Brown Stink Bug
(Order Hemiptera, Family Pentatomidae)
Euschistus Ictericus (photo by Christopher Nguyen)
(Kansas: Sedgwick County. Chisholm Creek Park. 0.36 mi E Oliver, 37° 44' 37.85N, 97° 16' 24.37"W, in grass field. October 22, 2011
Adult Diagnosis: Adults of Euschistus Ictericus grow to a range of 10.5 to 12 mm. They are distinguishable from other brown/tan colored shield bugs by the absence of black spots around the middle section of their ventral abdomen. Euschistus Ictericus have the characteristic "shield" body shape found in the family Pentatomidae. E. Ictericus bodies feature partially hardened elytra, caramel or brown in color, and a distinct triangular scutellum can be seen dorsally. Other features include a triangular pronotum and 5-segmented antennae. They have needle-like mouthparts which are used to pierce and suck on food sources. The reproductive system is internal and thus females and males are difficult to distinguish.
Euschistus Ictericus. Ventral view (Copyright Graham Montgomery 2011, from: http://bugguide.net/node/view/563084)
Euschistus Ictericus. Dorsal view (photographed by Robert Campbell from: http://www.austinbug.com/pentatomidae.html)
Adult Natural History: E Ictericus generally grow up to lengths of 10.5 to 12 mm. Copulation is achieved by the male and female facing opposite directions and posteriors facing each other. During the cold seasons, adults overwinter. They can be pests and invade houses.
The eggs are oviposited in groups and appear barrel-shaped. The eggs are cream white colored and can be found on stems and the undersides of leaves. Upon hatching the nymphs appear similar in shape to the adult form but are slightly rounder. After 5 instars, the nymph emerges as an adult within a period of 4-6 weeks.
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A defensive mechanism of Euschistus Ictericus is the release of foul smelling chemiclas to scare away predators. The chemicals are expelled through glands on the thorax and acts to deter predators and warn others of its kind.
Distribution: The species can be found in Canada, exclusively in Ontario and Quebec and mainly found in the United States from the Eastern coast out to Utah.
Habitat: Both the adults and nymphs live in damp areas such as fields, meadows, marshes, and around other small bodies of water
Diet: Adults and nymphs feed on leaves and leaf litters. Nymphs will feed on host plants of which they were oviposited.
Conservation Status: Stable
Austin Bug Collection. Photo and Information
Gates, Dell E., and Leroy L. Peters. Insects in Kansas Rev. Ed. Manhattan: Kansas State University, 1962
White, Richard E., Donald J. Borror, and Roger T. Peterson. A Field Guide to Insects: America North of Mexico (Peterson Field Guides). 2nd Ed. Boston: Houghton Mifflin Harcourt, 1998
McPherson, J.E., and S.M. Paskewitz. "Life History and Laboratory Rearing of Euschistus Ictericus (Hemiptera: Pentatomidae) with Description of immature Stages." New York Entomological Society. Vol. 92. (1984): 53-60.
Submitted by: Christopher Nguyen, November 2011