MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 231 



This is a very variable specios, and it is difliciilt to separate some cabinet specimens, wlien 

 not fresh, from those of H hiundata. It is distiniiuislicd by the stouter i)alpi, the second .joint 

 being broad and busliy at the end, while the third joint is shorter than in binndata; tlie second 

 joint is either ashen or with a narrow blackish line on the outside, while in hiundata the side is 

 almost wholly black, and the third joint is much longer. It is best charactei'ized, however, by the 

 usually not very distinct, linear, curved discal nmrk being inclosed in a large, diffuse, lunate, pale 

 ashen patch. lu the well-preserved and fresh and rather melanotic Franconia specimens received 

 from Mrs. Slosson this spot is small and obliquely oval. It also differs from hiundata in the less 

 distinct transverse lines of the fore wings. Eubbed and worn specimens are never so uiiiforinly 

 olive-green as in hiundata, and have never been oi>served becoming ocaerous yellowish or reddish, 

 as occasionally occurs in hiundat<i. ^lany individuals are smaller than in hiundata. 



The specinu^ns collected by ^Irs. Slosson at Francouia, N. IT., and they are very fresh and 

 well preserved, are decidedly darker than those fi'om the Southern States and from near the coast, 

 while the lines and discal mark are rather more distinct. In the Franconia examples there is a 

 diffuse whitish patch extending from the middle of the wing beyond the extradiscal line to the 

 apex, including the two dark subapical spots or streaks. 



In a 2 example reared from the larva figured (m PL XXXIII, fig. 2, 2a, the cross lines on the 

 fore wings are obsolete and the wings are very pale whitish, with a slight olive tint, and the outer 

 half of the wings are whitish, while both wings beneath are very pale ashen in hue. The shape 

 of the wings is much the same in both species; in guttivittu, however, the costa of tlic fore wings 

 is a little more full, the wings being a little more produced toward the ai)ex. 



For my identification of this species I depend on a fairly well-preserved large 9 from Brooklyn, 

 N. Y., which, in 1SS9, I compared with and wlrich well agreed with Walker's type in the British 

 Museum. Mr. R. Thaxter also regards this as the giittiritta of \Valker's description. It is Loch- 

 mams cinereus of my Synopsis of the BombycidiE of the United States (Proc. Ent. Soc. Phil., iii, 

 p. .372). The type of this species was formerly in the INIuseum of the Peabody Academy of Sciences, 

 but became lost or mislaid. It was much ruljbed, not "bowing the characteristic markings, the 

 descriiDtion being that of a worn specimen. It is tha Lochmceus olivatus of my report on Forest 

 Insects (p. 397), being erroneously determined as that species, and not the oiivata of my Synojisis. 



This is also H. pulverea of Riley and of my report on Forest Insects, p. 1.59, and elsewhere; 

 the pulrerca of Grote and Robinson is quite a different species, as I have ascertained from an 

 examination of their type in the American Museum of Natural History at New York. 



Larva (PI. XXXI, figs. 1, la — Id'). — Found on the sugar maple, July 10, at Brunswick, Me., 

 feeding on the underside of the leaf, eating out a little irregular patch; no eggs were to be dis- 

 covered. 



Stage I. — Length, .'J mm. Head large, rounded, much wider than the body; pitchy chestnut, 

 or dull, dark amber. The body tapers gradually from the prothoracic segment to the end of the 

 body, which is elevated, as usual. Anal legs slender and as long as the eighth segment is thick; 

 paler at tips; cylindrical, aiul the tips are slightly eversible. The skin of the body is smooth and 

 shining, of a uniform pitchy, dull reddish color, with fine, narrow, thread-like, greenish yellow, 

 wavy lines. The dorsal region between the first thoracic and the eighth abdominal segments 

 is greenish yellow. 



The larva is the most remarkable of its family, in ])Ossessing at this stage an extraordinary 

 armature of nine pairs of enormous horns like those of a deer. (Fig. S3, III, a, h. c. d). The protho- 

 racic pair are nearly three times as large as those on the first abdominal segment, and arise from 

 a dark piceous plate; each horn is stout, about twice as long as the body is thick, with two stout 

 acute tines reaching forward and outward, and a third ui)ward, with a fourth small sharp one 

 projecting in front near the base; each tine beais a hair arising from near the end. The tines are 

 more or less rough and finely spinulose, especially on the opposing bases of those projecting 

 upward and backward. The second and third thoracic segments are smooth and unarmed and 

 nnich wrinkled transversely. On the first abdominal segment is a pair of long, slender horns 

 with the distal third smaller and bent forward and outward, with the end thickened and bearing 

 two or three minute spinules and a single long hair; this pair arises from a large black dorsal, 

 xnidivided plate, while those behind (on second to seventh segments) arise from a more rounded 

 black plate, divided into two half-moou-shaped pieces by a distinct greenish yellow space. Those 



