. Principles of economic zoo?logy. Zoology, Economic. HEMIPTERA 141 of plants. The sucking beak consists of the lahiuin, which, to- gether with the labial palpi, is modified into a jointed sheath. This incloses the mandibles and maxillae, which are changed into long, piercing stylets.^ The labrum or upper lip is small or rudimentary. There are usually four wings. In the typical Hemiptera, as exemplified in the sub-order Heterop'tera, the character of the anterior wings is a distinguishing feature. The basal portions of these wings are thickened and parch- ment-like, while the terminal portions
. Principles of economic zoo?logy. Zoology, Economic. HEMIPTERA 141 of plants. The sucking beak consists of the lahiuin, which, to- gether with the labial palpi, is modified into a jointed sheath. This incloses the mandibles and maxillae, which are changed into long, piercing stylets.^ The labrum or upper lip is small or rudimentary. There are usually four wings. In the typical Hemiptera, as exemplified in the sub-order Heterop'tera, the character of the anterior wings is a distinguishing feature. The basal portions of these wings are thickened and parch- ment-like, while the terminal portions are membranous and overlap when the wings are folded over the back. From the character of these wings the order gets its name—henii, 'Fig. 111.—Bed-bug [Ci'mexlectular'ius): a, Adult female gorged with blood; h, same from below; c, rudimentary wing-pad; d, mouth parts. All enlarged. (Marlatt, Bull. U. S. Dept. of Agriculture, 1896.) and pteron, a wing, i. e., the Hemip'tera or " half-winged " insect. The second pair of wings are membranous and fold un- der the fore wings when not in use. The electric-light bugs, bed-bugs, water-bugs, and squash-bugs are familiar examples. In the sub-order Homop'tera the anterior wings are not thick- ened, but are of the same structure throughout, as in the cicada. In the sub-order Parasl'ta are found wingless parasitic hemip- tera which prey upon certain mammals, for example, the head and body lice of man, dogs, cattle, hogs, sheep, mice, and rabbits. ' See Kellogg, p. 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 Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B. Saunders
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