. Bulletin. Natural history; Natural history. 274 Illinois Natural History Survey Bulletin Vol. 31, Art. 7 This species extends from Florida to Canada and west to Minnesota and Kansas (Fig. 45).. Fig. 45.—Distribution of Biltacus pilicernis in Illinois and North America. Illinois Records.—(Fig. 45). Col- lected in Illinois from June to mid- August. Bittacus occidentis Walker Bittacus occidentis Walker (1853:469). S, 9. Type-locality: Erie, United States. Type-specimen missing. Bittacus arizonicus Banks (1911:350). i. Type-locality: Palmerlee, Ari- zona. Synonymized by Carpenter (1931a). Head a
. Bulletin. Natural history; Natural history. 274 Illinois Natural History Survey Bulletin Vol. 31, Art. 7 This species extends from Florida to Canada and west to Minnesota and Kansas (Fig. 45).. Fig. 45.—Distribution of Biltacus pilicernis in Illinois and North America. Illinois Records.—(Fig. 45). Col- lected in Illinois from June to mid- August. Bittacus occidentis Walker Bittacus occidentis Walker (1853:469). S, 9. Type-locality: Erie, United States. Type-specimen missing. Bittacus arizonicus Banks (1911:350). i. Type-locality: Palmerlee, Ari- zona. Synonymized by Carpenter (1931a). Head and thorax dark yellowish brown to dark brown. Wings (Fig. 25) pale yellow, ptero- stigma slightly darker than surrounding membranes. Subcostal crossvein distal to first fork of radial sector. Two ptero- stigmal crossveins. Apical crossveins absent. Several specimens possess an apical crossvein on at least one of the fore wings. In one specimen the sub- costal crossvein occurs at the first fork of the radial sector although this cross- vein is normally found well beyond the fork. Legs yellowish brown to brown, apices of tibiae dark brov*Ti. Hind fem- ora swollen. Abdomen yellowish brown to browm. In males ninth tergum and basistyles yellowish broviTi to dark brown. Ninth tergum in lateral view (Fig. 35) nar- row, rounded apically, extending to or slightly beyond apices of basistyles; in dorsal view (Fig. 36) ninth tergum di- verges apically, with 30 or more black spines along dorsal margins of lobes. Basistyles broad, curved dorsally. Dis- tistyles elongate, narrow. Aedeagus very thick at base, tapered apically to slender thread which curves anteriorly. Cerci short, slender, not extending beyond middle of basistyles. The wing's subcostal crossvein, distal to the first fork of the radial sector, and the swollen hind femur readily distin- guish this species from other Nearctic bittacids. No specific habitat has been recorded for B. occidentis. All Illinois specimens were colle
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