Fig (X)
8.
View of a portion of the duodenum of the grouse, well infested with Hymenolepis microps (Diesing), cut open to show the worms. less millions all over the grouse moors.
They are probably eaten by some insect or land-mollusc, and in the body of these invertebrates change into the cysticercus or larval stage. a The popular notion that grouse do not eat insects is entirely wrong. For the first three weeks of the bird's life the greater part of its diet consists of insects or arachnids, and from the crop of the first grouse I ever dissected I took six saw-fly larvæ, eight caterpillars of a Geometrid moth, one caterpillar of a smaller moth, two small Tineid moths, and a number of Hemipterous insects resembling the frogor cuckoo-spit, a fly, two specimens of plantlice, one small spider, and the remains of four slugs. The gizzard of the same animal contained, in a more broken-up condition, two or three dozen larva of sawsame