. Bulletin. Natural history; Natural history. 276 Illinois Natural History Survey Bulletin Vol. 31, Art. 7 Head and thorax yellow to dark brown. Wings (Fig. 27) amber, pterostigma slightly darker than surrounding area, crossveins not margined except in spe- cimens found in western areas of Mis- souri and Arkansas. Subcostal crossvein basal to first fork of radial sector. Two pterostigmal crossveins. Apical cross- vein absent. In almost all specimens examined the wings were uniformly colored, and the crossveins were not margined although specimens collected in southwestern Missouri and Arkansas
. Bulletin. Natural history; Natural history. 276 Illinois Natural History Survey Bulletin Vol. 31, Art. 7 Head and thorax yellow to dark brown. Wings (Fig. 27) amber, pterostigma slightly darker than surrounding area, crossveins not margined except in spe- cimens found in western areas of Mis- souri and Arkansas. Subcostal crossvein basal to first fork of radial sector. Two pterostigmal crossveins. Apical cross- vein absent. In almost all specimens examined the wings were uniformly colored, and the crossveins were not margined although specimens collected in southwestern Missouri and Arkansas show some mar- gination of the crossveins. Legs dark yellowish brown. Femora slightly swollen. Abdomen pale yellow to dark brown. In males ninth tergum and basistyles brown. In males lobes of ninth tergum in lateral view (Fig. 39) narrow, sub- rectangular, extending well beyond api- ces of basistyles; in dorsal view (Fig. 40) lobes converge apically, with two distinct medial prominences on each lobe, each prominence with several black spines; a small patch of spines present near ventral margin of lobes. Basistyles broad. Dististyles short, rounded apically. Aedeagus thickened basally, tapered apically. Cerci narrow, elongate, extending beyond apices of basistyles. This species closely resembles B. texanus. The females are separated on the basis of wing color, which is not always reliable. In places where these two species overlap, the wing crossveins in B. stigmaterus are often margined. The males of these two species can be separated by the arrangement of spines on the medial margin of the ninth tergum. This species has been collected in habitats similar to those of B. strigosus and B. apicalis although it is sometimes found in fairly dry woods. B. stigmaterus extends from Georgia to New York and west to Minnesota and Texas (Fig. 48).. Fig. 48.—Distribution of Bittacus stigma- terus in Illinois and North America. Illinois Records.—(Fig. 48). Col- lected from late June to
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
