Abstract
The alimentary tract is described and illustrated for the scutellerine pentatomid Chrysocoris patricius (F.), the coreid Clavigralla gibbosa Spinola, the lygaeid Graptostcthus scrvus (F.), and the pyrrhocorid Dysdcrcus kocnigii (F.). An esophageal valve, guarding the opening into the first ventriculus, varied in structure in the 4 species. Three ventriculi were found in the midgut of G. scrvus, 4 in the other species studied. Secretory activity was both holocrine and by budding, and was found maximal in the first ventriculus. Nidi of reserve cells were not present in these species. Gastric caeca varied in numbers and disposition; they were present in C. patricius, C. gibbosa, and the females (but not the males) of D. koenigii, while G. servus of both sexes lacked not only the caeca but also the fourth ventriculus, where they occurred in the other species. Four malpighian tubules discharged into the pylorus of all 4 species. In none of these forms was there a rectal caecum; however, in all of them the rectum itself was made up of 2 portions with different histologies, and one of these appeared to represent an early stage in the evolution of the rectal caecum in the Heteroptera.
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