MAY FLIES AND MIDGES OF NEW YORK 189 



aa Labium with an even number of teeth 



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



82. Ghir. sp. 

 &6 The teeth uniformly dark 



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



fig.24 44. fulviventris n. sp. 



cc Middle pair as long or longer than the laterals 



d 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.G 32. n i g r i c a n s n. sp. 



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

 bloodworms, pl.23, fig.G, No. 83 ; 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 

 6 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.12. .60. d e c o r u s n. sp. 

 dd Spurs slender and seta-like 



e See pl.22, figs. 8 and 12 43. modestus 



ee See pl.21, figs. 2 and 3 25. t e n e 1 1 u s 



&& Spur, if present, with teeth 



c Spur wanting, pl.22, fig.14 43b. Var. of modestus 



cc Spur present 



d Large species over 15 mm. in length, pl.23, fig.14 



59. ?plumosus 

 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.18 (perhaps Tanytarsus sp.) 

 aa Lateral fin with a comb of three or more teeth 

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



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

 &6 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 spots, pl.21, figs. 16 and 17 



16. f 1 a v i c i n g u 1 a 

 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. lob if er us 



