Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomolo00smit Year: 1906 STRUCTURE AND CLASS//'VCATION. 2i mon types of antennal structure, which occur in all insects, that they may be referred to hereafter without especial description. The antennae are said to heji/i/onn, or thread-like, when the joints are nearly even throughout, cylindrical, tolerably equal in length, and similar in general appearance. A serrate or saw- toothed antenna has the joints more or less triangular in shape and so fitted that one m
Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomolo00smit Year: 1906 STRUCTURE AND CLASS//'VCATION. 2i mon types of antennal structure, which occur in all insects, that they may be referred to hereafter without especial description. The antennae are said to heji/i/onn, or thread-like, when the joints are nearly even throughout, cylindrical, tolerably equal in length, and similar in general appearance. A serrate or saw- toothed antenna has the joints more or less triangular in shape and so fitted that one margin resembles the toothed edge of a saw. Quite frequently antennae of this type are distinctly flat- tened. From sucli a serrated form we pass gradually into the Fig. 8. Antennal types.—a, filiform and pubescent ; A, serrate ; c, singly pectinate; d, bipecti- nate ; e, clavate ; y, capitate; g, geniculate; h, lamellate. pectinated or comb-toothed type, where the joints are furnished laterally with processes of variable length. When both sides of the joints have these processes the antenna is said to be bjpec- tifiated or feathered ; when the processes become very slender, almost hair-like, and exceedingly numerous, it is said to be plumose. A feeler is clubbed, or clavate, when the joints toward or at the tip suddenly or gradually enlarge to form a more or less evident club or bulb, and this type is widely distributed in all the orders, a variety of terms being in use to indicate the particular form of the club. A lamellate feeler has at its tip a series of elongate, flattened or leaf-like joints, usually applied close together to form a solid mass that conceals and protects
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