MEMOIRS OF THE jSATIONAL ACxlDEMY OF SU1E2:CES. 255 



Underside uniformly pale, body and both wings almost white, and in some examples crossed 

 by a dusky line. 



Exi)anse of wings, 3 48 nun., 9 43 mm. ; length of body, S 1!) mm., 9 18 mm. 



In the stvaiglit costa, ratlier oblique outer edge, and lack of any definite markings, including 

 a discal nuirk, this species, with its pale, faded look, differs from any others of the genus. 



Specimens of the extremes of variation iu a brood reared by Professor Popenoe, and which, 

 he sent me, included both unicolor and marina of my Synopsis. 



J^!/!/. — Diameter, about <».7 mui. Kegularly hemispherical, though rather flat, not being more 

 than half as high as broad. Shell, when empty, thin, white, ornamented with dense, more or less 

 regular, welldetined polygonal areas, the edges or margins of which are very finely beaded ; toward 

 thea))ex they become more or less elongated and the micropyle at the apex is surrounded by a double 

 rosette of elongated oval areas, the sharper end pointing inward, those of the inner row oue-tiiird 

 to one half as large as those forming the outer series. The larva in escaping eats, as usual, an 

 irregular, kidney-shaped bole near the top. 



The eggs were received from Mr. Tallant of Columbus, Ohio, August 21, having been sent on 

 the ISth, all hatching on the way. 



Larva, Stage I. — Freshly hatched larva. Length, including the tails (stemapoda), 6-7 mm. The 

 head is almost as wide as the body, somewhat heart-shaped, bilobed, dark chestnut, paler along 

 the middle. The body is long and slender, especially elongated behind the eighth abdominal 

 segment. The prothoracic segment in all the examples is full, as if it were about to molt, though 

 it seems too soon after hatching. The prothoracic segment bears two diverging, ratlier thick 

 appendages, which are cylindrical and rounded at tip ; the segment at base and behind pale reddish 

 and cherry-red above; the appendages are cherry-red at base, paler above, but toward the end 

 on the distal two-thirds blackish. In front are two reddish iiarallel stripes. The body is pale 

 beneath, above pale greenish yellow, the third and seventh abdominal segments cherry-red, 

 including the sides, low down, of the sixth segment. From the first thoracic to the end of the 

 body are three parallel lateral, linear, reddish lines, the lowermost being obsolete posteriorly. 

 The eighth abdominal segment is convex above, but not humped. The suranal plate is small, 

 narrow, but distinct, rough on the surface and dark, almost blackish. Behind, at the base of the 

 tails, are two piliferous warts; the tails themselves are as long as the three last segments (8-10) 

 taken to together, and are of uniform thickness, ringed with dark red, densely, microscopically, 

 spinulose, with sparse line hairs and with two or three hairs at the end. The legs each end in a 

 cylindrical swollen flagellum, somewhat barrel-shaped, with a deep red ring in the middle, the end 

 being clear and transparent. All over the body the piliferous warts and hairs are minute. The 

 glandular setre are short, slender, widening at the square end, and not being regularly bulbous. 



It rests With the body curved around so that the head nearly touches the tails, the last three 

 segments and tails being held u[) in the air, the latter being extended and then gracefully thrown 

 into the air. 



Stage II. — Length, 9 mm. The anal legs are still longer than before, but the prothoracic 

 spines are much less than one-half shorter than before, while the back of the body is now 

 reddish. (Popenoe). 



Dr. Dyar has contributed the following descriptions as the proofs are passing tln-ough my 

 hands : 



Stage III. — " Head whitish green, a broad difl'use brown band on each lobe to vertex; width, 

 1.35 mm. Cervical horns represented by two short black tubercles; tails 2 mm. long, faintly 

 reddish, the crimson tips a little swollen. Body green, with three to five faint white lines each 

 side of the reddish brown dorsal band, which is distinct, covering cervical shield and anal jdate, 

 retracted at each suture and widening on joints 7 and 11. 



Stage lY. — "Head about as high as wide, narrowing toward the vertex; width, 2.2 mm., 

 ?narked as before, the inner white border of the brown band very broad, covering a large part of 

 the face. Cervical horns reduced to mere points. Dorsal band as before, but of nearly uniform 

 width, though widened on joint 11. The baud is mottled with and bordered by white, becoming- 

 yellow in the segmental sutures. There is a trace of a yellow stiginatal line, and the sides have a^ 

 few black specks toward the extremities." 



