221 



In the males, when the teigmina are 6.5-8.5 mm. long, they 

 extend over 5 to 7 segments of the abdomen, and the wings are 

 .25-1 mm. shorter; when the tegmin'a are 10.5 mm. long, they 

 extend over 8 segments of the abdomen, and the wings are 

 about I mm. shorter; when the tegmina are 11 .5 mm. long, they 

 reach the tip of the abdomen, and the wings are about the same 

 length; when the tegmina are 17 mm. long they extend to the 

 apex of the femora, and the wings are 4 mm. longer. 



Observations were ta-ken in different months of the year to 

 determine whether the season made any difTerence in the length 

 of tegmina. The following 'table shows the percentages of the 

 different forms as they occurred in Makiki \'alley, about one 

 mile above the Station: 



1905 



From this, there is obviously no apparent seasonal variation. 



Observations in the cane-fields of the Station grounds were 

 not in accord with this, however. In March, 1905, they were 

 nearly all the shortwinged form; but in August, there were none 

 but the long-winged form. They were c|uite scarce at this time, 

 however, only 25 adult specimens being seen in a half-hour 

 search. In September the condition was similar. Of 36 adults 

 seen in a half-hour search there was but one of the short-winged 

 form. 



The fohowing table shows that the proportion of long and 

 short-winged forms varies considerably in different localities: 



Short-winged form 



Intermediate 



Long- winged form 



lao Vallev, 



Waihiku", 



Maui, 



Sept. 30, 190.5 



18% 



2% 



8o7. 



Kipahulu, 

 Maui, 



Oct. 9, 1905 



16% 



2% 

 82°/ 



Pacific 



Heights, 



Honolulu, 



Oct. 28, 1905 



87% 



2% 

 11% 



H. S. P. A. 

 Ex. Station, 



HonoluUi. 

 Nov. 10, 1905 



100% 



