. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 52 LEAFHOPPEES AFFECTING CEREALS, ETC. ovipositor, this latter being a narrow sawlike pair of blades extending to the tip, sometimes considerably beyond tlie tip of the sheaths. The males have for the terminal segment beneath a modified segment, called the valve, which is followed by two liiovable pieces called plates. Above these, forming the sides of .the last segment, are the 'pygofers. A ready understanding of these various parts will be helped by a study of the accompanying figure 1, in which they are locate
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 52 LEAFHOPPEES AFFECTING CEREALS, ETC. ovipositor, this latter being a narrow sawlike pair of blades extending to the tip, sometimes considerably beyond tlie tip of the sheaths. The males have for the terminal segment beneath a modified segment, called the valve, which is followed by two liiovable pieces called plates. Above these, forming the sides of .the last segment, are the 'pygofers. A ready understanding of these various parts will be helped by a study of the accompanying figure 1, in which they are located y /£/;?_. Fig. 1.—Explanation of terms from drawing of 4 ^ftysoKMSob^M^Ms; a, Female from beneath; 6, from side; c, from above; d, female genitalia; c, male genitalia; /, larva or nymi)h; g, eggs, showing developing larva; h, egg, enlarged; i, eggs in position beneath sheath of grass stem. Structural details: ac, Apical cells; aac, anteapical cells; cZ, clavus; dj/p, clypeus; coj, coxa;/r, front;/cm. femur; tora, lora; ov, ovipositor; pZa^f, plate; pr, prothorax; W {(J),ry ($), pygofer; tar, tarsus; <i6, tibia; v, vertex; tis, terminal ven- tral segment; wZw, valve. All enlarged. (After Osborn and Ball.) and named. For the different stages of insects the usual terms e^^, larva, or nymph, pupa, and adult are used, as these are sufficiently definite in indicating the steps of development from the egg to the mature form. THE MORE IMPOHTANT SPECIES AFFECTING CULTIVATED CROPS. The Yellow-headed Leafiiopper. {Drseculacephala reticulata Sign.) The yellow-headed leafhopper {DrseculacepJiala reticvlafa Sign.), an extremely abundant species in the southern United States, has been noticed a number of times as destructive in wheat or oats, but has never received any full discussion, and we are still ignorant as to the details of its life history. It was described by Signoret as. Please note that these images are extracted from scanned page images that may have been digitally enhanc
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