\\ liilf ill Ari(hi/i(i till' origin ol' liic .scroiul subcosliil is ii.sua.Uy very rciiintu 

 tVoni llie iirst subcostal; the median venules are shorter than in Acidalia. 

 Le<>:s very loni;- and slender; hinder pair slender, the tibia' not swollen, iinl 

 long and slender, with two pairs ol' large, long spines ; tarsi two-thirds as long 

 as the tibia'. >Male aixlonien very long and slender, ('oloration: wings thin, 

 glossy gray, with pale-yellow isii costal s|)ols, with two innch-cni'ved, sinuate, 

 faint lines. 



Tiiis genus is remarkable for the extremely hnig pal|)i, while the i{)re 

 wings are mucli arched on the cosla, and the angle ol" the hind wings is large 

 and prominent. The venation diti'ers chielly from Acidcdla in there Ix'ing two 

 subcostal cells. 



Cer.'Vtodalia gueneata, Kp. nor. IMafe 10, (ig. 40. 



8 c^ . — Body and wings ash-gray, with a silky luster. Head i)rown in 

 front ; orl)its much paler. Fore wings with eight or nine pale-ochreous, 

 irregular, costal s[)ots, with about si.\ indistinct lines, which are paralh'l and 

 bent outward below the costal region nearly at right angles; the limr inner 

 lines arc dark and indistinct ; the fifth line is a continuation uf oik; of the 

 yellow' costal spots; just below the costa, it is curved inward, and then makes 

 a rectangular bend outward, and thence goes obliquely to the outer third of 

 the inner edge, curving in a little on or just below the third median v(!in ; a 

 sul)marginal scalloped light line; a tine Idaekish marginal line on both wings; 

 fringe pale gray, spotted with blackish. Hind wings with two much-curved 

 pale shades, the cuter bent at right angles and parallel with the outer edge 

 of the wing. Beneath, highly colored ; basal two-thirds of wing (hirk lirown, 

 mottled with light dots near the costa; a dark discal linear dot; half-way 

 between the dot and the outer edge of the dark-l)row n area a dusky line, 

 bent at right angles opposite the dot. The iirown area is limited by a repro- 

 duction, very distinct, of the whitish line, which makes an acute rectangular 

 bend opposite the discal dot, the angle being situated half-way iietween the 

 discal dot and the apex of the wing. Beyond this line, the wing is much 

 lighter, mottled with white, with deep-ochrcous slashes, the veins deep 

 ochreous, and the fringe as above. Hind wings with the same markings as 

 above. Legs brown, ringed and spotted with whitish. 



Length of body, S, 0.4.'3 ; of lore wing, 9, 01)'); expanse of wings, 

 1.05 inches. 



