MAY FLIES AND MIDGES OF NEW YORK 189 



aa Labium AA'itb an even number of teeth 



h The two middle teeth much paler in color than the others, pl.22, fig.22 



82. Ohir. sp. 

 6b The teeth uniformly dark 



c Middle pair (first laterals) shorter than the second laterals, pl.22, 



fig.24 44. f u 1 V i V e n t r i s n. sp. 



cc Middle pair as long or longer than the laterals 



(I Middle pair (first laterals) noticeably longer than the second 

 laterals 

 e Third laterals longer than the second, pl.22, fig.l 



41. f 1 a V u s n. sp. 

 ee Third laterals about same size as the second ; bloodworms, pl.21, 



fig.6 32. nigricans n. sp. 



del The middle pair about the same size as the second laterals; 

 bloodworms, pl.23, fig.O, No. S3 ; and pl.22, fig.21. No. 84 



Pupae 

 aa Lateral fin of the eighth abdominal segment terminates in a spur, which 

 may be simple or toothed 

 & Spur simple, without teeth 

 c Abdominal segments each with a few long setae, pl.22, fig.20 



40. ? f u 1 V u s n. sp. 

 cc Abdominal segments each with a pattern of very minute spines 



d Spurs of eighth segment stout, pl.23. fig.l2. .60. decerns n. sp. 

 dd Spiu's slender and seta-like 



e See pl.22, figs. 8 and 12 43. m o d e s t u s 



ee See pl.21, figs. 2 and 3 25. t e n e 11 u s 



66 Spin-, if present, with teeth 



c Spur wanting, pl.22, fig.l4 43b. Var. of modestus 



cc Spur present 



d Large species over 15 nun. in length, pl.23, fig.l4 



59. ? p 1 u m s u s 

 dd Smaller species 



e Each abdominal segment with a fuscous transverse band near 

 the anterior margin, produced at the ends into lateral longi- 

 tudinal vittae, pl.22, figs. 3 and 4 41. f 1 a v u s n. sp. 



ee Not so marked. Species from Saranac Inn, pl.22, figs. 13 and 17, 

 and fig.lS (perhaps T a n y t a r s u s sp.) 

 aa Lateral fin with a comb of three or more teeth 

 6 Comb with three distinct teeth, pl.22, fig.26 



44. f u 1 v i V e n t r i s n. sp. 



66 Comb not as shown in this figure 



c The median abdominal segments each marked with three trans- 

 verse bands ; the first and third narrow, the middle one wide with 

 a number of hyaline siK)ts, pl.21, figs. IG and 17 



16. flavicingula 



cc Abdominal segments not so marked 



d In nearly mature pupae may be seen the lobes on the dorsum of 

 each abdominal segment of the enclosed imago, pl.23, figs. 4 

 and 5 52. 1 o b i f e r u s 



