. A manual for the study of insects. Insects. LEPIDOPTERA. 249 not indicate that these larvae are inconstant in their habits. In fact, the opposite is the case. Each species of Tineid infests a particular species of plant, or, at the most, several closely allied plants. And each species makes a mine of definite shape, although some species exhibit different habits in the different stages of their growth. So constant are these creatures in their habits that in most cases an expert can determine the species of Tineid that made a mine by merely examining the infested leaf. The various kinds of mi
. A manual for the study of insects. Insects. LEPIDOPTERA. 249 not indicate that these larvae are inconstant in their habits. In fact, the opposite is the case. Each species of Tineid infests a particular species of plant, or, at the most, several closely allied plants. And each species makes a mine of definite shape, although some species exhibit different habits in the different stages of their growth. So constant are these creatures in their habits that in most cases an expert can determine the species of Tineid that made a mine by merely examining the infested leaf. The various kinds of mines can be classed under a few distinct types. The long, narrow, and more or less winding mines are described as linear mines. Some of these are very narrow at their beginning and grad- ually enlarge, resembling in outline a serpent; fre- quently the larger end is terminated by a blotch- like enlargement, suggest- ing a head. Such mines are termed serpentine mines. The leaves of the wild columbine are often marked by serpentine mines (Fig. 297). Other mines that start from a narrow beginning enlarge more rapidly and extend in a more or less regular curve; these are trumpet mines, A common example of a trumpet mine is that made by the larva of Tischeria malifoliella (Tis-che'ri-a mal-i-fol-i-el'la) in the leaves of apple. The mines of many species are mere disk-like blotches ; these are referred to as blotch mines (Fig. 298). Blotch mines differ in position; some are immediately beneath the upper epider- mis, while others are nearer the lower surface of the leaf. This distinction exists also in most of the other types of. Fig. 297.—Leaf with serpentine 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 Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. joint author. Ithaca, N. Y. , Co
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