24 Intinois NarurAL History Survey BULLETIN Vol. 26, Art. 1 
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Fig. 27—Hexagenia bilineata, wings. 
Fig. 29.—Ephemerella lutulenta, fore wing. 
Fig. 28.—Neoephemera purpurea, wings. Fig. 30.—Baetisca obesa, fore wing. 
Fig. 31.—Baetis propinquus, fore wing. 
Fig. 32.—Lachlania saskatchewanensis, fore Fig. 35.—Paraleptophiebia praepedita, pos- 
wing. (After Ide.) 
Fig. 33.—Oligoneuria anomala, fore wing. 
(After Eaton.) 
Fig. 34.—Siphloplecton basale, posterior half 
of fore wing. 
terior half of fore wing. 
Fig. 36.—Isonychia rufa, posterior half of 
fore wing. 
Fig. 37.—Siphlonurus quebecensis, posterior 
half of fore wing. 
