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



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



20 Dorsal aspect of the abdomen of pupa. x60 



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



Cricotopus varipes 



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



p, palpus 



PLATE 26 

 Tanytarsus dives 



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



2 Apical end of mandible of larva. xl.50 



3 Respiratory organ of pui)a. xdO 



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



palpus; imx, inner lobe of maxilla; hy, hypopliarynx. x250 



