190 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Larva. 



(PI. XXV, ligs. 1, \„. \h. Ir. ],l 1,.. 1/.) 



Di/ar, Eut. Amer., v, p. 91, 1S89, (full life history, eg^ to iimtln. 

 I'ackaril. Fifth Kep. V. S. Ent. Comm.. p. 1.57, 1890 (full-fed larva, pupa). 

 Proc. Best. Sof. Nat. Hist., xxiv, p. 541, 1890. 



Moth. — Two <5 , 1 9 . Piile cinereous. Pronotal scales discolored with ligneous brown. A 

 broad median thoracic dusky line, succeeded on the abdomen bj- a dark spot. Fore wings whitish 

 ash-gray, with brown scales arranged iii streaks; on the costa the streaks are directed obliquely 

 toward the outer margin, ending upon the subcostal vein. Toward the apex there are two distinct 

 brown streaks, which are parallel to the costa; between and below 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 i)as.ses 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 ocherons. ,Tust below tlie basal portion of the median vein i.s 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 

 trausver.se streaks or liue.s. Hind wings white, the costa slightly discolored with ashen scales. 

 Abdomen nearly concolorous, being a shade darker than the hind wings. Beneath, of an ashen 

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



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



Edwards's Janassa colorudcnsis is a pale silver white variety of his Schizura 2K>'(tii!)ul(itu,an I 

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



J^g<j. — "Globular and smooth" (Dyar). (For a more complete description, see Appendix A.l 



This cateri)illar has been already well described in all its five stages, by Mr. H. O. Dyar, in 

 Entomologica Americana (v. p. 91, May, 1SS9). The points of special interest, noticed by Mr. Dyar 

 are (1) that only five eggs in the case observed were deposited on the same plant ; (2) the larvre feed 

 singly and during Stages I and 11 they "eat only the ui)per portion of the leaf, and their yellowish- 

 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 compared with the last stage, Mr. 

 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, di.stinct, with long glandular hairs. 



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

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

 This is in accordance with what appears to be the rule in this group, i. e., that when the larvtB 

 reach Stage III they feed more conspicuously and then begin to ari.se the special protective shape 

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



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

 kindly loaned me by Professor Riley and collected by Mr. Bruner in Nebraska, may be of interest. 



Sccoiid st(ujc. — Length, G-7 mm. Head large, deeply 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, bnt those of the prothoracic pair are considerably larger than the meso- 

 thoracic, and the latter are larger than the metathoracic pair. The tubercles on the first abdominal 

 segment are a little larger than those on the prothoracic segment. Those on the eighth abdominal 

 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 setie arising from the dorsal and lateral tubercles are decidedly 

 clavate at the end. 



Compared with Schiziira Ipomea' of the same stage and size, the head of Janassa is seen to 

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

 abdominal segments are nearly the same, bnt the paddle-shaped seta' are shorter, while the body, 

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



