. Bulletin. Natural history; Natural history. 152 Illinois Natural History Survey Bulletin Vol. 22, Art. 1 ern species that finds its eastern limits of distribution in Illinois, Iowa, Michigan and Minnesota. Illinois Record. — Northern Illinois: 19. Lygus atritibialis new species This species is allied to hesperus Knight and related western species, but is easily- to be distinguished by its uniformly black an- tennae and posterior tibiae, fig. 163. Male.—Length , width Head width , vertex ; yellow, collum black. Rostrum, length , extending slightly beyond hind coxae, yell
. Bulletin. Natural history; Natural history. 152 Illinois Natural History Survey Bulletin Vol. 22, Art. 1 ern species that finds its eastern limits of distribution in Illinois, Iowa, Michigan and Minnesota. Illinois Record. — Northern Illinois: 19. Lygus atritibialis new species This species is allied to hesperus Knight and related western species, but is easily- to be distinguished by its uniformly black an- tennae and posterior tibiae, fig. 163. Male.—Length , width Head width , vertex ; yellow, collum black. Rostrum, length , extending slightly beyond hind coxae, yellow, apex very dark brown. Antennae uniformly black; first segment, length ; second, ; third, ; fourth, Pronotum, length , width at base ; yellow; a lateral, submarginal line joining outer half of callus, two rays behind each callus (in dark spec- imens these rays joining to form a submar- ginal line), and ray behind top of coxal cleft, black. Scutellum yellow; a geminate mark on middle of base, lateral edges and meso- scutum, black. Hemelytra pale, translucent yellowish; middle of clavus and outer apical angle of corium fuscous. Cuneus pale, trans-. Fig. 163.—Lygus atritibialis, 9. lucent; outer margin yellowish, but not darker on apex. Membrane pale fuscous, veins pale. Dorsum clothed with fine, short, pale pubescence. Ventral surface uniformly yellow. Legs mostly yellowish, but hind femora with two subapical black annuli; hind tibiae black; middle and front pairs pale, fuscous at apices and each one with a black ring at base, spines black; tarsi fus- cous, apices and claws very dark brown. Genital claspers as in fig. 161. Female.—Length , width Head width , vertex Antennae, first segment, length ; second, Slightly more robust than male, but very similar in coloration; black marks on pronotum usually more reduced. Food Plant.—Apparently breeds on wormwood (Artemisia canadensis). Holotype, male.—Oregon, 111.: J
Size: 1236px × 2021px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
