Economic entomology for the economicentomolo00smit_0 Year: 1896 STRUCTURE AND CLASSIFICATION. 21 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 be filiform, 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 a
Economic entomology for the economicentomolo00smit_0 Year: 1896 STRUCTURE AND CLASSIFICATION. 21 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 be filiform, 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 such a serrated form we pass gradually into the Fig. 8. Antennal types.—a, filiform and pubescent; b, serrate; c, singly pectinate; d, bipecti- nate; e, clavate ;/, 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 bzpec- ti7iated 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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