. Bulletin. Natural history; Natural history. April 1983 Pechuman, Webb, & Teskev: Dihtera of Illinois—Tabanidae 51 lected infrequently in southern and northern IlHnois (Fig. 137). Chrysops niger Macquart Chrysops niger Macquart (1838:165). Type-locality: North America. Moderate size ( mm); black; frontoclyfjeus without median poUinose stripe; bare area of vertex interrupted by pollen; sublateral thoracic stripes dull or obsolete; apical spot and hya- line triangle absent (Fig. 62); cross- band broad, covering discal cell, narrowed posteriorly, reaching hind margin of wing; first basal
. Bulletin. Natural history; Natural history. April 1983 Pechuman, Webb, & Teskev: Dihtera of Illinois—Tabanidae 51 lected infrequently in southern and northern IlHnois (Fig. 137). Chrysops niger Macquart Chrysops niger Macquart (1838:165). Type-locality: North America. Moderate size ( mm); black; frontoclyfjeus without median poUinose stripe; bare area of vertex interrupted by pollen; sublateral thoracic stripes dull or obsolete; apical spot and hya- line triangle absent (Fig. 62); cross- band broad, covering discal cell, narrowed posteriorly, reaching hind margin of wing; first basal cell infuscate; second basal cell hyaline; fifth posteri- or cell hyaline. Male with both basal cells largely infuscated. Face with con- siderable yellow in both sexes. The combination of a hyaline sec- ond basal cell, saturate crossband, and largely yellow face separates this spe- cies and its sibling species, C. calviis, from other dark Chrysops. It is separated from calvus by the characters in the key. Some specimens have a small spot at the bifurcation of the third longitu- dinal vein. The anal area of the wing is sometimes dilutely infuscated. " ^rtsb. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
