It is a little star-dust caught, a segment of the rainbow which I have clutched.
The whole mass lies in the seventh or eighth segment.
Apical cell, p. Wall marking limit between the plerome k, initial segment of root-cap. P and the pleriblem Pb.
In many of those ants whose third abdominal segment forms a second " node," the basal dorsal region of the fourth segment is traversed by a large number of very fine transverse striations; over these the sharp hinder edge of the third segment can be scraped to and fro, and the result is a stridulating organ which gives rise to a note of very high pitch.
Turning to the thorax we find that the first segment (prothorax) is distinct and free, with a wide dorsal sclerite.