Palpi short, uol cxiendiiig far boyoiul tlic head; the second joint wide; third 

 short, conical, and usually nuM'sfcd in with the second joint, not free as in 

 Pdropliora. Fore wings slightly sublalcate, with the eosta regularly arched, 

 the apex acute, and the outer edge very o!)li([iii': or the wing is shorter, 

 scarcely sublalcate, and the apex ol)tus(\ The iiind w ings are short, liill, and 

 either sha[)cd as in Pdropliora or slii,dilly angled ; on the outer edge, some- 

 times the angle is well marked. The wings project well beyond the end oi' 

 the alxlomen, which is short and thick; much shorter than m Pdropliora, 

 with similar, but less marked, dorsal and lateral tut'ts, and with an obtuse 

 anal tuft. The venation differs from that of I'etrophora in the first subcostal 

 venule being longer, while the second and third are shorter. The discal 

 venules are always perfect ; the anterior one being straight or oblique, and the 

 posterior one oblique and usually much bent. There are usually two sub- 

 costal cells, either very unequal (O. fcrrugata, pi. 1, lig. 8), or large and suij- 

 (■(jiial, as in the closely-related species O. dexignuta (tig. 8fl) ; or, as in O. llgni- 

 colorata (fig. 8/*), there is l)ut one small cell, and the first costal arises some 

 distance from it. Hind tarsi a litth; shorter than the tibiae. Coloration: 

 usually with many zigzag lines on the I'ore wings, arranged sometimes in a 

 broad, dark, conspicuous, median band, and toothed prominently e.vternally ; 

 numerous fine, scalloped, more or less di.^inct, lines on the hind wings. 



This genus differs from Pdrophora by the shorter palpi, the pectinated 

 antenna;, or, when ciliated, by the dense cilia, and l)y the short, thick male 

 abdomen not extending as far as the inner angle of the wing, which is some- 

 times distinctly angled. 



There is a good deal of variation in the generic characters given above 

 in tlu' different species, particularly in the condition of the palpi and antenna;, 

 as well as in the venation ; but there is much similarity in the markings, and, 

 as a whole, the genus is tolerably easy to distinguish, certainly as much so as 

 some of the genera in other subfamilies; as, for example, the Ac idalince or 

 Gconietrince. 



Larva. — "Caterpillar elongated, attenuate anteriorly, cylindrical, marked 

 with l)lack points in the incisions; head small and globular; living on low 

 plants. I'upa subterranean." — Guenee. 



