CATERPILLARS OF THE FIR, 865 



iucised ; when at rest retracted partly under the projecting prothoracic segment. 

 The last segment with a large triangular thick lateral flap. Two dorsal dull yellow- 

 ish sinuous lines, separated by a narrow median reddish line. Body beneath with 

 dull obscure sinuous, somewhat broken, coarse yellowish lines. On the last segment 

 are two high sharp tubercles. Supra-anal plate rounded. Body roughly granulated. 

 A light dull whitish yellow lateral stripe, extending down on the anal legs. Length, 

 15"™. 



Some of the caterpillars occurring on the fir have a smoother body, less wrinkled, 

 and the head is not red, but pale green. There is a conspicuous white spiracular 

 line; and two subdorsal pale yellowish indistinct lines; the sutures are distinctly 

 yellow. 



Pupa. — Of the usual form, rather slender, brown, the abdomen bright brick-red 

 above between the wing-covers ; the end horn-brown and mottled ; there is a blackish 

 dorsal line and a dark stripe along the antennse and veins of the wing, the branches 

 being spotted with black. In another specimen the wing-covers were red and the 

 body, including the abdomen, horn-colored ; the terminal spine is short, moderately 

 stout, with eight unequal curved slender spinules. Length, 9 to lO""™. 



Moth. — Six specimens, two of them males, issued from the chrysalids in the breeding 

 box, in Providence, between April 20 and 25. They were all of uniform size, the 

 wings expanding about 25™™. They differed but slightly from A. mimosaria, though 

 much smaller ; compared with one of the latter the hind wings are more angulated, 

 while the outer white line on the same wings is less bent in the middle. The lines 

 on the fore wings are as in A. mimosaria, but vary in distance apart. The head and 

 abdomen are marked as in A. mimosaria ; the male hind tibise are as in that species. 

 It dififers decidedly from the two other species of its size, A. approximaria and Jatiaria. 



14. Semiothisa bisignata (Walker). 

 (Larva, Plate xxxii; fig. 1, la-lh.) 



Though more commou on the pine, the figures on Plate xxxii were 

 drawn from a specimen collected on the fir, at Brunswick, Me., August 

 27-30. For details see Explanations of the Plates. 



It also occurred on the pitch pine July 15 to August 3, at Bruns- 

 wick, Maine. 



15. The fir-needle inch-worm. 



Eupithecia luteata Pack. 



Order Lepidoptera ; family Phal.enid.e. 



(Larva, Plate x; fig. 4.) 



This is a common caterpillar on evergreen trees, excepting the pine, 

 and was described in Bulletin 7, U. S. Entomological Commission, p. 237; 

 No. 8 also, p. 206, No. 83. The caterpillar is rather flat, the surface 

 granulated, the body reddish and bearing a remarkable resemblance to 

 a red, dead fir-leaf. It tarns to a chrysalis late in August and early in 

 September in Maine, and the moth appears the following May and June. 



This is one of the most remarkable cases of mimicry yet noticed among 

 those feeding on coniferous trees. Often on beating them into an um- 

 brella, which I used in collecting caterpillars, have I hesitated to pick 

 5 ENT 55 



