. Bulletin. Natural history; Natural history. April 1983 Pechliman, Webb, & Teskev; Dip i era ok Illinois—Tabanidae 21 Large size (21 mm); brownish; first antennal segment only slightly longer than wide (Fig. 25); flagellum with two or three annuli; abdomen with large white patch indented above on fourth tergite, two white spots on fifth tergite; wing membrane tinted with brown, deeper toward front margin, base, and along veins; costal cell yellowish brown; hind tibiae with very small apical spurs. Male easily associated with female. The larvae have been collected from organic material und
. Bulletin. Natural history; Natural history. April 1983 Pechliman, Webb, & Teskev; Dip i era ok Illinois—Tabanidae 21 Large size (21 mm); brownish; first antennal segment only slightly longer than wide (Fig. 25); flagellum with two or three annuli; abdomen with large white patch indented above on fourth tergite, two white spots on fifth tergite; wing membrane tinted with brown, deeper toward front margin, base, and along veins; costal cell yellowish brown; hind tibiae with very small apical spurs. Male easily associated with female. The larvae have been collected from organic material under a meter of water, from sandy clay mud in the marginal region of a small lake, from moss along the edge of a pool, and from silt along a stream (Pechuman 1972; Teskey 1969; Tidwell 1973). M. wliitneyi is a southeastern species, extending from central Florida to Maine and west to Indiana and Alabama, with a disjunct population in southern Ontario (Fig. 35). As yet this species has not been collected in Illinois al- though the Indiana record was collect- ed in a county adjacent to Rg. 35.—Distribution of Merycomyia whitneyi in North America. Chrysops Meigen This genus includes the common deer flies with dark wing markings. The eyes are bright green and gold with dark markings. The bright colors and dark markings disappear from the eyes shortly after death. The deer flies are annoying pests of man but probably are of less importance as pests of livestock than the larger Tahayim and Hybomitra species. They are most abundant in wooded areas but are also found in many oth- er surroundings. Adult deer flies first appear in early April in Illinois and have been collected until mid-Septem- ber. The main flight season of each species is short, rarely over 2 weeks; nevertheless, specimens may be found throughout the season. The males of all species of Cluysops (except C. sequax tau) found or likely to be found in Illinois are known. In several species, however, the male i
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