POMPONIA. 



113 



to the tegmina, which is shorter than the fourth, while those areas 

 are about equal in length in Westwood's species ; the greatest 

 width of the tegmina is scarcely more than a third of their 

 length ; opercida ochraceous, narrowly margined with black and 

 obliquely black at base, in shape and length resembling those of 



Fig. 49. — Pom]30iiia intermedia. 



P. imperatoria. Allied to P. merula, Dist. (from Borneo), by the 

 relative breadth and length of tegmina, and by having the third 

 apical area to the same shorter than the fourth, but differing 

 by the shape and length of the opercula. 



Length excl. tegm., d", 64 ; exp. tegm. 176 millim. 



JIab. Tenasserim, Thaungyin Valley (Bingham, Brit. Mus.). 



The structural differences of the three species are expressed in 

 the following synopsis : — 



A. Opercula about as long as broad. 



a. Greatest width of tegmina much more than a third 

 of their length. 

 h. Third apical area to tegmina about as long as 



fourth P. imperatoria. 



act. Greatest width of tegmina about or little more 

 than a third of their length. 

 bb. Third apical area to tegmina shorter than 



fourth P. intermedia. 



B. Opercula broader than long P. merula. 



TOL. III. I 



