The Hemiptera contain one semi-parasitic species which has attained a "world-wide circulation," and one degraded, purely parasitic group.
"Scientific American Supplement, No. 303" by Various
HEMIPTERA, organs of audition in, 29.
"The Dawn of Reason" by James Weir
HEMIPTERA, protected by bad odour, 72.
"Contributions to the Theory of Natural Selection" by Alfred Russel Wallace
Aquatilia: cryptocerous Hemiptera of truly aquatic habit.
"Explanation of Terms Used in Entomology" by John. B. Smith
In the order Hemiptera, or the true "bugs" in an entomological sense, we find a few forms that may carry disease.
"Insects and Diseases" by Rennie W. Doane
This has not been shown to be the case in any other species of Hemiptera, so far as I can ascertain.
"Studies in Spermatogenesis" by Nettie Maria Stevens
Siphunculata and Hemiptera (lice and true bugs).
"Handbook of Medical Entomology" by William Albert Riley
This treatment is applicable to the orders Coleoptera, Hemiptera, and Orthoptera.
"Directions for Collecting and Preserving Insects" by C. V. Riley
In Hemiptera only eleven and in Collembola only six abdominal segments have been detected.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4" by Various
Vestigial palps have been described in various species of Hemiptera, but the true nature of these structures is doubtful.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 3" by Various