. Bulletin. Natural history; Natural history. 258 ILLINOIS NATURAL HISTORY SURVEY BULLETIN XX:III Rock Island, Pekin, Fithian, Urbana, Champaign, White Heath, Clinton, Hume, Kansas, Oakland, Sullivan, Rockport, Carlinville, Albion. G. major Saussure.—Described in 1874 from "Illinois," no ma- terial from this state has been seen by us. The type was however prob- ably correctly labeled, as major is known from Carthage, Mo., and a southeastern published limit is Louisville, Miss. Westward the species is not known beyond the eastern limits of the great plains. TRIBACTYLINAE Tridactylus O
. Bulletin. Natural history; Natural history. 258 ILLINOIS NATURAL HISTORY SURVEY BULLETIN XX:III Rock Island, Pekin, Fithian, Urbana, Champaign, White Heath, Clinton, Hume, Kansas, Oakland, Sullivan, Rockport, Carlinville, Albion. G. major Saussure.—Described in 1874 from "Illinois," no ma- terial from this state has been seen by us. The type was however prob- ably correctly labeled, as major is known from Carthage, Mo., and a southeastern published limit is Louisville, Miss. Westward the species is not known beyond the eastern limits of the great plains. TRIBACTYLINAE Tridactylus Olivier KEY TO SPECIES Caudal metatarsi present. Larger. Pronotum with a weak transverse sulcus. Shin- ing brown, little or not maculate apicalis Caudal metatarsi absent. Smaller. Pronotum not sulcate. Blackish brown, usually strikingly maculate with buffy minutus. Fig. 165.—Adult male of the pygmy mole cricket Tridactylus minutus Scudder. X 15. T. apicalis Say.—Thomas' illinoisensis is an established synonym, described from Illinois in 1863. The species has been reported from southern Illinois and as the established synonym terminalis from Urbana and Quincy by McNeill in 1891. Decided individual size variation occurs in both sexes, females being best distinguished by the slight concavity mesad of the distal margin of the penultimate sternite. This insect occurs about lakes and watercourses throughout the state. On the Mississippi it is known as far north as southeastern Minnesota. Seventeen males, 43 females, taken May 8 to September 11, and eight immatures are from Beach, Chicago, Savanna, Peoria, Havana, Urbana, Matanzas Lake, Quincy (on sand bar), Kampsville, Herod, Elizabethtown, Olive Branch. T. minutus Scudder.—This species was reported from Champaign by McNeill in 1891. About half the adults of this series are macropterous, the others Please note that these images are extracted from scanned page images that may have been digitally enhanced for rea
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