324 



NEW YORK STATE MUSEUM 



Orthocladius nivoriundus 



18 Ventral aspect of labrum of larva : hi. lateral arm. xl50 



19 Antenna of larva. xlSO 



20 ]Manclible of lar^a. xl.50 



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



hypopharynx. xl50 



22 Dorsal aspect of abdominal segment of pupa. xSO 



23 Respiratoi-y organ of pupa. xfiO 



24 Caudal Jipju'iulage of pupa, x.35 



PLATE 25 

 Orthocladius fugax 



1 Mandible of larva. xl50 



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



palpus • hy, hypopharynx 



3 l.atero-veutral aspect of labrum of larva: a, anteuna ; ep, epipharynx ; 



c, lateral arm. xloO . 



4 Respiratory organ of pupa, xl.50 



5 A pectinate hair from anterior prolegs of larva. x400 



6 Caudal end of larva. xOO 



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. xlSO 



13 Antenna of larva. xlSO 



14 Ventral a.spoct of mouth parts of larva: 1. labium; nid, mandible; 



mx, maxilla ; p, palpus ; Ir, labrum. x2o0 



15 Lateral aspect of abdominal segment of pupa. xl50 



Tanytarsus dissimilis 



16 Ventral 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 asiXK?t of abdomen of pupa of variety a. xGO 



19 Comb of the lateral fin of the eiglith segnient of pupa. x250 



20 Dorsal aspect of the abdomen of pupa. xHO 



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. lalirum. x60 



2 Apical end of mandible of larva. x150 



3 Respiratoi-y organ of pui)a. xCO 



4 Ventral a^[>('<-t of niduth parts of lar\ a : 1. lahi\iiii ; mx, maxilla : p, 



palpus; jinx, inner lobe of maxilla; hy, hypopharynx. x250 



