MAY FLIES AND MIDGES OF NEW YORK 327 



PLATE 31 



1 M e t r i o c 11 e in u s f 1 a v i f r o n s 



2 M e t r i o c n e m u s par 



3 M e t r i o c n e 111 u s luiidbeckii 



4 M e t r i <> c n e ui u s e x a g i t a n s 



5 M o t r i o c n e in us a 1 r a t u 1 u s 



6 C h a s in a t o n o t u s b i in a c u 1 a t u s (bead of male) 



7 Diamesa \v a 1 t 1 i i (antenna of female) 



8 O r t b o c 1 a d i u s ah s u r d u s ( antenna of female) 



!> A part of an egg string of S p b a e r o m y a s a r g e n t a t u s 



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 n s sp. i after Miall) 



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



13-14 A part of the egg string of < ' h i r o n o m u s dor sal is (after 



.Miall and Hammond) 



\~> A part of an egg string of (' b i r o n o m u s sp. 



16 Dorsal aspect of thorax of a male c b a s m a t on < i n s bimacula- 

 tus. x4o 



PLATE 32 

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



1 Bex/ia s e t n 1 o s a . Dorsal aspect. Male. xlOO 



2 Tanypus e u 1 i c i f o r m i s. Male. xKiO 

 .'! Ablabesuiyia monilis. Male. xlOO 



I Co r y n o n e u r a c e 1 e r i p e s (after Kieffer i 

 5 Diamesa p r a e c o x (after Kieffer) 



tj C b a s in a t o n o t n s l> i m a < u I a I u s. I >orsal aspect . Male, x.">0 

 7 ( ' b i r o n o m u s f 1 a v i e i n g u 1 a . Dorsal aspect. Male, \lnii 

 M ( ' b i r o n o m u s mo dest us. Dorsal aspect. Male. xH.'O 

 ! < ' b i r o n o m u s m o d e s t n s var. b. Latero-ventral aspect. Male. 

 xlOO 



10 ( ' li i r o n o in u s fulviveiltl'is. Male. xlOO 



] 1 C biro n o m us m o d e s t u s . Female, xloo 



12 C b i r o n o m u s flavus. Ventral aspect. Male, xloo 



13 C b i r o n o m u s d e c o r u s . I )orsal aspect. Male, x loo 



14 Diamesa waltlii. 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 O r t b o e 1 a d i u s k e r v i 1 1 i ( after Kieffer) 



2 r i c o t o p u s exilis. Male. xlOO 



3 T a n y tarsus dissimilis. Ventral aspect. Male, xlfio 



4 T a n y t a r s u s e x i g u u s . Ventral aspect. Male. x350 



4a T a n y t a r s u s e x i g u u s . Male. Latero-ventral aspect. xlOO 



5 T a n y t a r s u s dives. Mule. Dorsal aspect. xlOO 

 G Metriocnemus par. Male. Lateral aspect. xlOO 



7 Ortbocladius absurd us. Lateral aspect. Female. xlOO 



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



