— 26 — 



The prothoracic shield is undivided ; in stage II it begins to 

 be divided, becoming separate in their last stages. 



3. Toward the end of the stage the three lateral lines are 

 indicated. ^' 



4. The hairs in stage I are glandular and ^lightly bulbous. 



5. The tubercles in stage I all give rise to but a single hair. 



6. The three dorsal dark reddish lines appear at the end of 

 stage II. 



7. The spiracular line appears in stage III. 



Ichthyura vau FitcJi. 



The young larva was found feeding on the aspen at Bruns- 

 wick, Me., and moulted Aug. 10-12, when it became 10 mm. in 

 length. 



Yoi/iiir /an'ii i/i jd stai:;c. — Length, 10 mm. Head black. 'I'he 

 body is on the sides and at the end livid dark brown. The warts 

 and humps on the 1st thoracic, and ist and 8th abdominal seg- 

 ments are of the same color, but the other piliferous dorsal warts 

 are yellow. There are four parallel whitish-gray dorsal lines, or 

 rather three dark, livid-brown, fine dorsal lines on a grayish-white 

 field. 



Last s/ai^c. — Length 25 mm. Head brown-black, flattened, as 

 wide as the body ; with gray hairs. The prothoracic plate is 

 widely divided into two transversely oval brown-black plates. The 

 body is marked with a broad, dorsal, ash-gray band, containing 

 three vandyke-brown more or less broken lines. The sides of the 

 body darker and containing two darker, irregular, broken lines. 

 On the 1st thoracic segment are no dorsal yellow warts, but two 

 on each side, the upper one in front of the spiracle, button-like, 

 prominent. On the 2d and 3d thoracic segments are four yellow- 

 tubercles, forming a transverse series. On the 2d to 8th abdom- 

 inal segments the yellow warts are arranged in a very low trape- 

 zoid, and the two anterior ones are ininute. Those on the 9th 

 segment form a curved line. The suranal plate is broad and 

 rounded, speckled with black. There are no humps or specialized 

 warts on the ist and 8th abdominal segments, thus differing from 

 the larva of /. i/ic/itsa. The thoracic legs are blackish ; the ab- 

 dominal and anal legs livid ash. 



The larva differs decidedly from that of 7. i/niiisa, though the 

 moth is lu-arlv allied. 



