. Bulletin of the Department of Agriculture. Agriculture. Fig. 16.âBollworm (Heliothis obsoleta), an enemy of the alfalfa caterpillar. Twice natural size. (Author's illustration.) A large green caterpillar, known as the bollworm, Heliothis obso- leta Fab. (fig. 16), which can be distinguished from the alfalfa caterpillar because it is of a lighter green color, about one- fourth larger, hairy, and rough in appearance rather than smooth, with three black lines traversing its body lengthwise, is quite prevalent in the Imperial and Salt River Valleys, and is often mistaken for the alfalfa cat
. Bulletin of the Department of Agriculture. Agriculture. Fig. 16.âBollworm (Heliothis obsoleta), an enemy of the alfalfa caterpillar. Twice natural size. (Author's illustration.) A large green caterpillar, known as the bollworm, Heliothis obso- leta Fab. (fig. 16), which can be distinguished from the alfalfa caterpillar because it is of a lighter green color, about one- fourth larger, hairy, and rough in appearance rather than smooth, with three black lines traversing its body lengthwise, is quite prevalent in the Imperial and Salt River Valleys, and is often mistaken for the alfalfa caterpillar by many farmers. As observed by the writer, and later by Mr. T. Scott "Wilson, it was found to do very little damage to al- falfa, but to be a ravenous enemy of the alfalfa caterpillar, never eat- ing alfalfa as long as it could find the larvse or pupse of Eurymus. Messrs. E. O. G. Kelly and T. H. Parks noted this species at Welling- ton, Kans., in the summer of 1909, and re- ported it as being of a predaceous The writer observed a bollworm larva to eat five large larvae of Eurymus during a single day, and both the writer and Mr. T. Scott Wilson counted dozens of pupal cases with the contents eaten out (fig. 17) and many times with the Heliothis larva still feeding upon and devouring the pupse. Mr. Wilson, on July 15, 1913, remarked in his field notes that " Heliothis was observed in Fig. 17.âChrysalis of alfalfa great numbers feeding upon Eurvmus pupse, caterpillar that has been ^ . ^ '^ ^ i eaten out by a bollworm. and in a icw mstanccs on Eurymus larvse. Enlarged about two diam- rpj^g Heliothis makes a hole in the side of eters. (Original.) i ⢠i the pupa, through which he puts his head and eats out the contents of the ; The writer has observed the end of the abdomen eaten off the pupa; again, an opening would be made on the side, often the entire side being destroyed. â 1 Malloch, J. R. The insects of the dipterous family Phoridae
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