﻿170 



The general facies now more closely resembles that of the 

 adult. 



The following- are the principal variations from the previous 

 in star : 



Head, intense black. Antennae with nineteen joints, the ad- 

 ditional three have again arisen from segment 3, but this is not 

 so apparent as in the earlier instars, owing to the excessive pig- 

 mentation ; the shorter form of the extra ones however, is still 

 traceable. The entire antenna black, except usually the 14th 

 and 15th joints, whitish, but this colour is extremely variable at 

 this stage ranging from the 12th to the i6th joint. The an- 

 tennae often vary in this respect in the same individual and not 

 infrequently the white only occurs on a portion of a joint. Pro- 

 notum quadrate, anterior angles square, the posterior rounded, 

 intense black, posterior margin whitish. Mesonotum intense 

 black, distinctly wider than pronotum, the undeveloped tegmina 

 distinctly visible beneath the metanotal plates. Metanotum 

 somewhat broader than mesonotum, posterior edge deeply emar- 

 ginate, caused by the immature wings which are now distinctly 

 visible beneath, forming a pair of well-developed metanotal 

 plates. Metanotum, intense black, except for a whitish semi- 

 lunar area on the inner margin of each lobe. Abdomen, ten 

 dorsal segments, the ist entirely hidden by the metanotal plates, 

 (this segment has already become somewhat dechitinized,) the 

 rest black ; the 2nd segment is also partially covered by the me- 

 tanotal plates. Forceps, similar in form to the previous instar, 

 several minute teeth present along the inner margins, black. 

 Legs, — femora relatively longer than in the previous instar, 

 basal halves black, apical halves and tibiae darkly infuscate, 

 tarsi testaceous, lobe of 2nd tarsal joint more than half the 

 length of the 3rd joint. (Plate VHI, fig. 6.) 



The Adult. 



The last ecdysis occurs at about the 50th day and some 4 days 

 elapse before the final black coloration is attained. 



The adults vary very considerably in size ; the following be- 

 ing the range of dimensions observed : 



Males. females. 



Antennae 11 mm. 1 1 mm. 



Head and body 12-17 """"i- ^3-18 mm. 



Forceps 4-7-25 mm. 4-7 mm. 



