MICROLEPIDOPTERA OF PHILIPPINE ISLANDS 269 



5 and 6 may be remote, connate or stalked. The distribution does 

 not seem to be entirely certain, since G. captiosella may prove to be a 

 complex of several similar species. 



Male genitalia: Tegmnen moderate, bases going down far ventrad. 

 Uncus distinct, bilobed, each lobe with a small crochet, bristly. 

 Gnathos with arms moderate, angulate hook forming a moderate 

 rising triangular plate with a produced aciculose point. Vinculum 

 bandhke, moderately dilated in middle. Saccus long and very 

 slender, with a moderately dilated top. Valva rather narrow, ex- 

 curved, cucullus rounded, sacculus absent. Aedeagus long, slender, 

 tubular. 



Female genitaha: Seventh segment elongate, caudal edge of ven trite 

 rounded-prominent. Intersegmental membrane between 7 and 8 long. 

 Eighth segment moderately sclerotized. Sterigma, a cardiform weak 

 plate, partially covered by two large semioval lateral folds. 



Gerontha captiosella Walker forma 9 capna, new form 



Figure 765 



Female, 28-38 mm. Similar to the typical form but with hindwing 

 opaque, greyish bronze, with darker veins. Hairs on posterior tibia 

 often grey. 



The female genitaha show no tangible differences from those of the 

 typical form. 



Material examined: Luzon, Mt. MakiHng (Baker), 1 9, holotype, 

 genit. sUde 5271; 5 9, paratypes. 6 9 (USNM). 



Gerontha monostigtna, new species 



Figures 433, 766 



Male, 26 mm. Head and thorax whitish, mixed and suffused with 

 grey. Palpus with basal segment brushy with scales, median seg- 

 ment slender at base, abruptly expanded and brushy towards top; 

 purple black, top of median segment white, terminal segment, base, 

 middle, and tip mixed with pm-ple. Antenna fuscous. Abdomen 

 blackish purple. Legs, anterior and median black, tarsi white below 

 posterior grey mixed with purple, tibia whitish, grey towards apex, 

 long hairs above grey, posterior tarsus white, each segment with a 

 blackish-purple wreath of short spines at the top. 



Forewing narrow, sublanceolate, pointed, dorsum sinuate. Vein 

 2 connate with the stalk of 3+4, 7 and 8 long-stalked, 9 out of stalk 

 close to base. Creamy white, glossy, markings dark pm'ple. A 

 marginal row of small dots around the wing; a larger, rather con- 

 spicuous quadrate-trapezoidal spot on costa beyond 2/3 (opposite 

 closing vein), limited below by upper edge of cell, foUowed by two 

 elongate marks posteriorly, ultimate mark smaller, subapical; irregu- 



