. Bulletin. Natural history; Natural history. April 1983 Pechuman, Webb, & Teskev: Dipiera ok Illinois—Tabanidae 99 man 1972; Teskey 1969; Tidwell 1973; Wilson 1969). There is some evidence that the larvae feed on white grubs (Davis 1919). The normal life cycle is 1 year, but it sometimes requires 2. In Illinois adults normally appear in June but do not become abundant until July and August; they have been collected until late September. T. sulcifrons is a southern and east- ern species, extending from northern Florida to Rhode Island and west to western Kansas and Texas (Fig. 253). In Ill
. Bulletin. Natural history; Natural history. April 1983 Pechuman, Webb, & Teskev: Dipiera ok Illinois—Tabanidae 99 man 1972; Teskey 1969; Tidwell 1973; Wilson 1969). There is some evidence that the larvae feed on white grubs (Davis 1919). The normal life cycle is 1 year, but it sometimes requires 2. In Illinois adults normally appear in June but do not become abundant until July and August; they have been collected until late September. T. sulcifrons is a southern and east- ern species, extending from northern Florida to Rhode Island and west to western Kansas and Texas (Fig. 253). In Illinois this species is collected throughout the state (Fig. 253). Included with sulcifrons in this study is a form which was collected in some of the southern Illinois counties. It is generally darker, with darker femora and narrower palpi, and the pollen of the mesothorax often has a lavender tinge. The males have enlarged upper eye facets as in sulcifrons, but they take up less of the eye area; the line of demarcation from the small facets is straight rather than sinuate. This form may represent a distinct species, but apparent integrades with the form more generally distributed in Illinois pre- vent its separation at this time on pure-. ly morphological characters. It is more common in the southern states and generally flies a little later than "typical" sulcifrons, but both may be collected at the same time. Tabanus superjumentarius Whitney Tabanus superjumentarius Whitney (1879:37). Type-locality: New Hamp- shire, Milford. Moderate size (16 mm); eyes bare; thorax with grayish white pile; wing yellowish, becoming deeper colored anteriorly, especially along veins and in costal cell; fore tibiae uniformly dark; abdomen black with small median white triangles on second to fifth tergites, triangle on second very small or some- times absent (Fig. 178). Male eye fac- ets distinctly differentiated; thorax with brownish pile; eyes bare. The larvae (Fig. 204) have been ta
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
