170 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xn, 



The tubercles of the supraspiracular row are minute, yellowish, and not quite twice as long 

 as thick. 



In the few reared by Mr. Joutel the larvae were all alike, no matter what their color was in 

 the previous stages. 



Stage V, and last: Unfortunately my single larva died before assuming its final stage of 

 growth, and I shall have to depend on Mr. Joutel's drawing for the following description. Up 

 to this stage the caterpillar was in all its stages a remarkably striking and exquisitely beautiful 

 one, especially in stages III and IV, where the tubercles were of such a soft and delicate turquoise- 

 blue, contrasting so markedly with the yellow or green hues of the body. 



Length, when at rest, head down, 63 mm.; when extended in the act of walking, 78 mm. 

 The body is now thick and fleshy, destitute of tubercles with the exception of the two rnedio- 

 dorsal ones on the third thoracic segment, and the medio-dorsal one on the eighth abdominal 

 segment, otherwise the body is entirely unarmed, with apparently no traces of the tubercles 

 present in the previous stages. The tubercles on the third thoracic segments are (united into 

 one), stout conical, nearly twice as high as thick at the base, and with a conspicuous dark spot 

 in front. When at rest, head down, this horn projects up in a very conspicuous way. The 

 posterior tubercle (medio-dorsal) is small, low, button-like, not conspicuous; on neither of the 

 tubercles are there any setae. 



The body is now greenish yellow, with the sutures bathed with yellow. The lateral ridge 

 is also yellowish, and along this ridge is a series of small blackish spots, one to each thoracic and 

 abdominal segment, there being one on the side of the suranal plate. The head, all the legs, 

 both thoracic and abdominal legs, and the under side of the body are pea-green. 



Such differences between the last and the preceding stages as are seen in this caterpillar 

 are very unusual. It is evident that the tubercles and bristles were undergoing reduction in 

 the fourth stage, but one was hardly prepared for the loss, without apparent vestiges, in the last 

 ecdysis, of all except the dorsal ones on two of the segments. The cause, if it could ever be 

 explained, would be most interesting. 



This case reminds us of a member of the same family, Rothschildia betis, but in that form 

 all the tubercles are atrophied, and the change from the penultimate to the last is otherwise 

 probably slight. A more striking resemblance is that to the larva of Cercophana frauenfeldi of 

 Chili, of which there is a colored drawing in the British Museum. In this case the third thoracic 

 segment is prolonged into a long curved fleshy horn which projects over the head when the latter 

 is retracted. It has no tubercles, and a yellowish stripe extends from the tip of the horn along 

 the side of the body to the end of the acutely prolonged suranal plate. 



Its resemblance to the last fourth stage of Aglia tau should also be noticed, though the latter 

 at its final molt discards every trace of the armature of its earlier stages. This larva has what 

 Poulton believes to be a terrifying spot on the side of the first abdominal segment. The question 

 arises whether the spot on the front of the thoracic tubercles of Rhodiafugax is of this psychologi- 

 cal nature, and also whether the dark patch on the front of the body under the horn of Cerco- 

 pTiana is deterrent to other animals. All three of these larvae have a conspicuous yellowish or 

 (on Aglia) reddish lateral stripe. 



Sound produced by the larva. — Mr. Joutel informs me that this larva in its last stage ' ' makes 

 a squeaking noise by moving its head up and down on the prothorax." 



RHODIA NEWARA Moore. [RHODINIA NEWARA]. 



PlateaXXX, fig. 3; XL, fig. 1; CII, fig. e. 



RHODIA JANKOWSKH (Oberth.). [RHODINIA JANKOWSKH]. 



One 6* (Paris Museum). A remarkable form, with clear ochreous yellow [subcircular, 

 somewhat reniform] spaces on fore and hind wings; bands nearly obsolete. 



[PARARHODIA n. n.] 



[Eurhodia Rothschild 1905; nom praeocc. (D'Arch. Haime, 1853). New Guinea]. 



[Type, Pararhodia gyra (Eurhodia gyra Roths.) - also includes P. meeki (Eurhodia meeti Jordan, 1908).] 



