. Bulletin. Natural history; Natural history. 80 Illinois Natural History Survey Bulletin Vol. 33, Art. 1 times with a whitish or bluish bloom. Male eye facets distinctly differentiated; eyes bare. The eggs are laid on grass or leaves over marshy areas or streams and also on concrete bridge abutments. The larvae (Fig. 203), which can be found throughout the year, live in moist earth or in water and seem to tolerate a wide range of moisture conditions (Jones & Bradley 1923; Pechuman 1972; Teskey 1969; Tidwell 1973). The life cycle is usually completed in 1 year, but some individuals require
. Bulletin. Natural history; Natural history. 80 Illinois Natural History Survey Bulletin Vol. 33, Art. 1 times with a whitish or bluish bloom. Male eye facets distinctly differentiated; eyes bare. The eggs are laid on grass or leaves over marshy areas or streams and also on concrete bridge abutments. The larvae (Fig. 203), which can be found throughout the year, live in moist earth or in water and seem to tolerate a wide range of moisture conditions (Jones & Bradley 1923; Pechuman 1972; Teskey 1969; Tidwell 1973). The life cycle is usually completed in 1 year, but some individuals require 2 years and possibly more. In Illinois adults appear in late May and have been collected until early Fig. 221.—Distribution of Tabanus atratus atratus in Illinois and North America. T. atratus atrattts is a widely distribut- ed species, extending from the south- ern tip of Florida to Maine and west to North Dakota and into the north- eastern corner of Mexico (Fig. 221). In Illinois this species has been collect- ed throughout the state (Fig. 221). Tabanus calens Linnaeus Tabanus calens Linnaeus (1758:601). Type-locality: America. Tabanus giganteus De Geer (1776:226). Type-locality: Pennsylvania. Tabanus lineatus Fabricius (1781:455). Type-locality: America. Tabanus pallidus Palisot de Beauvois (1809:100). Type-locality: United States. Tabanus bicolor Macquart (1847:37). Type-locality: South Carolina. Name preoccupied (Wiedemann 1821). Tabanus coesiofasciatus Macquart (1855: 52). Type-locality: Maryland. Balti- more. Large (24 mm); subcallus not de- nuded; palpi pale to reddisn brown; eyes bare; thorax brown with indis- tinct reddish lines; wing pale yellowish with costal cell darker; abdomen blackish, sometimes with faint, pale, median triangles (Fig. 160). Male eye facets show little differentiation and line of demarcation not distinct; pale median triangles of abdomen, when. Please note that these images are extracted from scanned page images that may have been
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