11:3 



Notes on a Day's Insect-Collecting in the Waianae Mountains, 

 Oahu. 



BY OTTO ir, SWEZEY. 



The Waianae ^ronntains are much less accessible to us than 

 the Koolau Mountains, especially the portion of the latter range 

 near Honolulu, where there are numerous trails penetrating 

 easily to the regions good for insect-collecting. To those of us 

 who have been collecting in the latter region the past few years 

 there iu, no doubt, much that would be new and interesting to 

 be found in the Waianae jMountains, if we should make the 

 effort to go after them. To stimulate interest in this direction, 

 I desire to exhibit the results of my first trip to these moun- 

 tains. 



On October 10th, 1900, in company with two other members 

 of our Society I went by railroad to the end of the line at Scho- 

 field Barracks, on the plateau occupied by the Leilehua Ranch. 

 From the Barracks we tramped across the slowly-rising plateau 

 westward to the moimtains, for about two miles following the 

 road leading to the Kolekole pass, w^hich leads to the Waianae 

 side of the range. ]^ear the mountains we left this road and 

 passing some distance to the right ascended the first valley lead- 

 ing into the range to the north from Kolekole pass. Cattle 

 range this valley clear to the top, and hence it is very easy to 

 traverse it as the lantana and underbrush have been largely 

 trampled down ; so that the valley is quite open, in this resj^ect 

 too much so for good insect-collecting. But there are places 

 where collecting is good and the valley being open makes them 

 easy of access. 



From the crest of the ridge a fine view is ol)tained of the 

 country on the Waianae side of the range, as also of the whole 

 of the Leilehua ranch, and the pineapple fields of Wahiawa. For 

 a day's trip the time is not sufiicient (11 a. m. to 3 :45 p. m.) for 

 much collecting, but I have the following to show for it : 



Hymenoptera — 5 Odynerus nigripennis; 3 0. nioiitanus; 

 1 Nesodijnenis rudolphi ; 1 Sclerodci'ma Jcaalaf ; 2 Sierola sp. ; 

 1 Eupelmus sp. ; 1 Gonntopiis perTcinsi (a leafhopper parasitized 

 by it) ; and 1 Ecphylopsis nir/ra, a wingless Braconid of which 



Proc. Haw. Ent. Soc. II, No. 3, ]\Iay, 1910. 



