122 MR. A. T. JANSE 



but I have never had the opijortuuity of seeiug more of 

 the plant than the "beans''. It seems that all the fruit 

 are inliabited by tlie larvae, as a f^otnid seed never came 

 to my notice nor to the notice of the collectors who sent 

 the "beans" on to me. I also received far too little 

 material to ask tlic help of a specialist to identiiy the 

 plant Ihat produces the fruit. As the generic characters 

 of this family are founded on the structure of the seed, 

 however, it will be impossible to identify the genus ex- 

 cept approximately. 



The larvae tliat I found inside differed very little fr(»m 

 other larvae that live inside plant parts, except that it 

 was very thick in the middle probably due to abnormal, 

 development of the muscular s^'stem in that i*egion. 

 When taken out of the "bean", it always maintained a 

 semi-circular position, and the size was certainly too 

 big to allow the full grown larva to stretch itself when 

 inside the "bean ". This fact I think of great importance 

 in the explanation of the jumping power of the larva. 

 When the larva came to me they were full grown and 

 the fruit consisted of the empty shell only, yet they re 

 mained in this larval stage from Xovember 2.'^rd, 19ns. 

 till June next year, when 1 found the first pupa inside 

 those '^ beans '' that did not jump any more. Some of 

 tJiem even pupated as late as October the 8th, or nearly 

 a year after being apparently full grown. During the 

 larval stage the "beans'' jumped every now and then, 

 often to a lieiglit of uoi less than an inch, and when left 

 by themsclvi^s in an (>{(en shjillow box for some days they 

 would all gradually disappeai". When about a Imndred 

 were confined in a cardboard box they would keep up i 

 rattling noise, that nevei* quite ceased, but that became 

 more j)ronouMc(Ml when the box was ex}>osed to lient. f 

 often observed that some of them kept on jumping every 

 two or three seconds for s(>veral minutes when a short 

 jteriod of rest would be enjoyed, to l)egin llu^ jum])ing 

 again, especially when the temperature was rather high. 

 One naturally asks the use of lliis movement, but I must 



