122 ILLINOIS NATURAL 
taintly with yellow or brown, apical abdom- 
inal segments chestnut brown, genitalia and 
caudal filaments white; apical forceps seg- 
ments, fig. 269, each three times as long as 
wide. 
Known from Maryland, New York, On- 
tario, and Quebec. 
(aa Se 
ELACHISTUS 
PROPINQUUS 
HARTI 
273 ae 
CLEPTIS FRONDALIS 
HERODES ‘ 
Se ee 
PYGMAEUS 
Ad 277 
ANACHRIS PLUTO 
278 
LEVITANS . 
279 VAGANS Ty 
RUSTICANS 
284 
PHYLLIS BRUNNEICOLOR INTERCALARIS 
Fig. 270.—Bactis propinquus, hind wing of 
adult male. 
Fig. 271.—Baetis elachistus, hind wing of 
adult male. 
Fig. 272.—Baetis harti, hind wing of adult 
male. 
Fig. 273.—Baetis cleptis, hind wing of adult 
male. 
Fig. 274.—Baetis frondalis, 
adult male. 
Fig. 275.—Baetis herodes, hind wing of adult 
male. 
Fig. 276.—Baetis pygmaeus, hind wing of 
adult male. 
hind wing of 
Fig. 284.—Baetis intercalaris, hind wing of adult male. 
History SurvEY BULLETIN 
Vol. 26, Art. 1 
32. BAETIS Leach 
Baetis Leach (1815: 137). 
Brachyphlebia Westwood (1840:25). 
Acentrella Bengtsson (1912:110). 
In Baetis, the stalk of each turbinate 
eye of the male is relatively high, so that 
Fig. 277.—Baetis anachris, hind wing of — 
adult male. 
Fig. 278.—Baetis pluto, hind wing of adult 
male. (After McDunnough.) 
Fig. 279.—Baetis levitans, hind wing of adult 
male. 
Fig. 280.—Baetis vagans, hind wing of adult 
male. 
Fig. 281.—Baetis rusticans, hind wing of — 
adult male. (After McDunnough. ) 
Fig. 282.—Bacetis phyllis, hind wing of adult 
male. 
Fig. 283.—Baetis brunneicolor, hind wing of 
adult male. 
