190 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Larva. 

 (PI. XXV, li-s. 1, 1,1. 1/.. \i: \(l. ],: ]/.) 



Di/ar, Ent. Aincr., v, p. 91, 1889, (lull life liiatory, egi; to moth). 

 I'ackanl. KU'th I\i!i>. I'. S. Eul. Comiu., p. l.")7, ISH) (liill-fi-il l;nv;i. juipa). 

 Pioc. Host. Soc. Nat. Hist., xxiv, p. 511, 1890. 



Moth. — Two (5,19. Pule ciuercou.s. Pronotiil scales di.scolored with ligiieoii.s brown. A 

 broatl luuiliiiu thoracic dusky line, succeeded on the abdomen by a dark spot. Fore wings whitish 

 ash-gray, with brown scales arranged iu streaks; on the costa the streaks are directed obliiiuely 

 toward the outer margin, ending u]>ou the subcostal vein. Toward the apex there are two distinct 

 brown streaks, which are parallel to the costa; between and beh)w the second streak there are two 

 whitish streaks. A dark brown discal dot is situated upon the lower discal venule; beyond it is 

 a brown streak; in the middle of the discal space is a light line which passes over the discal dot 

 and continues along the lowest subcostal space to near the outer margin. Below the median vein 

 the wing is slightly tinged with ocherous. Just below the basal itDrtion of tlie median vein is a 

 brown streak, and the internal border is mottled and streaked with dark cinereous. The tuft is 

 dark brown'. The outer edge of the wing is also darker than the discal portion. There are no 

 transverse streaks or lines. Hind wings white, tiie costa slightly discolored with ashen scales. 

 Abdomen nearly concolorous, being a shade darker than the hind wings. Ueneatii, of an asheu 

 hue, with a distinct median black line. Tarsi broadly ringed with dark scales. 



Expanse of wings, 9 , 57 mm.; length of body, 9 , 23 nun. 



Edwards's Janatma color adcns is is a pale silver white variety of his {^vliizuru perau(iul<ttu,&?, I 

 find by a comparison with his type in the American Museum of Natural History. 



E(j(j. — "Globular and smooth" (Dyar). (For a more complete description, see Appendix A.) 



This caterpillar has been already well described in all its five stages, by Mr. H. G. Dj'ar, in 

 Entomologica Americana (v. p. 91, May, 1S89). The points of special interest, noticed by Mr, Dyar 

 are (1) that only live eggs in the case observed were de])0siteil on the same plant; (2) the larvse feed 

 singly and during Stages I and II they "eat only the upper portion of the leaf, and their j'ellowish- 

 brown color well simulates its withered appearance; (3) subsequently they devour the entire leaf, 

 with the exception of the largest veins and rest on its edge, where they might be mistaken for a 

 curled and discolored portion." 



Of the structural features and shape of the first stage, as compnrcd with the last stage, ^Ir. 

 Dyar gives no detailed account, except referring to a "hump on joint 5," i. e., the first abdominal 

 segment. He now informs me that the tubercles are flat, distinct, with long glandular hairs. 



In the second stage the head is said to be "slightly notched on top." In Stage III the 

 imi)ortant observation is made that "the markings of the mature larva now begin to be assumed." 

 This is in accordance with what a|)i)ears to be the rule in this group, i. e., tluit when the iarviii 

 reach Stage III they feed more conspicuously and then begin to arise tlie special ])rotective shape 

 and colors of the last stage ami also the terrifying movable warts or sjiines, if present at all. 



As regards the second stage of this larva, the following notes on some alcoholic siiecimens, 

 kindly loaned me by Professor lliley and collected by Jlr. I.runer in Nebraska, may be of interest. 



Second utiiijc. — Length. 0-7 mm. Ileatl large, deci)ly indented on the vertex, each lobe bearing 

 near the end a piliferous wart. The two dorsal piliferous tubercles on each thoracic segment are 

 nearly of the same size, but those of the prothoracit; jniir are considerably larger than the meso- 

 thoracic, and the latter are larger than the metathoracit; ])air. The tubercles on the iirst abdominal 

 segment are a little larger than those on the prothoracic segnu'iit. Tiiose on tiie eighth abtlominal 

 segment are as large at the base, but not so high as those on the first abdominal segment; and 

 those on the ninth segment are quite large, being about two-thirds as large as those on the 

 eighth abdominal segment. All the seta- arising from the dorsal an<l lateral tubercles are decidedly 

 clavate at the end. 



Compared with Schiznra ipoiiiea' of the same stage and size, tlie head of Janassa is seen to 

 be larger and the lobes above more pointed. The shape and jiroportions of the thoracic and 

 abdominal segments are nearly the same, but the i)addl(' slmped seta' are shorter, while the body,, 

 generally, is stouter. At this stage the two larvse appear to be scarcely generically distinct. 



