. Bulletin. Natural history; Natural history. 36 Illinois Natural History Survey Bulletin Vol. 33, An. 1 spot broad (Fig. 38), usually nearly filling second submarginal cell; hya- line triangle does not reach second longitudinal vein; crossband broad, cov- ering discal cell, reaching hind margin of wing; first basal cell infuscate; sec- ond basal cell hyaline; fifth posterior cell mostly hyaline. Male with yellow areas reducecl; second basal cell large- ly infuscated. C. aberrans is often confused with C. striatus. The two species are much alike and often fly together but can be dis- tinguishe
. Bulletin. Natural history; Natural history. 36 Illinois Natural History Survey Bulletin Vol. 33, An. 1 spot broad (Fig. 38), usually nearly filling second submarginal cell; hya- line triangle does not reach second longitudinal vein; crossband broad, cov- ering discal cell, reaching hind margin of wing; first basal cell infuscate; sec- ond basal cell hyaline; fifth posterior cell mostly hyaline. Male with yellow areas reducecl; second basal cell large- ly infuscated. C. aberrans is often confused with C. striatus. The two species are much alike and often fly together but can be dis- tinguished by the characters given in the key. Although the frontal callus is typically yellow, some populations run rather heavily to individuals with the callus brown or black. The larvae (Fig. 107) are most com- monly collected from mud or sand at the edges of ponds and lakes but have also been taken from a variety of oth- er semiaquatic habitats (Pechuman 1972; Teskey 1969). This species is most commonly col- lected in and near cattail swamps. In Illinois adults appear in late June and have been collected until late Fig. 113.—Distribution of Chrysops aberrans in Illinois and North America. Its peak abundance is from mid-July to mid-August. C. aberraris is an east-central species, extending from New Jersey to Nova Scotia and west to Minnesota and Iowa, with a possible disjunct population in Nebraska (Fig. 113). In Illinois this species is found in the northern two- thirds of the state (Fig. 113). Chrysops aestuans Wulp Chrysops aestuans Wulp (1867:135). Type- locality: Wisconsin. Chrysops moerens Walker (1848:201). Type-locality: Nova Scotia. Moderate size ( mm): black; frontoclypeus shining yellow: frontal callus black; abdomen with gray or yellowish gray markings not in form of stripes, black triangles on second ab- dominal segment, one on each side of median dark marking, triangles may or may not be connected with latter by dark band along posterior margin of segment
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