Forest entomology . Fig. 276. — Wing of Schizoneura ulnii, ivith third vein once forked. which serve for the exudation of a liquid substance known as honeydew ; others have Fig. 277.—Wing 0/Pemphigus pallidum,ivith third vein straight. Fig. 278.—Wing o/Chermes abietis,with third vein straight. The honey-dew itself is a substance which has given rise to a gooddeal of interesting thought and speculation. It is of a saccharinenature, and is consequently sought after by other insects, more APHIDID^E. 293 especially ants, which not only sip the juices but extract the honey-dew from the aphis
Forest entomology . Fig. 276. — Wing of Schizoneura ulnii, ivith third vein once forked. which serve for the exudation of a liquid substance known as honeydew ; others have Fig. 277.—Wing 0/Pemphigus pallidum,ivith third vein straight. Fig. 278.—Wing o/Chermes abietis,with third vein straight. The honey-dew itself is a substance which has given rise to a gooddeal of interesting thought and speculation. It is of a saccharinenature, and is consequently sought after by other insects, more APHIDID^E. 293 especially ants, which not only sip the juices but extract the honey-dew from the aphis by squeezing it from the cornicles. I have oftenobserved ants doing this on the aphides on elder. The honey-dew is very injurious to vegetation, for not only does ithave a tendency to choke up the stomata or breathing-pores of theleaves, but the injury is still furthur increased by the honey-dewforming a lodgment for soot, dust, and dirt. The tail, though not an important appendage in the discriminationof genera or species, must not be forgotten in generic distinction, inas-much as it is long in some, and short or entirely absent in others. The life-history of an aphi
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