The Poplar tree is infested by an other species of Saperda (S. calcarata). This is a much larger beetle than those above mentioned, being an inch or a little more in length. It is grey, irregularly striped, with ochre, and the wing-covers end in a sharp point. The grub (Fig. 105 _a_; _b_, top view of the head; _e_, under side) is about two inches long and whitish yellow. It has, with that of the Broad-necked Prionus (P. laticollis of Drury, Fig. 106, adult and pupa), as Harris states, "almost entirely destroyed the Lombardy poplar in this vicinity" (Boston). It bores in the trunks, and the beetle flies by night in August and September. We also figure the larva of another borer (Fig. 107 _c_; _a_, top view of the head; _b_, under side; _e_, dorsal view of an abdominal segment; _d_, end of the body, showing its peculiar form), the Saperda inornata of Say, the beetle of which is black, with ash gray hairs, and without spines on the wing-covers. It is much smaller than any of the foregoing species, being nine-twentieths of an inch in length. Its habits are not known. We also figure the Locust and Hickory borer (Fig. 108; _a_, larva; _b_, pupa), which has swept off the locust tree from New England. The beautiful yellow banded beetles are very abundant on the flowers of the golden rod in September. [Illustration: 108. Locust Borer.] FOOTNOTES: [Footnote 4: The External and Internal Parasites of Man and Domestic Animals. By Prof. A. E. Verrill, 1870. We are indebted to the author for the use of this and the figures of the Bot fly of the horse, the turkey, duck and hog louse, the Cattle tick, the itch insect and mange insect of the horse.] CHAPTER IX. CERTAIN PARASITIC INSECTS.