Abstract
Two species of flour beetles, Tribolium confusum Du Val and Tribolium castaneum (Herbst), are widely used as laboratory organisms in the field of population ecology. Today, they are also becoming established in laboratories studying artificial and natural selection. In such work it is frequently advantageous, if not even mandatory, to distinguish between the species. For the imaginal stage this is readily accomplished by using the eye and antennal characters given in Hinton's key to the species of Triboliumn (Hinton 1948). However, there is no published account of a technique for distinguishing species in their immature stages. A method is described herewith by which the pupae of Tribolium confusum can be differentiated from those of T. castaneum. Figure 1 is drawn as a dorsal view to show 6 tergites of the pupae of each species. Several differences in the
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