MAY FLIES AND MIDGES OF NEW YORK 327 



PLATE 31 



1 Metriocnemiis flavifrons 



2 Metriocnemus par 



3 Metriocnemus lundbeckii 



4 Metriocuenins exagitans 



5 Metriocnemus a t r a t n 1 u s 



6 Chasmatonotiis bimaciilatus ( head of male) 



7 Diamesa w a ] 1 1 i i (antenna of female) 



8 Orthocladius absurdus ( antenna of female) 



9 A part of an egg string of Sphaeromyas argentatus 



10 An egg mass of C b i r o n o m u s sp. x2 



11 An egg mass of T a n y p u s sp. (after Miall) 



12 A part of an egg string of C h i r o n o m u s sp. 



13-14 A part of the egg string of Cbironomus dorsalis ( after 

 Miall and Hammond) 



15 A part of an egg string of Cbironomus sp. 



16 Dorsal aspect of tborax of a male Chasmatonotus bimacula- 



t u s . x40 



PLATE 32 

 Genitalia : d, dorsal keel ; 1, lateral ; s, superior ; i, inferior lobe 



1 Bezzia setulosa. Dorsal aspect. Male. xlOO 



2 Tanypus culiciformis. Male. xlOO 



3 Ablabesmyia monilis. Male. xlOO 



4 Corynoneura celeripes ( after Kieffer ) 



5 Diamesa praecox ( after Kieffer ) 



G Cbasiiiatonotus bimaculatus. Dorsal aspect. Male. x50 



7 Cbironomus f 1 a v i c i n g u 1 a . Dorsal aspect. Male. xlOO 



8 Cbironomus modestus. Dorsal aspect. Male. xlOO 



9 Cbironomus modestus var. b. Latero- ventral aspect. Male. 



XlOO 



10 C b i r o n m u s f u 1 v i v e n t r i s . iMale. xlOO 



11 Cbironomus modestus. Female. xlOO 



12 Cbironomus flavus. Ventral aspect. Male. xlOO 



13 Cbironomus decor us. Dorsal aspect. Male. xlOO 



14 Diamesa wait Hi. Dorsal aspect. Male. x50 



PLATE 33 



Genitalia: d, dorsal keel"; 1, lateral lobe; s, superior lobe; i, inferior 

 lobe ; a, appendage of tbe superior lobe 



1 Ortbocladius k e r v i 1 1 i (after Kieffer) 



2 C r i c o t o p u s e x i 1 i s . Male. xlOO 



3 T a n y t a r s u s d i s s i m i 1 i s . Ventral aspect. Male. xl50 



4 Tanytarsus exiguus. Ventral aspect. Male. x350 



4a T a n y t a r s u s exiguus. Male. Latero-ventral aspect. xlOO 



5 Tanytarsus dives. Male. Dorsal aspect. xlOO 



6 Metriocnemus par. INIale. Lateral aspect. xlOO 



7 Ortbocladius absurdus. Lateral aspect. Female. xlOO 



8 Metriocnemus a t r a t u 1 u s (after Kieffer) 



