F. R. Petherbridge and M. A. Husain 



191 



antenna now shorter than the second joint which is the longest; the third 

 joint shorter than the fourth. Wing pads, small thickened lobes at the 

 posterior angles of meso- and metanotum, the former being slightly larger. 

 The wing pads become darker when the nymph is about to moult. Other 

 characters similar to Instar II, the yellow spot on the abdominal seg- 

 ment III being rather faint. 



Instar IV (PI. X, fig. 8). Length 1-33-1-99 mm. 



Characteristic structural peculiarities. A further increase in the relative 



Table I. Plesioooris rugioollis (measurement in millimetres). 



