236 MEMOIRS OF THE NATIONAL ACADEMY OP SCIENCES. 



two obliiiiu' tegular stripes tlie hinder part of the thorax is ihirk brown, ineluding a small tuft ou 

 the hinder edue of the thorax and a larj;(' two lobed flattened tuft, whieh covers tlio base of 

 the abdomen, the jiosterior edges of the double tuft beeominsi- blackish. 



Fore wings long, the apex produced as in II. i/itttirittn; the wing with usually distinct 

 scalloi)ed bands; two distinct uneiiual scallops at tlie insertion of the wing (obsolete 1:1 some 

 before me); middle double scalloi>ed 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 sjtace between the 

 middle and outer scalloi)ed lines; outer scalloped line very irregular, si^allops deep and heavy 

 black-brown, and 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 uari'ow linear black sjwts, the 

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

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

 last median 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 H. (/iittiritfa. In 

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

 green. 



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

 third of which is the beginning of an outer whitish line, forming two scalloi)s; 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 sul)marginal row of blackish si)ots ajipear through, but the series is not 

 dislocated: hind wings not marked, except by three submargiual dusky si)ots behind the second 

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



Expanse of wings, <5 , 4o mm.; 9 , 5.5 mm. (2.10 inches); length of body, c? , 20 to 21 mm.; 9 , 

 2;? mm. 



This species may be known by the foi-e wings being slightly more produced toward the apes 

 than those of H. <iiittiritt(i, by the clear space between the distinct middle and outer scalloj)ed 

 lines, and by the dislocated series of submarginal dnsky 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. Philadeli)hia is defective, as the type 

 specimen was rubbed and without the greenish tint of fresh si»ecimens.) 



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

 whitish discal patches. 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 

 H. [luttivHtd. The palpi arc 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 H. giittiritta they tend to become obsolete. 



The Franconia, N. H., specimens are less dark than those of 77. f/iiffiritta. In these si)eeiniens 

 the body and wings are suffused with ocherous yellow scales, while 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 <inttirittn have gi\-en me more trouble than almost any other 

 Notodontians, as they arc so liable to b(^ confounded. 



Jjuri-d. — The caterpillar of this species has been found by Professor Eiley feeding on the maple, 

 and closely resembling in the last stage the caterpillar of 77. fiiittivittn Packard, The type of my 

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

 Washington, 1). C, the moth appearing May 28. Mr. Howard L. ('lark has found it not 

 uncommonly in Rhode Island. My original type was from Maine. 



Sffif/c II. — The larva was received from Mr. .Joseph IJridgham, of Providence, R. I., July 1 

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

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

 brown spines. 



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

 thick, three-forked, rcddisii luown horns, like thos(! of a deer, the lowermost tine smaller than the 



