Cimicine: an oily fluid of disagreeable odor secreted by certain Heteroptera and used as a means of defense.
"Explanation of Terms Used in Entomology" by John. B. Smith
These papers are based on a study of many species of the Hemiptera heteroptera.
"Studies in Spermatogenesis" by Nettie Maria Stevens
The Heteroptera cannot exactly be said either to sting or bite.
"On the Origin and Metamorphoses of Insects" by Sir John Lubbock
There are also very many different sorts of Heteroptera, including the numerous family Notonectidae.
"Old Flies in New Dresses" by Charles Edward Walker
The order is divided into two sub-orders, the Heteroptera and the Homoptera.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 3" by Various