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They are a species of  jewel bugs  common in continental  Southeast Asia . These bugs  are commonly known as  jewel bugs  or  metallic shield bugs  due to their often brilliant coloration.  These  insects  feed on plant juices from a variety of different species, including some commercial crops such as  Pigeon pea ,  Arecanut ,  Jatropha, etc A vast majority of jewel bugs, both adults and nymphs, are also capable of releasing pungent defensive chemicals from glands located on the sides of the thorax. Typical compounds exuded by jewel bugs include alcohols, aldehydes, and esters. Nymphs and adults often exhibit clustering behavior, being found in large numbers close to each other. This behavior is thought to have an evolutionary advantage. The more individuals present in an area, the stronger the odor of the chemicals released when the bugs are threatened. If this fails, stink bugs w...

The Stagonomus amoenus belongs to a species that is generally called the stink bug or the shield bug.  They are called shield bugs in English and stink bugs in American English.  The term shield bug refers to the generalized body shape of adult bugs . The name stink bug refers to their ability to release a pungent defensive spray when threatened, disturbed, or crushed. The composition of this spray may vary between species, and even by sex or age, but generally includes  aldehydes  and  alkanes . Descriptions of the smells vary widely, and include oily, dusty, woody and earthy, and like  coriander . In some species, the liquid contains cyanide compounds and a rancid almond scent, used to protect themselves and discourage predators. They have a 5-segmented antennae , The body shape of adults is generally " shieldlike ," when viewed from above. They are coffee coloured and have two white spots on their back. They have small pores all over th...