102 
MEMOIRS OF THE ]S"ATIONAL ACADEMY OF SCIENCES. 
near tlie end to a sharp point. The pencils consist of three to fonr hairs arising from a pair of 
small Avarts, one close to but on each side of the median line and situa ted just behind each dark 
dorsal dash. On the sides of the second thoracic and the ninth abdominal segment is a black 
patcli, more or less oblong and Jagged on the u])per edge. The sutures between the segments 
are not black. The underside of the body is blackish. At the base of the abdomiual legs is a 
black ring, and another near the planta, and a longitudinal black strii)e doAvn the outside of the leg. 
Miss Soule adds that ‘‘the yellow one came out Avith the body black, the hair maltese-gray, 
lighter over the headj ])eucils darker gray Avith black tips. The gray one was like it.” 
Larr(f, Htage VI , — Length, .‘15 mm., August 11. Tlie hairs coiicealiug the body are now 
uniformly Avhite (Harris, referring to the living larva, says, “of a beautiful Avhite color having 
entirely clianged their color. The dorsal black lines are now moi-e connectedj the three loiig 
pencils are i)ale at base and black toward the tip. The lateral hhivk spots send two points 
upward, and the sutures are now black. The head is stained with black (m the vertex and along 
the sutures and around the mouth-parts. The thoracic and iibdomiual legs are black, but the 
plantiB of the abdomiiuil feet are pale. Most of the hairs are dark on the distal half but pale at 
the basal half, and fn)m the black lateral spots arise from two to four spindle-shaped black hairs; 
also several others which staud out from the mass of dull gray hairs, arising from minute tubercles 
along the sides of the body* The legs are hirsute, and the body is black beueatli. 
Miss Soule’s full-fed hxrvii was 51 mm. in length, “ densely covered Avith long silky hair, 
vai'ying in color from pure white to deep gray; i)encils almost black Avith black tips. Head gray. 
Body hardly to be seen, but black Avherever Ausible.” 
Summaiy of the larval changes. 
1. No glandular hairs, and in Stage I the body is already covered with long woolly soft hairs. 
2. lu the third stage appears the dorsal black stripe, and a single black peucil on the eighth 
uromere. 
3. The two other black thoracic i)encils appear in Stage lY. 
4. The hairs become yelloAv and the pencils bicolored, Avhile the lateral black spots appear in 
Stage Y. 
5. The last stage (Yl) is signalized by an entire change in color from ocher-yelloAV to Avhite 
or gray. 
Length of egg stage, sixteen to se\^enteeu days; of first larval stage, scA^eu days; Stage II, 
niue days; Stage 111, eight to nine days; Stage lY, four days; Stage YI, nine days (Harris); 
prepupal stage, three days (Harris’s pupal stage). 
Cocoon . — Harris states that it does not spin a cocoon, but probably enters the earth. Miss 
Soule also states that no signs of spiiiiiiug were found. 
According to Abbot, in Georgia the caterpillar “went into the ground June 20, came out the 
14th of July. Another went in the 17th of October and came out on the 2oth of April.” 
Habits. — Dr. Liatuer has described quite fully the larva of the other species {A. angeUva 
Grote) which feeds on the ash and syringa, trausibrming to the pupa state September 14. His 
larva seems to dilfer in tlie “numerous line black linings, among AA'hieh may be traced tAvo forming 
a vascular stripe and two similar lateral stripes on each side.” Lintuer also speaks of “four dorsal 
wliite lines, posteriorly black,” on the prothoracic segment, and also of “ short stiff red hairs on the 
sides of the second and third thoracic segments, and indeed it is eA'ident that the larAue of the 
two species differ considerably in markings.” Our larva, on the other baud, appears to be identical 
with that described by Harris (Correspondence, p. 307) uuder the name of forrefactaf Sm. 
and Abb., the two last stages of Avhich he describes. He found it on the burdock, and says tliat 
it “eats leaves of willow Avell,” and further on states that he found one “on a leaf of Prnmis 
virgmiana.^^ 
Miss Soule states that a female found at Nonquitt, Mass., laid a mass of eggs July 13, tlie 
larva; hatcliiug on the 2Gth. The first molt ocmrred August 2, the second August 5, the third 
August 10, the fourth August 15, the fifth August 20. The freshly hatched caterpillar rested on 
both sides of the sassafras (Sassafras officinale) and ash (Fraxinus) leaves, and moved very fast. 
■“ When touched they curled up like the arctiaiis. They drank greedily and ate their cast skin.” 
