140 
Psvche 
[June 
Figs. 11-13. Lateral views. Long setae on lateral abdomen omitted; legs removed 
distal to coxae. Arrow indicates gap through which ventral air store communicates 
with subalar air store, which contains aouominal spiracle (broken circle;. 
Fig 11. D. zealandiae. Fig. 12. M. sedula. Fig. 13. H. interrupta. 
In all three corixids studied here the part of the pronotum which 
is overlapped by the head bears hydrofuge hairs which help to 
retain the air store. In Hesperocorixa this area, unlike the exposed 
part of the sclerite (Figs. 10 and 13, N I), has a pruinose texture 
similar to that of the embolium of the wing. The scanning electron 
microscope shows that in Diaprepocoris and Micronecta the 
exposed posterior parts of the pronota (Figs. 8, 9, 11, and 12, 
