16 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



DYSDXMONIA ARISTOR (Felder). 



Aricia aristor Felder, Reise d. Novara, Lep., IV, Tab. 91, fig. 3, 9 , 1874. 

 Dysdsemonia aristor Kirby, Syn. Cat. Lep. Het., I, p. 768, 1892. 



[Geographical distrib ution. — Surinam.] 

 [Rothschild makes this a synonym of D. boreas.] 



DYSD-dEMONIA PLUTO (Westwood). 



Saturnia ? pluto Westwood, Ann. & Mag. Nat. Hist., ser. 2, XV, p. 301, 1S55; Proc. Zool. Soc. London, 1853, p. 164. 

 Dysdxmonia ? pluto Walker, Cat. Lep. Het. Br. Mus., VI, p. 1330, 1855. 



Walker states: ''This may be a variety of D. glaucescens." 



Geographical distribution. — Venezuela (Walker, British Museum). [Brazil, Rothschild.] 



[Rothschild (1907) has described a subsp. andensis from Peru.] 



[Other species of Dysdxmonia are D. platydesmia Rothschild, 1907 (Peru), with subsp. 

 castanea Roth., 1907 (Costa Rica); the latter figured in Nov. Zool. 190S, PI. XI, f. 10; and 

 D. lemoidti Schaus, 1905 (French Guiana).] 



AGLSA Ochsenheimer. 



Plate LXXXIV, fig. 4: CIII. 



Aglia Ochsenheimer, Schraett. Eur., Ill, p. 11, 1810. 



Echidna Hubner, Tentamen, p. 1, 1S10? 



Aglia Hubner, Verzeichniss bekant. Schmett., p. 152, ISIS or 1822. 



Aglia, Walker, Cat. Lep. Het. Br. Mus., VI, p. 1313, 1S55. 



Aglia, Kirby, Syn. Cat. Lep. Het., I, p. 783, 1892. 



Imago. — <3 and 9 . Head not prominent, in 9 much less than in <? ; front moderately 

 wide, of much the same proportions as in Arsenura and Dysdxmonia. The sides between the 

 eyes parallel, not converging toward the labral region; the hairs standing straight out, long 

 and fairly even; when denuded the front or clypeus is but a little longer than wide, nearly 

 square. The eyes are rather small. 



Antenna? of <? consisting of 40 joints, 39 of which bear each two pairs of pectinations, 

 which extend to the penultimate joint, very widely and evenly branched so that they are 

 between one-half and one-third as wide as long; the distal branches are very slender, pressed 

 against the basal ones of the succeeding joint, and a little shorter than the basal ones, ah the 

 branches with long sparse cilia. In 9 the basal branches reduced to minute stout teeth; no 

 vestiges of the distal ones. 



Palpi large, unusually well developed, ascending and passing well beyond the front, farther 

 than usual, except in Arsenura and Dysdxmonia; the third joint large, well developed, and 

 unusually distinct; when denuded, the second joint is seen to be much longer, nearly twice, 

 than the basal joint. The maxillre with no vestiges iinless two microscopic tubercles represent 

 them, at all events they are still more vestigial than in Arsenura. 



Wings of both sexes very similar in shape, though the 9 hind wings are perhaps a little 

 more produced toward the apex; fore wings moderately wide, costa straight, arched toward 

 the subacute apex; slightly subfalcate; outer edge very slightly excavated. Hind wings in 

 each sex reaching well beyond the end of the abdomen; they are rounded at the apex, outer 

 edge full and well rounded, the inner angle rounded. 



Venation: Vein 11^ arising close to the common stalk of veins III 3 and III,, and both 

 points of origin situated just within that of the anterior discal vein, which is oblique, thick, 

 and throws off the independent (vein IV 2 ), near the middle of the extradiscal cell, but not 

 exactly in the middle, as occurs in Arsenura and Dysdxmonia. The rest of the discal vein 

 (posterior one) is divided into two curved separate veins, giving off a slight short fold (or 

 incipient vein) passing outward. No vein III 2 . Hind wings with an arrangement of veins 

 approaching that of Arsenura and Dysdxmonia, though cjuite distinct. It agrees in the discal 

 veins, together forming an oblique line, so that the general shape of the discal cell is the same, 

 the outer side being very oblique; in Aglia vein IV, is not quite so near the middle of the 



