dusky stink bug

(Euschistus tristigmus)

Conservation Status
dusky stink bug
  IUCN Red List

not listed

     
  NatureServe

not listed

     
  Minnesota

not listed

     
           
           
           
 
Description
 
 

Dusky stink bug is a small, broad, dark brown to gray stink bug. It occurs in the northern United States above the 41st parallel and east of the Great Plains, and across southern Canada from coast to coast. It is common in Minnesota. It can be found in grasslands and hayfields but is more common in wooded areas. There are two subspecies of Euschistus tristigmus. Only the northern subspecies, E, t. luridus, is found in Minnesota. The southeastern subspecies, E, t. tristigmus, is smaller and has acute to spine-like humeral angles.

Adults are to ½ long and ¼ to 5 16 wide, smaller than other stink bugs in its genus.

The head is small and narrow, much narrower than the thorax. It is tucked into a concave groove in the margin of the pronotum. There is no visible “neck” when viewed from above. There are two large, bulging, compound eyes and two small simple eyes (ocelli). There is no crosswise (transverse) groove between the compound eyes. The snout-like projection (rostrum) on the head is small and slender. It fits neatly between two exoskeletal plates. The mouth parts are optimized for piercing and sucking, and take the form of a thick, curved, 3-segmented beak. The beak is longer than the head and fits into a groove on the underside of the sternum when not in use. The antennae are exposed, conspicuous, slender, and long, much longer than the head but not as long as the body. They have five segments. The first segment is thicker than the second. The fifth segment and the last (apical) half of the fourth segment are dark brown to black. The remainder is orangish or reddish.

The body is shield-shaped and elongated but no more than twice as long as wide. The upperside is gray, hairless, and densely covered with dark brown punctures. The angles in the shoulder (humeral) area on each side are rounded and have no projecting tooth. The lateral margins toward the front are scalloped to toothed.

There are two pairs of wings, and they are held flat over the body when at rest. The forewings (hemelytra) on the mature adult are as long as the abdomen but do not completely cover the sides of the abdomen. The sides of the abdomen are exposed and appear conspicuously striped when the wings are closed. The hemelytra have a thickened section at the base and a thin membranous section at the tip with a clear dividing line between the two. The thickened basal part is comprised of a triangular section (scutellum) at the base; a narrow area (clavus) behind the scutellum when the wings are closed; and the remaining, broad, marginal area (corium). The scutellum is triangular and large, covering about half of the abdomen, but is not longer than the corium, and not reaching the tip of the abdomen. The tip of the scutellum is white or yellow and is mostly free of punctures. There is a dark spot, more a smudge, in the middle of the scutellum, and a similar but smaller spot in the middle of each corium. The spots are diffuse and may be barely visible. The hindwings are thin, membranous, and concealed under the forewings.

The underside of the body is pale, contrasting sharply with the dark upper side. There are one to four black spots on the underside in the middle (medial) of the abdomen.

The legs are pale. The fourth segment of the hind leg (tibia) is grooved above. It does not have spines. The end part of the leg, corresponding to the foot, (tarsus) has 3 segments.

 
     
 

Size

 
 

Total Length: to ½

 
     
 

Similar Species

 
     
     
 
Habitat
 
 

Woodlands

 
     
 
Biology
 
 

Season

 
 

Late May to early October

 
     
 

Behavior

 
 

 

 
     
 

Life Cycle

 
 

Adults overwinter in leaf and plant litter. In the spring, the female lays clusters of barrel-shaped eggs in tight rows on the underside of leaves.

 
     
 

Nymph Food

 
 

Plant juices

 
     
 

Adult Food

 
 

Plant juices

 
     
 
Distribution
 
 

Distribution Map

 

Sources

7, 24, 27, 29, 30.

 
  10/5/2020      
         
 

Occurrence

 
 

Common

 
         
 
Taxonomy
 
 

Order

Hemiptera (true bugs, cicadas, hoppers, aphids and allies)  
 

Suborder

Heteroptera (true bugs)  
 

Infraorder

Pentatomomorpha (pentatomomorph bugs)  
 

Superfamily

Pentatomoidea (stink bugs, shield bugs, and allies)  
 

Family

Pentatomidae (stink bugs)  
 

Subfamily

Pentatominae  
  Tribe Carpocorini  
 

Genus

Euschistus  
 

Subgenus

Euschistus  
       
 

Subordinate Taxa

 
 

dusky stink bug (Euschistus tristigmus luridus)

dusky stink bug (Euschistus tristigmus tristigmus)

 
       
 

Synonyms

 
 

Pentatoma tristigma

 
       
 

Common Names

 
 

dusky stink bug

 
       

 

 

 

 

 

Glossary

Corium

The thickened basal portion of the front wing that lies between the clavus and the membrane of insects in the family Hemiptera.

 

Hemelytron

The forewing of true bugs (Order Hemiptera), thickened at the base and membranous at the tip. Plural: hemelytra.

 

Ocellus

Simple eye; an eye with a single lens. Plural: ocelli.

 

Pronotum

The saddle-shaped, exoskeletal plate on the upper side of the first segment of the thorax of an insect.

 

Rostrum

The stiff, beak-like projection of the carapace or prolongation of the head of an insect, crustacean, or cetacean.

 

Scutellum

The exoskeletal plate covering the rearward (posterior) part of the middle segment of the thorax in some insects. In Coleoptera, Hemiptera, and Homoptera, the dorsal, often triangular plate behind the pronotum and between the bases of the front wings. In Diptera, the exoskeletal plate between the abdomen and the thorax.

 

Tarsus

The last two to five subdivisions of an insect’s leg, attached to the tibia; the foot. Plural: tarsi.

 

Tibia

The fourth segment of an insect leg, after the femur and before the tarsus (foot).

 

 

 

 

 

 
 
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Alfredo Colon

 
    dusky stink bug   dusky stink bug  
           
 
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About

Published on Sep 17, 2017

DUSKY STINK BUG

 
       

 

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  Alfredo Colon
8/2/2019

Location: Woodbury, Minnesota

dusky stink bug  
  Alfredo Colon
6/10/2018

Location: Woodbury, Minnesota

dusky stink bug  
           
 
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