236 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



two obli(iue ti'gulai- striiies the hiiulcr parr of the thorax is dark brown, iuclndiiig a small tuft oil 

 the liiuder cd.ue of the thorax aud a larjje two lobed Hatteiied tuft, which covers the base of 

 the abdomen, the ))osterior edges of the double tuft becoming blackish. 



Fore wings long, the apex produced as in H. (/uifirittd; the wing with usually distinct 

 scalloped bands; two distinct unequal scallops at the insertion of the wing (obsolete iu some 

 before me); middle doable-scalloped line well marked; the scallops uneven, two in median space, 

 the largest one rectangular; a short acute scallop in front of the median vein and extended 

 oufrward along it; two nearly even-sized scallops on the costal edge; a clear space between the 

 middle and outer scalloped lines; outer scalloped line very irregular, scallops deep and heavy 

 black-brown, aud the line of scallops curving inward from the cubital vein to near the apex on 

 the costa. The costal edge on outer third with three distinct narrow linear black spots, the 

 venules marked with black and whitish gray scales (iu some males this outer line is almost 

 obsolete). A vSubmargiual row of eight blackish spots, three of which are situated behind the 

 last metliau venule; this series is plainly dislocated, the subapical three being set farther inward 

 than those below, and this is a ready means of separating the species from II. {luttirlitu. In 

 three females the fore wings and thorax are yellowish green, while iu the male of a clear sea- 

 green. 



Hind wings uniforndy mouse-colored or dusky ashen, yellowish on the costa, on the outer 

 third of which is the beginning of an outer whitish line, forming two scallops; the wing is 

 sometimes pale, almost whitish at base, but dusky toward and at the margin. 



Beneath, the fore wings are clear ash, the costa a little dusky, with fine blackish linear marks 

 toward the apex; the submarginal row of blackish spots appear through, but the series is not 

 dislocated: hind wings not marked, except by three' submarginal dusky spots behind the second 

 median venule at the internal angle; abdomen ash, with a faint yellow-green tint. 



Expanse of wings, $ , 45 mm.; 9 , 55 mm. (2.10 inches); length of body, $ , 20 to 21 mm.; 9 , 

 23 mm. 



This species may be known by the fore wings being slightly more inoduced toward the apex 

 than those of //. (/iittiriffa, by the clear space between the distinct middle and outer scalloped 

 lines, and by the dislocated series of submarginal dusky spots; the wings in the male are uniformly 

 sea or olive green, while in some individuals the hind wings are yellowish green or rather brown. 

 (My original description in third vol. Proc. Ent. Soc. Philadel])hia is defective, as the type 

 specimen was rubbed and without the greenish tint of fresh specimens.) 



From H. gutHvltta it is distinguished by being more uniformly olive-green and by the lack of 

 whitish discal ])atches. The discal spot is almost obsolete, and with only a^slightly marked dusky 

 patch. beneath, this blackish patch being sometimes large and cons])icuous in some examples of 

 E. guttivitta. The palpi are also larger, the third joint longer and slenderer, and the second joint 

 is black externally; the scalloped lines are more distinct, and this holds for old rubbed specimens, 

 while in //. guttivitta they tend to become obsolete. 



The Franconia, N. H., specimens are less dark than those of H. guttivitta. In these specimens 

 the body and wings are suffused with ocherous yellow scales, wliile in one from Florida, kindly 

 given me by Mrs. Slosson, the body and wings are decidedly reddish brown, including the thorax 

 and end of the abdomen. This and guttivitta have given me more trouble than almost any other 

 Notodoiitians, as they are so liable to be confounded. 



Larva. — The caterpillar of this species has been found by Professor Riley feeding on the maple, 

 and closely resembling in the last stage the catoriiillar of //. guttivitta Packard. The type of my 

 original description was captured by myself in Brunswick, Me.; Professor Riley's was bred iu 

 Washington, D. C, the moth appearing May 28. Mr. Howard L. Clark has found it not 

 uncommonly in Rhode Island. l\[y original type was from Maine. 



fStagv II. — The larva was recei\ed from Mr. Joseph P.ridgham, of Providence, R. I., July 1 

 (PI. XXXII, figs. 1, la). Length, 7 mm. Easily recognized by the pair of three-forked dorsal 

 prothoracic reddish brown horns, while on each abdominal segment is a pair of sharp conical 

 brown spines. 



The head is rcmnded. reddish brown, with no tubercles or markings. A pair of large, high, 

 thick, three-forked, reddish brown horns, like those of a deer, the lowermost tine smaller than the 



