Abstract
Dolley and Farris (1929) have given a brief resume of the previous work on the peristigmal gland cells of Syrphid larvae, which need not be repeated here. The wide occurrence of these gland cells in the larvae of the higher Diptera has not, however, been generally recognized. Pantel (1901) found them in the larvae of entomophagous muscids, and Keilin (1913) reports their presence in the Mycetophilidae, Psychodidae, Ptychopteridae, Rhyphidae, Trichocera , and in all of the cyclorrhaphous Diptera studied. Yet in the numerous papers that have been published on the larvae of the Trypetidae, no reference to these gland cells has been found, except a bare mention in the article on Anastrepha striata by Keilin and Picado (1920). As these structures present several problems of considerable physiological and histological interest, the present notice of their general occurrence in the fruit-inhabiting Trypetidae may be of value. Rhagoletis pomonella has been selected for illustration, as it is the most generally available form; its larval anatomy has been described by Snodgrass (1924).
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