Abstract

In the Diptera, tarsal contact chemoreceptors have been found in the following species: Phormia regina, P. terraenovae, Phaenicia sericata, Calliphora vomitoria, C. vicina, Cynomyopsis cadaverina, Callitroga macellaria, Stomoxys calcitrans, Musca domestica, Drosophila melanogaster, Tubifera sp., Tabanus sulcifrons (references to original studties in Frings and Frings, 1949) and Aedes aegypti (Frings and Hamrum, 1950). These represent only six families of this large and important order of insects. Tarsal chemoreceptors have been reported as being absent in Rhagoletis pomonella2 (Trypetidae) by Middlekauf (1941), the only species of fly tested so far in which these receptors have not been found. Labellar contact chemoreceptors have long been assumed to exist in the Diptera. They have been proved to exist, however, only in Phormia regina, Calliphora vomitoria, C. vicina, Phaenicia sericatta, Musca domestica, Tubifera sp., Tabanus sulcifrons (Frings and Frings, 1949) and Aedes aegypti (Frings and Hamrum, 1950). No exceptions have been reported for any flies tested. The present paper reports studies on two species of Diptera-the cherry fruit fly, Rhagoletis cingulata (Trypetidae) and the flesh fly, Sarcophaga bullata (Sarcophagidae). Studies on the first species test the possibility that this may represent an exceptimn to the rule in Diptera. Studies on the second add data on the location of contact chemoreceptors in a species from a family whose members have not previously been tested.

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