. Elementary entomology . Fig. 35. Digestive canal of a carabid beetle /i, esophagus ; c, crop ; d, proventriculus ; /, stomach with its caeca ; g, posterior portion of stomach ; //, intestine ; /, two pairs of Malpighian tubes ; k, rectum ; /, anal glands. ' (After Dufour) Intestine. The food passes from the stomach into the intestine through a pyloric valve which prevents its passage backward. The intestine is divided into three fairly distinct parts, the ileum, colon, and recttnn. The length and size of these parts varies greatly ac- cording to the food of the insect, the ileum often being
. Elementary entomology . Fig. 35. Digestive canal of a carabid beetle /i, esophagus ; c, crop ; d, proventriculus ; /, stomach with its caeca ; g, posterior portion of stomach ; //, intestine ; /, two pairs of Malpighian tubes ; k, rectum ; /, anal glands. ' (After Dufour) Intestine. The food passes from the stomach into the intestine through a pyloric valve which prevents its passage backward. The intestine is divided into three fairly distinct parts, the ileum, colon, and recttnn. The length and size of these parts varies greatly ac- cording to the food of the insect, the ileum often being considerably coiled. In the ileum the digested food materials are absorbed and passed into the blood circulation ; the colon, which is often absent, contains undigested matter and waste products ; while the rectum has thick, muscular walls and expels the feces through the anus, which opens through the last segment of the abdomen. Malpighian tubes. Opening into the intestine, just back of the stomach, are several small, slender tubes, variable in number, in which uric acid is found, and which are considered to be excretory organs similar in function to the kidnevs of hig-her animals.
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
