. Bulletin. Natural history; Natural history. PRISON: STONEFLIES. OR PLECOPTERA, OF ILLINOIS 295 Speciels Nov. AllocQPniQ recta AUocapniQ mystloQ Allocapnia forbeai Dec. Jan. 1-15 ,ifcji AllocQpnia f. var. cornuta Wlocupnia vivipara Allocapnia pyqmaca TaeniopterLjX nivalis Mlocapnia iHinoens'is Allocapnia granulata Strophopterux fasclata Leuctra cloassenl TaenioptercjX porvula Capnia Cvernalis ">) boperla confuia Perilnella drymo boperla biilneata Nemoura venosa Pteronarcus nobiUs Hydroperia crosbyi Hydroperla varian5 isoperla mohri boperla decepta Hydroperla ha
. Bulletin. Natural history; Natural history. PRISON: STONEFLIES. OR PLECOPTERA, OF ILLINOIS 295 Speciels Nov. AllocQPniQ recta AUocapniQ mystloQ Allocapnia forbeai Dec. Jan. 1-15 ,ifcji AllocQpnia f. var. cornuta Wlocupnia vivipara Allocapnia pyqmaca TaeniopterLjX nivalis Mlocapnia iHinoens'is Allocapnia granulata Strophopterux fasclata Leuctra cloassenl TaenioptercjX porvula Capnia Cvernalis ">) boperla confuia Perilnella drymo boperla biilneata Nemoura venosa Pteronarcus nobiUs Hydroperia crosbyi Hydroperla varian5 isoperla mohri boperla decepta Hydroperla harti Isoperla minuta Isoperla richardsoni Perlesta placida Isoperla conspicua Acroneuria abnormls Feb. ^-l5,lb-2g MAR. Apr, May -15 .lb 01 Neophasganophora capitota AcroneuriQ ruralis Atoperla ephyre ' Acroneuria arida Acroneuria internata Neoperla clLjmene June JULV Aug. I-I5,lb-3I Fig. 15.—Seasonal Adults of the 34 species of Illinois stoneflies charted here are timed to occur almost throughout the year. Two species listed in this work are omitted from the graph because of insufficient data. Species Nov. I-I5,ifa00 ^4AR 1- l^.lt-31 Apr May I- I' l-l^,lbXI 1-15 .lfc'31. Auo. Allocapnia myst'ica Allocapnia recta AUocopniG vivipara TaenioptertjX nivalis Allocapnia granulQtQ StrophopferLjx fasciot'a Perlinella drqmo Isoperla bilineota Neophosqanophora capitata Atoperla eptiqre Perle?>ta placida ^crone'urla orida Acroneuria mternota Neoperla clqmene Acroneuria abnormis Fig. 16.—Seasonal succession. The widest part of the spindle indicates the time of maximum abundance ot adults for each of these 15 stonefly species which occur in the vicinit>- of Oakwood, Illinois. unique among the major insect orders of the state, and something merit- ing more emphasis in general texts. I have previously commented (1929) on this as follows: "Such phenomena cannot fail to wonder and forceful
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
