. Bulletin. Natural history; Natural history. 50 Illinois Natural History Survey Bulletin Vol. 33, Art. 1. Fig. 136.—Distribution of Chrysops moechus In Illinois and North America. der water, along streams (Pechuman 1972; Teskey 1969). In Illinois adults appear in early June and have been collected until early August. The male is black and is rather frequently collected from leaves of trees overhanging streams (Pechu- man 1972). C. moechus is an eastern species, extending from the Florida panhan- dle to Maine and west to Minnesota and Louisiana (Fig. 136). In Illinois (Fig. 136) this species h
. Bulletin. Natural history; Natural history. 50 Illinois Natural History Survey Bulletin Vol. 33, Art. 1. Fig. 136.—Distribution of Chrysops moechus In Illinois and North America. der water, along streams (Pechuman 1972; Teskey 1969). In Illinois adults appear in early June and have been collected until early August. The male is black and is rather frequently collected from leaves of trees overhanging streams (Pechu- man 1972). C. moechus is an eastern species, extending from the Florida panhan- dle to Maine and west to Minnesota and Louisiana (Fig. 136). In Illinois (Fig. 136) this species has been collect- ed in the northeastern third of the state and in Pope County in southern Illinois. Chrysops montanus Osten Sacken Chrysops montanus Osten Sacken (1875: 382). Type-locality: New York, Cat- skill Mountain House (in Greene County). Moderate size (8 mm); black and yellow; frontoclypeus shining yellow; frontal callus normally dark but some- times brownish: scutellum normally dark; abdomen with geminate black spot, often with sublateral black spot on second tergite, and four rows of spots on third, fourth, and fifth tergites; apical spot variable but usually broad, covering most of second submarginal cell (Fig. 61); hyaline triangle large, reaching second longitudinal \ein; cross- band broad, covering discal cell, reaching hind margin of wing; first basal cell partly infuscate; second bas- al cell nearly hyaline; fifth posterior cell partly infuscate. Male with vellow areas usually much reduced; both bas- al cells partly infuscated. Some specimens lack the small black lateral spots on the second abdominal segment or have them much reduced. The size and shape of the apical spot is also subject to considerable variation. The larvae (Fig. 91) have been col- lected in sand and organic material on the edges of ponds and lakes (Pechu- man 1972; Teskey 1969). In Illinois adults appear in late May and have been collected until late August. C. montanus is an eastern and nor
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