52 



region, were almost absent at this time. One Froterliinus and 

 four Oronomiris hawaiiensis were also taken. 



A short visit in the direction of Lahaina was made in fine 

 weather but here again many of the interesting lowland and 

 coast forms of Aculeates were comparatively scarce except in 

 the commonest of species — Odynevus purpurifer, insullcola, 

 smlthii, ruhrotinctiis, Nesoprosopis facilis, Crabro mandihu- 

 laris, and one Carabid were taken. On Ipomoea pes-capiae, I. 

 insuJaris and /. platyphylla a series of Delphacids (Aloha sp.) 

 were taken but all these are apparently the common A. iponioe- 

 icoJa. The extreme variations in color of this Delphacid as 

 captured on these three species of Ipomoea is very marked 

 and notwithstanding that all were taken at praciicallv the 

 same elevations and within a few hundred feet of each other. 

 There is room for study as to why these extreme variations in 

 the color exist in some of our commonest Delphacids, and the 

 theory already advanced in Mr. Muir's notes on Hawaiian Del- 

 phacids that this variation is caused in part by the food ])lant 

 appears plausible to some extent. 



On the day of our return to Honolulu a short visit was 

 made to lao Valley, weather conditions being such as to pre- 

 vent a previous tramp in that region. The trails into the 

 valley at the time were practically impassable because of heavy 

 rains, so that w^ were only able to get as far as the iirst 

 crossing of the Wailuku river. At this point on a smal', area 

 of Eragrostis variabilis a long series of both sexes and young 

 of a new species of Kelisia was obtained. This is the first spe- 

 cies of that genus of Delphacids taken on Maui so far as is 

 known. One Proterhinus, several Jassids and Odyncrus ec.os- ■ 

 talus and purpurifer were also taken. 



