179 



the ''ankle knob," the inner apical corner the "heel" and the 

 outer apical corner the "toe." 



The aedeagus is tubular, slightly flattened laterally, a row of 

 spines at apex on dorsal side continuing a short distance on to right 

 side, a short row on ventral side at apex. 



Lanai, Maimalei (Giffard, February) ; Maui, Kahului 

 (Swezey, August, on Scaevola coriacea). 



PI. 2, tig. 17. 



2. A. myoporicola Kirk. 



The genital styles in this species have a distinct ankle; the toe 

 is short and pointed and the heel is pointed. The aedeagus is shorter 

 and flatter than in ipomoeae and the spines different. Spines on anal 

 segment medium size, straight. A series of female specimens from 

 Lanai (Giffard, October) have the granulations on tegmina larger.* 



PL 2, tig. 18. 



3. A. plectrantlii sp. n. 



^ Tegmina not reaching quite to the apex of abdomen. Head 

 brown; vertex, apical portion of face and the clypeus darker between 

 carinae; antennae yellowish; pro and mesonotum dark brown to 

 nearly black; legs light yellow; coxae fuscous; abdomen brown, lighter 

 at base and on hind margin of each segment. Tegmina light yellow, 

 veins concolorous without granules or hairs, a dark mark at end of 

 clavus and end of costal cell spreading inwards; apical margin and 

 apical veins lighter. 



Pygophor very similar to ipomoeae; anal spines short, broad at 

 base, laterally compressed; styles near to ipomoeae but with toe short- 

 er and blunter; aedeagus distinct. 



Length 2 mm.; tegmen 1.3 mm, 

 9 Lighter than male; in immature specimens all light yellow 



Length 2.6 mm. ; tegmen 1.9 mm. 



Hab. Koko Crater, Oahu, on Pledranthus (Swezey, March; 

 Osborn, April). 



At the time Mr. Swezey Avas at Koko Crater he could find 

 no signs of Delphacids on this plant, but from some speci- 

 mens of Plectrmvtlius which he brought back with him nymphs 

 hatched out in Honolulu. Some two weeks later Mr, Osborn 



*Note: — There is a second type of genitalia in which the anal 

 spines are longer and nearer together and the aedeagus longer, more 

 slender and the spines somewhat differently arranged. At present I 

 cannot consider it a distinct species. 



