494 NEW YOEK STATE MUSEUM 



6 Cross sectiton of hypopharynx. xllO 



7 Wing of male. xl5 



8 Thoracic respiratory filaments of pupa. xl5 



PliATB 37 



Simulium venustum. and varieties 



1 Maxilla of lairva. xllO 



2 Hypopharynx of larva, var. piscicidium. xllO 



3 Labrum of larva, venustum. xllO 



4 Respiratory filaments of pupa. x40 



5 Labium of larva, var. p 1 s c i cl d i u m . sl90 



6 Labium of larva, venustum. xl90 



7 EespiraAory filaments of pupa,- var. piscicidium. xllO 



8 Wing of imago, var. a 



9 Caudal appendages (blood gills) of larva, var. a. xllO 



10 Hypopharynx of larva, var. a. xllO 



11 Thoracic respiratory filaments of pupa, var. a. xllO 



12 I/abrum of larva, var. a. xllO 



13 Mandible of larva, var. a. xllO 



14 Labium of larva, var. a. xl90 



PLATE 38 



Legs. x50'; claws. xl90 



1 S. venustum (var. p i s c i c i d i u m). Hind tarsus of male 



2 S. venustum (var. plscicidiu m). Middle tarsus of male 



3 S. venustum (var. p i s cl c 1 d i u m). Fore tarsus of male 

 ■i S. venustum (var. a) Fore tarsus of female 



5 S. venustum (var. a) Middle tarsus of female 



6 S. venustum (var. a) Hind metatarsus of male 



7 S. pecuarum. Hind metatarsus of female 



8 S. pictipes. Hind mietatarsus of male 



■9 S. vittatum. Hind metatarsus of female 



10 S. h i r t i p e s . Hind metatarsus of female 



11 S. h i r t i p e s . Hind metatarsus of male 



12 S. m e r i d i o n a 1 e . Male and female metatarsus 



13 S. b r a c t e a t u m . Female metatarsus 



14 S. p e c u a r u mi . Claw of female 



15 S. bracteatum. Claw of female 



16 S. m e r i d i O' n a 1 e . Claw of female 



17 S. pictipes. Male ' 



18 S. meridionale. Male 



19 S. venustum, var. piscicidium. Female 



20 S. pictipes. Female 



21 S. o c h r a c e u m . Hind metatarsus of female 



PLATE 39 , 



Corethra plumicornis i 



1 Larva of C. plumicornis. xl2 



2 Pupa of same. xl2 



2(1 Breathing tube of pupa. xllO 



