MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 89 



Geogniphival /•-/«(/<'.— Brazil (BoiMlu\:il, Neuuicegen). 



Var. Adelocephala an/iiniriiiillin Boisduval, Annales Sbc. Ent. Belgique, XV, p. 90. 1872. 

 Burmei^ter, 1. c, PI. XXIII, iig. 7. 1879. 



Larva. 



V\. XLIX, fig. 1. 



Boisditial, Annales Soc. Eut. Belgique, XV, p. 91. 1872. 



Burmeisler, Atlas de Deser. Phys. Rep. Argentine, p. 52. PI. XXIII, Iig. 7. 1879. 



Imago. — 1 S . In this form, regarded by Kirby as a variety of ^1. crocafa, and which appears 

 to be .so from an examination of the Neumtegen collection, both wings and also the body are 

 ocherous. while the fore wings are more pink toward the apex. 



Expanse of the fore wings, S 40 mm. ; length of one fore wing, S 19 mm. ; breadth of one 

 fore wing, S S mm.: length of one hind wing, S 13 mm.; breadth of one hind wing, S 9 mm. 



Larva. — Resembles that of hrevis. Green or yellowish green, with the spines shining like 

 polished silver, curved backward and pointing backward, of nearly equal length, those of the 

 second and third segments toothed, as also the caudal horn, which looks like a recurved tail. The 

 front edge of the prothoracic segment (collerette) is garnished with quite prominent silvered 

 spines. (Boisduval.) 



We copv (PI. XLIX, tig. 1) from Burmeister his figure of the larva of ^1. argyracantha. He 

 .states that the prothoracic spines are reduced to small hemispherical tubercles; the dorsal spines 

 of the two hinder thoracic segments, with the caudal horn, are very large and have the angles 

 toothed before and liehind; all the spines are bilateral and distinctly compressed. In the living 

 caterpillar the spines and tuljercles are magnificently silvered on the outer side, but roseate on 

 the inner side. 



The pupa lies in the earth in a cavity lined with silken threads. 



Food plant. — In Buenos Ayres the larva feeds on Gleditschia tricanthos. 



Geographical range. — Boisduval states that this and anthoniUs are the two species most fre- 

 quently met with in the vicinity of Novo Friburgo, though the moths' themselves are rarely seen. 



On the label of the specimen in the Neumoegen collection Paragtiay is given as the locality. 

 Burmeister records it from Buenos Ayres. 



AdelocephaJa larva not determived (PI. 111. rig. 1). — The following description is drawn 

 up from a dry and contracted caterpillar from Brazil, obtained through M. Donckier: It is 

 a form of remarkable interest, since it appears to be more primitive in its characters than any 

 other species yet known. This is seen in the unusual development of the prothoracic spines and 

 in the equality in the size and unusual length of the dor.sal spines of abdominal segments 1-7. 



Head (PI. XLIV. fig. 13) conical, much niore so and also higher than in ,1. /.sv'a.y, and 

 still more so than in A. Incolor. It is of a rich olive sea green, with a broad whitish band arising 

 from just in front of the ocelli, ending on the vertex, and edged behind with a dark-green 

 parallel line. 



Prothoracic segment with high dor.sal (/) and subdorsal {jii) spines, polished, silvery white 

 or porcellanous, erect, nearly smooth, with minute low spinules, and nearly as long as the horns 

 behind are thick. Two dorsal (/) and two subdorsal (///) spines or horns on each of the two fol- 

 lowing thoracic segments, which are about as long as the head is high or as the bodj'is thick, and 

 smooth in front; they are smooth in front, but behind bear, besides a few minute ones, four or 

 five large rounded spinules about twice as long as thick in the middle. The distal third of each 

 horn is smooth. The horns are sharp and decidedly recurved; the subdorsal ones (//<) are but 

 slightl_y shorter than those of the dorsal series; those below (/v + v and vii) are mere short 

 tubercles. 



On abdominal segments 1 to 7 the dorsal spines (/) are saber-shaped, compressed, recurved, 

 and very long, but little shorter than the subdorsal horns and about two-thirds as long as the 

 caudal horn. They are polished, glistening, and in life wei'e probably porcelain or silvery white. 

 All of the series are of the same length and but little shorter than the subdorsal horns {Hi) and 



