88 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Expanse of the fore wings, S 5^ mm.; length of one fore wing, S 27 nnu.; breadth of one 

 fore wing, S 12 mm.; length of one hind wing, S IS nnn.; breadth of one hind wing, $ 13mm. 

 This is a verj- peculiar and well-marked species of the size of A. ward!!. 

 Herrich-Schacti'er states that his dimidiata is a synonj'm of Walker's species. 

 Oeograjjhlcal range. — Brazil (Neumoegen Coll. Brooklyn Museum); (Britisii Museum). 



^^lEELOCEFH^L^ BREA'IS ^Valker. 



Adelocephala brevis Walker, Cat. Lep. Het. Br. Mus,, VI, p. 1500. 1855. — BoisnrvAL, Annales Soc. Ent. Bel- 



giqiie, XV, p. 89. 1872,— Peters, Die Heteroceren-Raupen, p. 10. (1898)-1901. 

 fitissj>hin.( brevis Dyar, Proc. Ent. Soc. Washington, IV, p. 429. May 13, 1901. 



Larra. 



Peters, Die Heteroceren-Eaupen, Tab. Ill, fig. 5. (1898)-1901. 



Imago. — 1 9 • A distinct species allied to ^1. hicolor, but the apex of the fore wing is a little 

 more acute than in 9 of that species. Ground color uniform light gray, of the hue of a pale, 

 dead leaf with scalloped strig-te; the shade is peculiar and unlike that of any other species. A 

 distinct dark extradiscal line extending from within the middle of the inner edge of the wing to 

 the costa just before the apex; an obscure oblicjue basal line. 



Hind wings with a single line extending across the middle; no discal .spot beneath. 



Expanse of fore wings, 9 68 ram. ; length of one fore wing, 9 35 mm. ; breadth of one fore 

 wing, 9 16 mm.; length of one hind wing, 9 -1 mm.; breadth of one hind wing, 9 lo mm. 



Geographical range. — Brazil (Neumosgen Coll. Brooklj'n Museum); Rio de Janeiro. The 

 specimen in the Neuma'gen collection does not exactl}' agree with the descriptions of Walker 

 and Boisduval, and further comparisons are necessary. 



Larra. — Boisduval .states that the caterpillar is ^yellowish green with the spines of a brilliant 

 golden hue, of medium length, curyed backward and directed backward; the horns on the second 

 and third thorai'ic segments toothed, as is also the caudal horn. The tirst thoracic segment 

 (collerette) has no .spines, these being replaced by small conical tubercles. 



Peters states that the larya is yery similar to that of ^4. suharujiduta and lives on the same 

 climbing, prickly plant; also on a spiny Mimo.sa. 



A.r>F:LOC'EPTIA.LA VIIOCA.TA. Boi^^cluval. 



Adelocephala crocaUi Boisduval, Annales Soc. Ent. Belgique, XV, p. 90. 1872. — Kirby, Syn. Cat. Lep. Het., I, 



p. 741. 1892. 

 Adelocephala argyraeaniha Boisduval, 1. c, XV, p. 90. 1872. — Var. Kirby, 1. c. p. 741. 1892. 

 Syssphhix argi/racantha Dyar, Proc. Ent. Soc. Wash., IV. p. 429. May IS, 1901. 



Imago. — J. S ■ "One of the .smallest species; its fore wings are of a tawny j'ellow, as also 

 the tiiorax and abdomen; the fore wings are obliquely crossed from the apex to the middle of 

 the inner margin by a very narrow brown line; a basal sinuous ol)Scure line; a white discal dot; 

 outer edge of the wing loathed with rosy gray; hind wings unspotted, with the fringe paler; wings 

 beneath yellowish, with an oblique brown line; the discal region of the fore wings yellow, with 

 a darker central dot." (lioisduval.) 



In the Neumoegen collection of the Museum of the Brookh'n Institute is a male from Brazil. 

 It is a small species. The body and wings are ocherous. It diti'ers from^l. argyravar)tha in hay- 

 ing on the fore wings a small white discal spot; the extradiscal line fades out before reaching the 

 inner edge, while in A. argyracantha it distinctly ends on the inner angle of the wing, curving 

 around to it, and the discal dot is not white, but deep ocherous brown. The fore wings on their 

 under side afe ocherous, with a pinkish wash toward the apex, and the ])ody and hind wings are 

 whitish ocherous, almost chalky white. 



Expanse of fore wings, $ -42 mm.; length of one fore wing, $ 21 nun.; breadth of one fore 

 wing, S 9.5 mm.; length of one hind wing, S 15 mm.; breadth of one hind wing, S 11 mm. 



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