. Bulletin. Natural history; Natural history. Illinois Natural History Survey Bulletin 94 Moderate size ( mm); brownish; frons narrow, widened above; palpi white; third antennal segment very slender; eyes bare; wing hyaline; abdo- men with pale median line of contigu- ous triangles and pale sublateral spots, which rarely reach hind margins of tergites (Fig. 168). Male eye facets dis- tinctly differentiated; pale sublateral spots often reach hind margins of tergites; eyes bare. This species is crepuscular and prob- ably nocturnal as well; many individu- als of both sexes have been collected
. Bulletin. Natural history; Natural history. Illinois Natural History Survey Bulletin 94 Moderate size ( mm); brownish; frons narrow, widened above; palpi white; third antennal segment very slender; eyes bare; wing hyaline; abdo- men with pale median line of contigu- ous triangles and pale sublateral spots, which rarely reach hind margins of tergites (Fig. 168). Male eye facets dis- tinctly differentiated; pale sublateral spots often reach hind margins of tergites; eyes bare. This species is crepuscular and prob- ably nocturnal as well; many individu- als of both sexes have been collected at light. Nothing is known of its biology. Larvae (Fig. 198) have been collect- ed 10-15 cm deep in well drained soil on a hillside in a hardwood forest in Arkansas (Goodwin 1976b). In Illinois adults appear in late June and have been collected until late September. T. sackeni is a northeastern species, extending from Georgia to New Hampshire and west to Kansas and Arkansas (Fig. 245). This species has been collected in southern Illinois and in a band across north-central Illinois (Fig. 245). Vol. 33, Art. 1. Tabanus sagax Osten Sacken Tabanus sagax Osten Sacken (1876:452). Type-locality: Illinois (lectotype). Atylotus baalTownsend (1895:58). Type- locality: Virginia, Dixie Landing. Tabanus dawsmi Philip (1931:105). Type- locality: Minnesota, Itasca Park. Moderate size (14 mm); orange brown; frons parallel sided, quite broad; third antennal segment variable but usually slender, dark orange with an- nuli black; second palpal segment swollen; eyes bare; wing hyaline; abdo- men with median line of contiguous triangles, rather indistinct sublateral spots. Male eye facets distincdv dif- ferentiated; eyes bare. This species is rather uncommon throughout its range, and it may be a crepuscular species like T. sackeni. The larvae and biology of this spe- cies are unknown. In Illinois adults appear at the end of July and have been collected until mid-September. T. sagax is an eastern sp
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