MEMOIRS OF THE NATI0:N^AL ACADEMY OF SCIENCES. 269 



white; extrahasiUir line of Jive done, lanje hluck dofx, tlic line iutcrrupted as if a dot on the 

 suboubital fold had diopiied out. The hhirJc mcdiun Ixdid viuiuhuUi/ broad and ntrair/ht on each 

 aide, with a distinct, finii, bhicik edge ou each side, especially within, and the band is thickly dusted 

 with white scales. A heavy outer parallel line close to the baud, slightly sinuous, beginning ou 

 the inner edge and ending on the first cubital venule. A distinct scall()])ed white extradiscal 

 line, edged with black on each side, and an inner faint dusky line between it and the discal spot, 

 the latter being elongated and distinct. The usual subapical triangular patch extends backward 

 farther than usual, being continuous with the outer of the extradiscal lines. Marginal black dots 

 distinct. 



Hind wings white, a large difi'use discal dot, marginal black dots distinct; a small dark patch 

 ou internal angle. Underside of fore wings dusky, the outer edge of the wings a little whiter; the 

 white extradiscal line appears through. Hind wings white, with a large difluse discal oval mark 

 and distinct dots. 



Expanse of wings, S oU mm.; length of body, i 14 mm. 



This line species is known by the broad black band, dusted with white, anrt distinctly edged 

 with black within and without; by the extrabasilar line of five large crowded dots, and by the 

 distinct white scalloped broad extradiscal line. Lintner says that in respect to the extrabasilar 

 row of five dots it does not differ from aqidloHaris, but thus far I have not seen an example of the 

 latter with more tlian four dots, the row not being so crowded. 



Larva, Stage II. — Length of body, 11 mm.; of steniapods, 8 mm. It differs from the foregoing 

 species of the same stage in wanting the frontal tubercles of the head, which is paler, and in the 

 longer and slenderer prothoracic horns, the latter liaving smaller spines; it is also j-ellow 

 beneath. The spines on tlie steniapods are finer. There is more yellow on the sides of the body, 

 the yellow extending along the sides of the stemapods. 



Stage III. — Length of body, 15 mm.; of steniapods, 4 mm. It differs from the third stage of 

 Cerura borealis in the longer cervical shield and the shorter horns, so that the shield is more 

 normal in shape, being as usual in many caterpillars. The piliferous warts over the body are a 

 little larger, while the dorsal reddish saddle-like spots are more definitely lined with deep red. 



Larva. — Length when fully grown, 1.25 to the fork of the tail. Body slightly enlarged in 

 front and somewhat coni])ressed. In about the middle of the prothoracic segment is a prominent 

 projection on each side, the body sloping from these down to the rather small head; there is but 

 little sloping from the back to segment 9; from this there is a rapid sloping to the anal segment, 

 this ending in the two usual caudal filaments; when withdrawn these are a little more than a 

 quarter of an inch long, but may be extended to three-quarters. Clear bright green, sides spotted 

 with clear purple brown, the spots round the stigmata and at the base of the thoracic and abdom- 

 inal legs the largest. The back is marked with lilac, varying in shade, and arranged as follows: 

 From the two small contiguous tubercles ou the back of joint 2 to the head is a somewhat 

 ■diamond-shaped space, the broadest part at the subdorsal tubercles on the jirothoracic segment. 

 From the tubercles on this segment to those on the next the lilac is bordered by bright brownish 

 purple with a white line; outside of this, in the middle of this diamond, is a little green shading. 

 From the tubercles ou the second joint from the head to the end of the body is another parti- 

 colored space, lighter than the anterior one. This gradually expands so as to include the 

 stigmata on segment 7, then decreases in width to the anterior part of the anal segment, 

 expanding a little in the middle of this, but contracting again at its posterior part. The lilac of 

 this is like the first, considerably sufi'used with green on the back, and is bordered with brownish 

 purple and white, though the colors are a little lighter posteriorly. These two dorsal patches are 

 not continuous, but are separated ou the second segment by a distinct though small patch of 

 green. The posterior projections are mostly brownish purple, though with somewhat greenish 

 annulations, and when extended a ring of white near the extremity. Head dark lilac. Previous 

 to the last molt the tubercles on the prothoracic segment ("joint 1") were covered with little 

 spines (French. Can. Ent, xiii, 144.) 



Food ])lant. — Willow. 



Habits. — The caterpillars of this moth were found feeding on willows {Salix nigra) by Prof. 

 G. H. French, at Carbondale, 111., from Sei)tember 9 to October 5. The moths began to appear the 

 following season from April 30 to June 3. In Maine it occurred on the willow throughout August. 



