1()2 MEMOliiS OF THE NATIONAL ACADEMY OF SCIENCES. 



uear the end to a sliarp point. The pencils consist of tliree to four hairs arising' from a pair of 

 small warts, one close to but on each side of the median line and situated just behind each dark 

 doisal (lash. On the sides of the second thoracic and the ninth abdominal segment is a black 

 patch, more or less oblong and jagged on the u|)per edge. The sntuies between the segments 

 are not black. The underside of the body is blaikish. At the base of the abdominal legs is a 

 black ring, and another near the planta, and a longitudinal black strijie down the outside of the leg. 



Miss Soule adds that '• the yellow one came <iut with the body black, the hair nuiltese-gray, 

 lighter over the head; i)enciis darker gray with black tips. The gray one was like it."' 



Larva, Stage VI. — Length, 3.") mm., August 11. The hairs concealing the body are now 

 uniformly white (Harris, referring to the living larva, says, "of a beautiful white color"), having 

 entirely changed their color. Tlu^ dorsal black lines are now moie connected; the three long- 

 pencils are pale at base and black toward the tip. The lateral black spots send two points 

 ui)ward, and the sutures are now black. The head is stained with black on the verte.x and along 

 the sutures and around the mouth-parts. The thoracic and abdominal legs are black, but the 

 plant:e of the abdominal feet are pale. Most of the hairs are dark on the distal half but j)ale at 

 the basal half, and trom the black lateral spots arise from two to four spindle-shaped black hairs: 

 also several others which stand 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 beneath. 



Miss Soule's full-fed larva was .jl mm. in length, '-densely covered with long silky hair, 

 varying in color from pure wliitc to deep gray: pencils almost black with black tips. Head gray. 

 Body hardly to be seen, but black wherever visible."' 



Summari/ of the lityral rliaiigcs. 



1. No glandular hairs, and in Stage I the body is already covered with long woolly soft hairs. 



2. In the third stage appears the dorsal black stripe, and a single black pencil on the eighth 

 uromere. 



3. The two other black thoracic iiencils ai)V)ear in Stage IV. 



4. The hairs become yellow and the pencils bicolored, while the lateral black spots appear in 

 Stage V. 



5. The last stage (VI) is signalized l)y an entire change in color from ocher-yellow to white 

 or gray. 



Length of egg stage, sixteen to seventeen days; of first larval stage, seven days; Stage II, 

 nine days; Stage III, eight to nine days; Stage IV. four days: Stage VI, nine days (Harris); 

 prepupal stage, three days (Harris's pupal stage). 



Cocoon. — Harris states that it does not spin a cocoon, but ])rol)ably enters the earth. JMiss 

 Soule also states that no signs of spinning were found. 



According to Abbot, in Georgia the caterpillar "went into the ground June 20, came out the 

 14th of .luly. Another went in the 17th of October and came out on the 25th of April."' 



Hahiis. — Dr. I.intner has described quite fully the larva of the other species [A. ainjclica 

 Grote) which feeds on the ash and syringa, transforming to the pupa state September 14. His 

 larva seems to differ in the 'Mnunerous fine black linings, among which may be traced two forming 

 a vascular stripe and two sinn'lar lateral .stripes on each side."' Lintner also si)eaks of "four dorsal 

 white 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 evident that the larva^ of the 

 two species differ considerably in markings."' Oui- larva, on the othei- hand, ajjpears to be identical 

 with that described by Harris (Correspondence, p. 307) under the name of Asta.sia torrefuctaf Sm. 

 and Abb., the two last stages of which he describes. He found it on the burdock, and says that 

 it "eats leaves of willow well," and further on states that he found one "on a leaf of rnmux 

 virginiana."' 



Miss Soule states that a female found at Nonquitt, Mass., laid a mass of eggs July 13, the 

 larVcB hatching ou the 2(5th. The first molt occurred August 2, the second August 5, the third 

 August 10, the fourth August 15, the fifth August 2(i. Tiie freshly hatched caterpillar rested on 

 both sides of the sassafras (Sassafras officinale) and ash (Fraxinns) leaves, and moved very fast. 

 " When touched they curled up like the arctiaus. They drank greedily and ate their cast skin.'' 



