. Entomology for medical officers. Insect pests; Insects as carriers of disease. CHAPTER XXII Stone-flies, May-flies, Dragon-flies, Ant-lions, Scorpion- flies, Caddis-flies Order PlecopTERA : Stone-flies. (Gr. TrXeK-of = plaited, and 7rT6/oo'i' = wing.) A SMALL order, containing only one family, Perlida, closely related to the Orthoptera. The larvae are aquatic, and metamorphosis is " ; The body is Orthoptera-like: all 3 thoracic segments are distinct; the abdomen is composed of 10 segments and. Pro. 116.—Toiirg aquatic Ijarva of Pn-Jld, enlarged. usually ends in a pair of
. Entomology for medical officers. Insect pests; Insects as carriers of disease. CHAPTER XXII Stone-flies, May-flies, Dragon-flies, Ant-lions, Scorpion- flies, Caddis-flies Order PlecopTERA : Stone-flies. (Gr. TrXeK-of = plaited, and 7rT6/oo'i' = wing.) A SMALL order, containing only one family, Perlida, closely related to the Orthoptera. The larvae are aquatic, and metamorphosis is " ; The body is Orthoptera-like: all 3 thoracic segments are distinct; the abdomen is composed of 10 segments and. Pro. 116.—Toiirg aquatic Ijarva of Pn-Jld, enlarged. usually ends in a pair of long, jointed cerci; the antennae are long, slender, and many-jointed : the hind wings are much larger than the front wings, and fold like a fan; but the front wings are membranous, not stiff like those of Orthoptera. When the wings are folded the front wings lie one above the other, so that only one of them is seen. The mouth-narts. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Alcock, A. (Alfred), 1859-1933. London, Gurney & Jackson
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