106 



the stunted bushes and ferns, at an elevation of about 2500 feet, 

 along the path on the southern ridge leading up to the summit of 

 Mt. Konahuanui, Oahu. On account of the general sweeping by 

 the insect net, when these were caught, it was impossible to de- 

 termine their food-plant. It is hoped that at some future time 

 further observations may be made at this same locality and more 

 learned of this remarkable insect. 



Life History and Notes on the Pink-winged Tryxalid (Atracto- 

 morpha crenaticeps Blanchard). 



By Otto H. Swezey. 



This grasshopper is a somewhat recent arrival to the Hawaiian 

 Islands. It probably came from Australia, as it occurs there and 

 also in New Guinea. It has been seen in and around Honolulu 

 for several years, and is probably generalh' spread thruout 

 Oahu; but has not as yet been seen on the other islands of the 

 group. It has not as yet become much of a pest, altho it is 

 strictly a vegetable feeder. It is not, however, a grass feeder 

 particularly, but feeds upon most all kinds of garden plants and 

 weeds, without much particular choice. 



This species is dimorphic as regards color, there being a green 

 form and a grey form. This applies to both sexes. Probably 

 the numbers of each form are about equal; but locally sometimes 

 one form is the more numerous and sometimes the other. This 

 dimorphism appears as early as the second instar of the nymph ; 

 but is not constant thru the succeeding instars; as there may 

 be several changes before the final molt. This is shown in the 

 following table, which is the record of nymphs that were captured 

 of various ages and reared to maturity: 



DIMORPHISM OF NYMPHS. 



