. Bulletin. Natural history; Natural history. 44 Illinois Natural History Survey Bulletin Vol. 33. Art. 1 second, third, and sometimes fourth tergites; no apical spot or hyaline tri- angle (Fig. 51); crossband broad, cov- ering discal cell, not reaching hind margin of wing; both basal cells with basal half infuscate; fifth posterior cell with basal half infuscate. Male much darker than female, with pale abdomi- nal markings reduced or obsolete. This species resembles C. cuclux, but the much darker wing picture and the presence of yellowish pile on the tho- racic pleurae and pale middorsal ab-
. Bulletin. Natural history; Natural history. 44 Illinois Natural History Survey Bulletin Vol. 33. Art. 1 second, third, and sometimes fourth tergites; no apical spot or hyaline tri- angle (Fig. 51); crossband broad, cov- ering discal cell, not reaching hind margin of wing; both basal cells with basal half infuscate; fifth posterior cell with basal half infuscate. Male much darker than female, with pale abdomi- nal markings reduced or obsolete. This species resembles C. cuclux, but the much darker wing picture and the presence of yellowish pile on the tho- racic pleurae and pale middorsal ab- dominal markings readily identify this species. The larvae (Fig. 108) are found in mud and organic habitats along the edges of pools, ponds, and lakes (Pechu- man 1972; Teskey 1969). C. excitans is a northern species, extending from Virginia to Labrador and west to California and Alaska (Fig. 126). In Illinois this species has been collected once in late June 1892. Illinois Records.—Lake County, Grass Lake. Chrysops canifrom Walker (1848:197). Type-locality: Florida. Chrysops pallidus Bellardi (1859:73). Type-locality: Mexico. Moderate size ( mm); yellow and brown; frontoclypeus shining yellow; frontal callus yellow; thorax yellow with brown stripes; abdomen with brown markings not in form of stripes; apical spot broad (Fig. 52), covering apical half of second submarginal cell; hva- line triangle broad, not reaching sec- ond longitudinal vein; crossband broad, covering discal cell, narrowed pos- teriorly, reaching hind margin of wing; both basal cells somewhat infuscate at base; fifth posterior cell with basal half infuscate; hind femora yellow, some- times brownish at base. Male differs from female only in sex characters. This species resembles C. celatus. and was previously considered a subspe- cies o( flavidiis. The characters desig- nated in the key will separate these two species. The larvae (Fig. 96) have been tak- en from ponds, streams, and marshes (Jones & Bra
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