. Bulletin. Natural history; Natural history. 252 ILLINOIS NATURAL HISTORY SURVEY BULLETIN XX:III OECANTHUSâKEY TO SPECIESâCONT D First antennal segment with a J shaped black mark, second with a black dot, fig. 162, 5. Size averaging appreciably smaller. Bush, vine and tree in- habitant angustipennis, p. 253 5. Marks on first antennal segment normally not as heavy, separated by an interval at least as wide as the widest of them, varying individually through mere' lines to obsolete, in rare cases of maximum recession. Form less robust. General coloration pale, never with striking markings. Pref
. Bulletin. Natural history; Natural history. 252 ILLINOIS NATURAL HISTORY SURVEY BULLETIN XX:III OECANTHUSâKEY TO SPECIESâCONT D First antennal segment with a J shaped black mark, second with a black dot, fig. 162, 5. Size averaging appreciably smaller. Bush, vine and tree in- habitant angustipennis, p. 253 5. Marks on first antennal segment normally not as heavy, separated by an interval at least as wide as the widest of them, varying individually through mere' lines to obsolete, in rare cases of maximum recession. Form less robust. General coloration pale, never with striking markings. Prefers pithy stemmed herbs nigricomis quadripunctatus, p. 253 Lâ/ ( y^^\ Marks on first antennal segment heavier, /â Jl ( â » ^ I often confluent, varying individually to ^X-_. 1 p 7 l^' \ separated by an interval in extreme cases /HH^ r^ti \ I as wide as the widest mark, fig. 162, 1, lU I B 9m\ -â 6. Form less robust. General coloration pale, \W I â 1^^ never with striking markings. Prefers ^ 1- "^ 1 BHH pithy stemmed herbs nigricomis argentinus, p. 253 Form averaging slightly more robust. General coloration pale, in intensive material with proximal antennal joint suffused, other portions of antennae, head, ventral surface of abdomen, legs (except caudal femora) and three longi- tudinal bands on pronotum black, the latter sometimes fused. Prefers large coarse herbaceous plants nigricomis nigricomis, p O. exclamationis Davis.âThis insect occurs over southern and middle Ilhnois as far north as St. Joseph, Decatur and Grafton, the westernmost points for it being central MissouriâWillard (ma-. Fig. 162.âBasal segments of antennae of Oecanthus and Neox- abea spp. 1, Oecanthus nigricomis. 2, Oecanthus nigricomis. 3, Neox- abea bipunctata. 4, Oecanthus niveus. 5, Oecanthus angustipen- , Oecanthus latipennis. (After Hart, Entomological News, vol. III. p. 33.) 25312 terial before us) and Hollister. Though it is the scarcest species of the genus in the United S
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
