There is no distinct pharynx, oesophagus, and proventriculus in the fore-intestine. The oesophagus is narrow anteriorly, gradually increasing in diameter until it empties into the mid-gut. The comparative size of the anterior, middle and posterior regions of the oesophagus may be noted in Plate II, Figures 1, 2 and 3. The gradual enlargement of the oesophagus is the only semblance of a proventriculus or gizzard. A lack of a definite chamber of mastication is typical of pollen feeding insects. The fore-intestine extends into the mid-intestine forming a pronounced oesophageal valve (Plate III, Fig. 5). There is no external indication of this valve.