LARENriD.-E—OPORABIA. 377 



Larv« short aud thick, uot tapering ; feeding exposed. 

 Pur.B in the earth. 



We liave lint two species, both very variable, the fore wings 

 of 0. dihdutii l)eing broad and blunt and of a dull silky ap- 

 pearance, those of O.Jilii/rinniiniriii narrower, more pointed aud 

 far more glossy. When closely examined the antenna? of the 

 male 0. dilalafu, are seen to be furnished with minute 

 rounded knobs, one on each joint; while in 0. Jiliijiinninaria 

 these knobs are absent. This interesting distinction has been 

 pointed out by Mr. Louis B. Proiit. 



1. O. dilutata, ,SWm/.— Expanse l\ to 1| inch. Fore 

 wings ample ; silky, silvery greyish-white or pale grey-browu, 

 with three or more transverse, narrow, grey or grey-brown 

 bands, and numerous parallel lines. Hind wings white, edged 

 with grey lines. 



Antennas notched, thickly ciliated, pale grey-brown ; palpi 

 only just perceptible, dusky white; face convex, smoothed 

 downward, dark chocolate ; upper part of the head brownish- 

 white ; neck-ridge large, erect, and of the same colon r ; 

 thorax grey, or brownish-white, or darker, in accordance with 

 the colour of the fore wings ; abdomen small and short, 

 smooth, brownish-white ; tufts all small. Fore wings very 

 broad ; costa strongly and regularly arched ; apex bluntly 

 rounded ; hind margin gently curved, rather oblicpie ; dorsal 

 margin also rather filled out ; silky pale grey, or pale, or 

 darker, brownish-grey ; basal line very faint, angulated, grey ; 

 first line faintly double, angulated outwards, grey but often 

 emphasised hy black streaks on the nervures ; followed at a 

 short distance by a parallel similar pair of lines, very faint, 

 but Connected by the black streaks on the nervures ; second 

 line rather erect, grey, angulated at each nervure, curved 

 between them, and showing off black lines on the principal 

 ones, these black lines also crossing two fainter grey lines 

 parallel with tlie ordinary second ; hind-marginal region 



