Forest entomology . Fig. 209.—Female scales of Lecaniumcapreae, scale, on sycamore. 220 FOREST badly infested with brown scale. For example, a comparativelysmall specimen of Croton will often serve the purpose. In order tounderstand the structural details, it is best to prepare and mounta young adult, and examine it under the inch objective. It is thenadvisable to carefully look for all the characters found in fig. the first place, see the mouth and sucking-tube, as at a and b. The antennse (fig. 211) should bewell studied, as the number andrelative lengths of the jo
Forest entomology . Fig. 209.—Female scales of Lecaniumcapreae, scale, on sycamore. 220 FOREST badly infested with brown scale. For example, a comparativelysmall specimen of Croton will often serve the purpose. In order tounderstand the structural details, it is best to prepare and mounta young adult, and examine it under the inch objective. It is thenadvisable to carefully look for all the characters found in fig. the first place, see the mouth and sucking-tube, as at a and b. The antennse (fig. 211) should bewell studied, as the number andrelative lengths of the joints oftenafford important points in classifica-tion. At c c c c we get the openingsleading to the spiracles or stigmata,and these structures may be carefullystudied. At d we find the analplates or lobes ; at e the anal cleft;and at / the marginal spines. Allthese structures are clearly displayedin the young adults. The legs, likethe antennae, should also be care-fully noted under the field of themicroscope. But while the microscopist thusgains a general idea of the struc-ture, the fully developed brownscale
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