. Bulletin. Natural history; Natural history. 72 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 meson and reach beyond sternite; ninth seg- ment long and somewhat vasiform, without conspicuous internal processes. Taken in all parts of the state, this spe- cies shows a marked preference for large rivers such as the Illinois, Kaskaskia and Mississippi; however, we have taken it in numbers along many small streams. Usual- ly it is taken in only small numbers, but occasionally large swarms are encountered. The adult emergence occurs from May until October. The species is widely distribut
. Bulletin. Natural history; Natural history. 72 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 meson and reach beyond sternite; ninth seg- ment long and somewhat vasiform, without conspicuous internal processes. Taken in all parts of the state, this spe- cies shows a marked preference for large rivers such as the Illinois, Kaskaskia and Mississippi; however, we have taken it in numbers along many small streams. Usual- ly it is taken in only small numbers, but occasionally large swarms are encountered. The adult emergence occurs from May until October. The species is widely distributed through the central states; records include Alabama, Arkansas, Illinois, Kentucky, Michigan, Minnesota, Missouri, Ohio, Oklahoma, Tennessee and Wisconsin. It is also known from near the mouth of the Amazon River in South America. Illinois Records.—Many males and fe- males, taken May 29 to October 10, are from Algonquin, Antioch, Bartonville (Kick- apoo Creek), Danville, Deer Grove (Green River), Dixon, East Dubuque, Elgin (Bo- tanical Gardens), Grafton, Hamilton, Har- din, Havana (Spoon River), Herod, Kan- kakee (Kankakee River), Milan (Rock River), Olive Branch (Horse Shoe Lake), Ottawa, Palos Park (Mud Lake), Pontiac, Ripley (La Moine River), Rockford, Rock Island, Springfield (Sangamon River), Spring Grove, Thebes, Venedy Station (Kaskaskia River). Cernotina Ross Cernotina Ross (1938fl, p. 136). Genotype, by original designation: Cernotina calcea Ross. No larva of this genus has been discov- ered. The adults of both sexes are 5-6 mm. long, with the head, body and appendages straw color, the wings and parts of the legs darkened with brown hair. The female geni- talia are similar in all species known, the genital segments forming a conical structure with only simple parts, fig. Fig. 267.—Cernotina calcea, female genitalia. Of the six North American species, only one has been taken in Illinois, but three others are known from Michigan and Ohio and may eventually be
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