62 U.S. NATIONAL MUSEUM BULLETIN 257 



Sycacantha potamograplia, new species 



Figures 72, 534 



Male, 21 mm. Head and thorax dark fuscous, densely marbled 

 and spotted with pale ochreous, lower half of face white (palpi missing) . 

 Antenna fuscous, scape dark fuscous, with a broad pale ochreous 

 apical ring. Abdomen dark fuscous, venter pale ochreous. 



Forewing broad, rather dilated, costa gently curved anteriorly, 

 distinctly curved posteriorly, slightly prominent at 2/3, apex obtusely 

 rectangular, termen straight, vertical, curved below. Pale ochreous, 

 marbled and dusted with blackish fuscous and with lilac. Markings 

 limited, tawny olive, broadly edged with blackish. Basal patch indi- 

 cated by a basal and a marginal, rather well-defined fasciae; basal 

 fascia with a strong median projection, marginal before 1/4, traversed 

 by two short streaks with truncate ends, one above cell, another in 

 fold; on costa this fascia extended by a short blackish marginal streak; 

 transverse fascia interrupted, blackish, with a rather large subquadrate 

 or semioval spot on middle of costa and a smaller conspicuous black, 

 obliquely oval spot beyond cell, with two digitoid smaller spots 

 between these posteriorly; costa beyond basal patch with eight pairs 

 of white marks, three anterior little oblique, eighth vertical; fourth to 

 eighth pairs connected below with a broad, almost horizontal leaden 

 fascia, curved downward before apex, streaked with whitish and with 

 pale ochreous ohve; costa posteriorly between white marks and apex, 

 black; an ill-defined very irregular fascia of little obscured ground 

 color running straight from above 1/3 of dorsum to well below 2/3 of 

 costa, thence wider, but parted by a blackish, very irregular line; 

 this line flanked by similar paler, lilac-leaden lines, to termen above 

 tornus; an irregular, dark fuscous mark beyond upper half of preceding 

 fascia, edging the leaden streak below, on some veins traversed by 

 tawny-olive longitudinal streaks, jutting out anterad, viz., along veins 

 5, 7 to 9; upper edge of termen with a narrow, blackish streak; dorsum 

 with five black, marginal streaks, separated by paler, above these 

 strongly clouded with dark grey and fuscous. 



Hindwing dark fuscous, with pale base and a darker subbasal 

 shade, cilia along dorsum pale ochreous. 



Male genitalia similar to those of Sycacantha escharota (Meyrick), 

 but with the top of tegumen and uncus represented by a strongly 

 separated, transversely elongated body, with uncus forming an apical 

 prominence on top of this. Socius moderate, clavate, pending, top 

 bristly; gnathos, a transverse horizontal band. Valva similar to 

 that in S. escharota. 



Material examined: Mindanao, Zamboanga del Sur, 24 km NW 

 of Milbuk near Lebak, 210-240 m, 8.VIII.1958, light trap (H.E. 



