90 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



about two-thirds as loni,' as the caudal horn. Those of the subdorsal series (///) are at base 

 broader in proportion than the dorsal ones and very sharp. Those of the infraspiracular series 

 (/'i'+ v) are well developed, sharp, though but one-half as long as those of the subdorsal series. 

 Caudal horn large (tig. ir), unevenly though decidedly forked at the end and bearing rounded 

 knobs or tubercles, some of which are quite long and slender. The horn is a little longer than the 

 thoracic dorsal horns and nearly three times as stout. 



On the ninth abdominal segment is a median tubeicle about twice as large as those next to it. 

 It is polished and silvery. 



Suranal plate (PI. LIV. tig. 7), triangular, not rounded as usual, thick and solid, especially 

 on the edges, with rounded knoblike reddish tubercles, four on each side, and more numerous 

 smaller ones on the under side of the edge. Across the base is a row of four small tubercles, 

 succeeded by a parallel I'ow of smaller tubercles. The end of the plate is forked, each division 

 formed by a large stout tubercle. 



Anal legs with cream-white porcellanous granulations or bosses around the thickened edges, 

 while the center is smooth. Spiracles green. The trunk segments are all smooth, without the 

 granulations present in A. hicolor and the San Antonio larva. Length about 40 nun. 



This larva is of remarkable interest, since there are quite high spines on the prothoracic seg- 

 ment, showing that this species is the most ancestral and primitive, nearer the stem form than 

 any other species of the genus whose larva is known. I had thought that Citheronla regidis, with 

 its long prothoracic spine, might be the stem form of the group, though the pupa is by no means 

 so primitive as that of the other genera. This South American larva, however, is apparently 

 the most ancestral of any of the Ceratocampinti? yet known, and indicates that eastern South 

 America was the center of origin of the family. It appears to be allied to the larva of ^1. hreris, 

 as figured by Peters (PI. Ill, fig. 5), in which there appears to be, judging bj- the poor figure, 

 short prothoracic spines, while the dorsal spine of the abdominal segments is represented as 

 being as long as the thoracic horns. Whether the undetermined Adelocephala figured by Peters 

 (PI. Ill, fig. 6), with very long, slender horns on all the segments, is a true Adelocephala seems 

 uncertain. 



The following species from Central and South America have not been examined by me: 



Adelocephala jason Boisd., 1. o., |i. s:i. 1S7L'. Mexico. 



Adelocephala falla.c BoiSD., 1. c, p. 84, I'l. Ill, fig. 3. 1872. Mexico. 



Adelocephala leucantha Boisd., 1. c, ]>. 89. 1872. Brazil. 



Adelocephala erubesceiis Boisd., 1. c, p. 91. 1872. Brazil. 



Adelocephala flavosignalii Walk., Cat. Lep. Het. Br. Mus., XXXII, p. .575. 1865. 



Adelocephala tristygma Boisd., 1. c, p. 86. PI. Ill, fig. 4. 1872. Brazil. 



Adclmrpluiln lenrostygma Boi.SD., 1. c, p. 85. 1872. Guatemala; Oaxaca, Mexico. 



Othoi' in ni'in S( iiAr.s, Amer. Lepiiluptera, I, p. 20, Tab. Ill, fig. 7. 1892. Rio Janeiro. 



Othoreu, ja,„,,,i Schavs, 1., c, p. 20, Tab. Ill, fig. 9. 1892. Rio Janeiro. 



Othorene inmlklaScHAVs, 1. c, p. 20. Tab. Ill, fig. 8. 1892. Rio Janeiro. 



Othorene Columbia Schaus, 1. c, )). 21. Tab. Ill, fig. 13. 1892. Colombia. 



Adelocephala acuta SciiArs, Journ. X. Y. Ent. Soc, IV, p. 59. Aroa, Venezuela. 



CKi:NrODES BKLL^VTRIX Stoll. 



Bomhtjx liiUntrir Stoll, Papillons exotiques, IV, taf. .305 F. 1781?. Sui>pl. Taf. XXII, p. 106, fig. 3. Larva. 



1791. 

 CcmO(7M 6rftori,c Herrich-Schaeffer, Aussereurop. Schmctt., I, \<. 11. 18.55. 

 Astiilishellatrix'Bo\i-<\., Annales .Soc. Ent. Belgique, XV, p. 94. 1872. 

 Crmodes hellatrix Kirby, Syn. Cat. Lep. Het., I, p. 616. 1892. 



In the absence of any material for examination I can only follow Boisduval in regarding 

 this moth as belonging to this sut)faniily. The moth, judging from StolTs figure, difiers from 

 Adelocephala. The species figured by him is apparently a female, with filiform antenna', .but 

 Boisduval states that those of the male are finely pectinated on the l)asal two-thirds. It does not 

 appear to belong with the Notodontidiv, where it was placed by Herrich-Schaefier and by Kirby. 



The larva, judging by Stoll's figure, appears to be allied to that of Adelocephala. The head 



