22. THE RICE GRASSHOPPER 



1 b. Record of 9 I'emales : — 



Hatched, 15-6-10. First assumed adult form, 10-9-10. 

 Last assumed adult form, 28-9-10. 

 Length of developmental period 87-105 days. 



2 a. Record of 6 males : — 



Hatched, 25-6-10. First assumed adult form, 2-9-10. 

 Last assumed adult form, 26-9-10. 

 Length of developmental period 69-93 days. 



2 b. Record of 3 females : — 



Hatched, 25-6-10. First assumed adult form, 13-9-10. 

 Last assumed adult form, 27-9-10. 

 Length of developmental period 80-94 days. 



3 a. Record of 4 males : — 



Hatched, 18-7-10. First assumed adult form, 3-10-10. 

 Last assumed adult form, 12-10 10. 

 Length of developmental period 77-86 days. 



3 b. Record of 4 females :- — 



Hatched, 18-7-10. First assumed adult form, 14-10-10. 

 Last assumed adult form, 23-10-10. 

 Length of developmental period 88-97 days. 



It is possible that the results above recorded slightly 

 exceed the noimal as it frequently happens, in rearing 

 insects in captivity, that they do not develop so rapidly as 

 in the open. However, this does not seem to apply, to 

 any great extent, in the case of the Eice Grasshopper. 

 Careful observations made in the field, as well as measure- 

 ments of captured and reared specimens, indicate that the 

 development in captivity is normal and that development 

 in the open takes place as slowly as in captivity. 



In this connection, a series of observations, made in 

 the field at the beginning of October, may be recorded 

 as illustrating the shorter developmental period in males. 

 Four sweeps with a bag were made along grassy bunds 

 in different places and, in each case, the total catch was 

 examined with the following results : — 



First stoeep- ( 18 adults = {^\\ 



Total catch 34 = m^ , _ ' 5 J 



1 16 nymphs - i n $ 



Second stcec)) — fon i u — ' 13 c? 



•* ' 20 adults — 



Total catch 26 = 



( 7 ? 

 6 nymphs = all 5 



Tliirdsiveep- [49 adults = jjj ^ 



Total catch 71 = "Lo , _ ^ 4 c? 



22 nymphs = \i8 ? 



