Morphological characteristics of predatory stink bug Picromerus lewisi Scott at different developmental stages
The morphological characteristics of different stages of predatory stink bug Picromerus lewisi Scott were examined using stereoscopy.The results showed that P.lewisi eggs were circular or ovoid,and the egg mass was rectangular with metallic and golden eggshell on its surface.The false egg cover was circular with a triangular egg breaker,forming a ring outside the false egg cover.The first and second instar nymphs were dark red,without wing buds,while the third instar nymphs were black.The fourth instar nymphs were light brown.By the fifth instar,the body color turned light yellow with clearly visible black-brown wing buds.Adult P.lewisi were black with a light yellow or yellowish white color on the end half of the forewing leather and the base of the membrane.The top of the thick spines on the upper part of the scutellum was bifurcated,and the abdominal valve was light yellow-brown.All legs were black with many fine hairs.The abdomen of male P.lewisi adults was nearly triangular,while that of females was ovoid.There were four black spots in the center of the third to sixth segments of the abdomen in female adults,initially appearing as small black spots and gradually increasing in size until they resembled a pagoda-shaped large black spot.In male adults,there were four black spots in the center of the third to sixth segments of the abdomen,initially appearing as small triangle and gradually increasing in size until resembling a bell-shaped large black spot.
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