18 U.S. NATIONAL MUSEUM BULLETIN 25 7 



Ilomona bicornis, new species 



Figures 33, 39-40, 495-496 



Male, 15-17 mm. Head and thorax pale taAATiy ochreous, thorax 

 slightly mixed A\itli brownish or evenly greyish suffused. Palpus 

 pale tawny ochreous. Antenna finely brown-ringed posteriorly. 

 Abdomen whitish ochreous. 



Forew'ing elongate, subtruncate, with a very strong costal fold, al- 

 most covering more than the half of ^^ing breadth, costa gently 

 sinuate, apex rectangidar, termen gently sinuate, prominent below. 

 Pale ochreous, suffused with somewhat opalescent lilac white, glossy 

 in certain lights. Markings light tawny slightly mixed with pale 

 lilac and A\ith dark bro\Mi. Costal fold sometimes ta\\Tiy, with a 

 few brownish transverse lines; basal patch mdicated by dark bro^^^l 

 ill-defined suffusion extending from beyond base to about 1/4 of wing, 

 sometimes absent or limited; transverse fascia formed by a moderate 

 transversely semioval lilac grey spot on 2/5 of costa, edged with 

 blackish browTi, and by a more oblique rather narrow yello-wish- 

 ochreous fascia from below preceding, running to 2/3 of dorsima, 

 its lower part vertical, its anterior edge well defined throughout, 

 and sometimes pale edged, posterior edge ill defined and obscured 

 by greyish suffusion extending to tornus; costal patch elongate and 

 rather narrow, extending along posterior third of costa to apex, lower 

 edge notched before its middle. A series of short vertical dark brown 

 lines before apex, termen, and in tornus. Cilia glossy pale ochreous. 



Hindwing rather dark greyish fuscous, sometimes costal half 

 golden ochreous, sometimes wing more or less semipellucent. 



Male genitalia resembling those of Homona wetan Diakonoff . Uncus 

 with an invert-triangular, truncate top. Socius parietal (in wetan 

 free). Gnathos with a much longer hook. Transtilla rather similar, a 

 flat band with inbent margin. Valva sub triangular, higher than long, 

 much shorter than in Homona co^earia. Sacculus 1/2, top strongly 

 dilated and roimded, upper edge irregularly serrate, ending in a short 

 vertical thorn. Aedeagus very characteristic, broad and pistol- 

 shaped, top truncate, an oblique median oval thickening on the right 

 side, dorsolaterally, ends produced in two long horns, directed for- 

 ward, upper straight, lower longer, top slightly pointing downward, 

 or straight. Cornuti, a sheaf of sinuate blades, with a slender and 

 slightly bent, pointed top. Caulis long and ciu-ved. 



Female 20-25 mm. Head, palpus, and thorax pale ochreous mixed 

 mth tawny. Abdomen pale orange. Forewing elongate-trimcate, 

 somewhat variable as to the shape, broader or narrower, with apex 

 more or less produced. Pale tawny ochreous scattered with fine 

 transverse dark browTi strigulae. Basal patch indicated by some 



