— 27 — 



Ichthyura albosigma Fitch. 



'I'he following: description is drawn ii]i from Mr. Ih-idgham's 

 colored drawings of tiie tliree last stages, and an alcoliolic speci- 

 men of the mature larva, it occurred on the poplar, July 9 to 13, 

 those in the three last stages occurring at these dates. Other 

 specimens were reared by Mr. I'ridgham and the moths obtained 

 frcMii them. 



/.arra ill sfai^c ///. — Length, 26 mm. Heail as wide as the 

 bodv, reddish. The body reddish on the sides, and green along 

 the back, interrupted by a reddish patch on ist and one on the 

 8th abdominal segments, each of which encloses a median tubercle. 

 The green back encloses three parallel dark-green, indistinct, in- 

 terrupted lines. There are two greenish tubercles on the side of 

 the body, one above and tlie other below the spiracle. 



Stai:;c //'. — Length, 30 mm. The hair is still reddish, but the 

 body has now lost its green shade on the back, which is pale, with 

 three darker parallel dorsal lines. The two median tubercles are 

 now as well developed as in the last stage. The side of the body 

 is pale reddish, with dark lateral tubercles on the thoracic and ist 

 abdominal segments ; those on the succeeding segments being 

 yellowish, as on the abdominal legs, including the anal jxiir and 

 suranal plate. 'I'he thoracic legs are pale. 



Fi///-/c(/ Larvii. — Length, 30 mm. Heail hardly as wide as the 

 bodv, black, with a v-shajx'd, pale-brown line in front, formed of 

 a median line extending down from the vertex to the apex of the 

 clyi)eus, and then dividing so as to extend down on each side, 

 ending before reaching the antenna;. The head is flattened and 

 densely covered with grayish hairs. The three thoracic segments 

 bear each six lateral rather large, yellowish warts, the lowest one 

 the largest, each bearing about 6 or 7 hairs of unequal length. 

 There is a high median finger-shaped, fleshy nutant black tuber- 

 cle on the ist abdominal segment, bearing numerous short, un- 

 e(|ual hairs ; it is rather high, finger-shaped, and bent over back- 

 wards. On the 8th segment is a shorter, smaller, i)aler one. // 

 is evidently of double orit^i/i, its longest diameter being transverse to 

 the body, and somewhat wedge-shaped ; the end is somewdiat 

 swollen on each side, with a slight valley between the swellings, 

 showing that it was originally formed of two sejiarate tubercles, 

 and this is also suggested by the fact that each swelling bears 

 eight or ten short unequal hairs, i'he thoracic legs are black ; 

 the abdominal legs are dark, especially towards the jilanta. 



