MAY FLIES AND MIDGES OF NEW YORK 327 



PLATE 31 



1 ]\I e t r i c n e m n s f 1 a v i f r o u s 



2 Metrioenemus par 



3 Metrioenemus lundbeckii 



4 M e t r i o c u e ni -.1 s e x a g i t a n s 



5 Metrioenemus a t r a t u 1 u s 



6 Chasm atonotus bimaculatus ( bead of male) 



7 D i a in e s a w a 1 t 1 i i (antenna of female) 



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



9 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 



13 An egg mass of T any pus sp. (after Miall) 

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



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

 Miall and Hammond) 



15 A ]jart of an egg string of Cbironomus sp. 



16 Dorsal aspect of thorax of a male Chasm atonotus bimacula- 



tus. x40 



PLATE 32 

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



1 Bezzia setulosa. Dorsal aspect. Male. xlOO 



2 T a n y p u s c u 1 i c i f o r m i s . Male. xlOO 



3 Ablabesmyia monilis. Male. xlOO 



4 Corynoneura celeripes ( after Kieffer ) 



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



G C b a s Ju a t o n t u s b 1 m a c u 1 a t u s . Dorsal aspect. Male. x50 



7 C h i r o u o m us f 1 a v i c i n g u 1 a . Dorsal aspect. Male. xlOO 



S Cbironomus modestus. Dursal aspect. Male. xKJO 



9 C h i r o n o m us modestus var. b. Latero-ventral aspect. Male. 

 XlOO 



10 Cbironomus f u 1 v i v e n t r 1 s . Male. xlOO 



11 Cbironomus modestus. Female. xlOO 



12 Cbironomus flavus. Ventral aspect. Male. xlOO 



13 Cbironomus decerns. Dorsal aspect. Male. xlOO 



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 Ortbocladius ker villi (after Kieffer) 



2 Cricotopus exilis. 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. xloO 



4 Tan y tarsus exiguus. Ventral aspect. Male. x350 



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



5 T any tarsus dives. Male. Dorsal aspect. xlOO 



6 Metrioenemus par. INIale. Lateral aspect. xlOO 



7 Ortbocladius absurdus. Lateral aspect. Female. xlOO 



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



