Bulletin . a species of Tachina,while that of Basilarchia disippiis is apparenth free fromthe attacks of parasites. The two larvae are widely dif-ferent in form and color. See Figs. 20 b, and 12 b. Here,again, the resemblance is to be accounted for on the groundof natural selection rather than on that of any choice on thepart of the individual. -38-. THE STRUGGLE FOR EXISTENCE. The law of natural selection, that is, the natural survi-val of the fittest for the conditions of life, prevails here aswell as elsewhere in the animate world. There is a con-stant warfare of life upon life. Birds, beet
Bulletin . a species of Tachina,while that of Basilarchia disippiis is apparenth free fromthe attacks of parasites. The two larvae are widely dif-ferent in form and color. See Figs. 20 b, and 12 b. Here,again, the resemblance is to be accounted for on the groundof natural selection rather than on that of any choice on thepart of the individual. -38-. THE STRUGGLE FOR EXISTENCE. The law of natural selection, that is, the natural survi-val of the fittest for the conditions of life, prevails here aswell as elsewhere in the animate world. There is a con-stant warfare of life upon life. Birds, beetles, and thousandsof diptera, hemiptera, and hymenoptera carry on a waragainst butterflies and moths which would result in exter-mination, were it not for the kind provisions of creative wis-dom. Nature is full of compensations. For weakness thereis an added cunning-. For exposure, there is a protectiveresemblance that deceives the keenest vision. Even enemiesmay be blessings to the species,—blessings in a species to multiph unchecked it would soon workout its own extinction. I have seen elm trees complete!}stripped of foliag^e b}- the larvae of the Spring Canker Wormlong before they had reached maturity. Thousands haddropped to the ground and were crawling about in search ofof food. Without doubt the majoritv of them perishe
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