. Bulletin. Natural history; Natural history. 46 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 length to basal segment; apico- mesal process of seventh sternite very long, fig. 167 moestus, p. 47. Fig. 167.—Dolophilus moestus, male genitalia. 168 Fig. 168.—Dolophilus moestus 9, maxillary palpus. Fig. 169.—Dolophilus shawnee 9, maxillary palpus. 3. Maxillary palpi with second segment cylindrical, of the same diameter as first segment, fig. 168. . .moestus, p. 47 Maxillary palpi with second segment swollen on the mesal side, so that at this point it is considerably wider than the firs
. Bulletin. Natural history; Natural history. 46 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 length to basal segment; apico- mesal process of seventh sternite very long, fig. 167 moestus, p. 47. Fig. 167.—Dolophilus moestus, male genitalia. 168 Fig. 168.—Dolophilus moestus 9, maxillary palpus. Fig. 169.—Dolophilus shawnee 9, maxillary palpus. 3. Maxillary palpi with second segment cylindrical, of the same diameter as first segment, fig. 168. . .moestus, p. 47 Maxillary palpi with second segment swollen on the mesal side, so that at this point it is considerably wider than the first segment, fig. 169. . , shawnee, p. 46 Dolophilus shawnee Ross Dolophilus shawnee Ross (1938^, p. 133); cf, 9. Larva.—Length 11-12 mm. Body slen- der. Head, pronotum, legs and anal hooks golden yellow. Head with a few long, scat- tered setae and with a pair of transverse brown bars near the posterior angle of the frons; mandibles relatively small with fine teeth near apex, fig. 173. Pronotum with a row of scattered setae along the anterior margin and another similar row across the segment at the point of the attachment of the legs. Body whitish when preserved, each segment with two pairs of slender setae. Anal hooks without inner teeth. Legs of similar shape and proportions, only the first pair with coxal spur. Adults.—Fig. 170. Length 7-9 mm. Color of head, body and legs varying shades of brown; antennae annulate with tawny and dark brown; wings uniformly gray. Head and thorax bearing tufts of thick tawny hair, and wings with fine, short, black setae which give them a purplish shade. Male genitalia, fig. 166, with claspers long, the apical segment twice the length of the basal segment. This species is very abundant locally in clear, rapid, temporary streams in the Ozark Hills of southern Illinois. The adults are secretive and seldom captured even in localities where the larvae and pupae are abundant beneath almost every stone. The species is single brooded, the adul
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