. Bulletin. Natural history; Natural history. Fig. 459.—Ithytrichia clavata, female geni- talia. A, ventral aspect; B, bursa copulatrix. Adults.—Length 3 mm. Color dark brown with light mottling over body and wings. Male genitalia, fig. 457: ninth and tenth tergites entirely membranous dorsally, the lateral portion extending to apex of clasper and forming an apical portion with downcurved, truncate lateral aspect and a flared ventral aspect; below this is a thumb- like protuberance from which arises a fin- ger-like process; claspers long and slender, tapering to a narrow apex; aedeagus long, w
. Bulletin. Natural history; Natural history. Fig. 459.—Ithytrichia clavata, female geni- talia. A, ventral aspect; B, bursa copulatrix. Adults.—Length 3 mm. Color dark brown with light mottling over body and wings. Male genitalia, fig. 457: ninth and tenth tergites entirely membranous dorsally, the lateral portion extending to apex of clasper and forming an apical portion with downcurved, truncate lateral aspect and a flared ventral aspect; below this is a thumb- like protuberance from which arises a fin- ger-like process; claspers long and slender, tapering to a narrow apex; aedeagus long, with tubular base, distinct neck with a stout spiral process and long apex flattened and flanged at end. Female genitalia, fig. 459: eighth sternite membranous with six setae at apex, each on a separate basal tubercle; near middle of segment is a curious, head- like structure having internal lobes connect- ed with its base; bursa copulatrix with base open, fig. 4595. Allotype, female.—Cultus Lake, Sardis, British Columbia: July 23, 1936, H. H. Ross. Our only Illinois collection of this species was made at light, along the Galena River, . Council Hill, June 26, 1940, Mohr & Riegel, 7 $ . We have female specimens from Mun- cie which may be this species. Since the female of mazon is not known and may be similar to that of clavata, it seems best to leave these Muncie specimens unidentified. The species has a very wide range, at least transcontinental and perhaps Holarctic, with records from British Columbia, Cali- fornia, Illinois, New York, Oklahoma, Pennsylvania. Tjeder (1930) records the species from Sweden, but there is a doubt as to the correctness of his identification. Ithytrichia mazon new species Male.—Length 3 mm. Color brown with light mottling over body and wings. Gen- eral structure typical for genus. Male genitalia, fig. 458: ninth and tenth tergites not separated, both membranous; lateral area of ninth segment sinuate at base, with an arcuate, sclerotized
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