401 



wlicii at rest in liofli sexes). 'VUv liody is fuller and plumper: alxloinen less 

 acn(e at tip. and not spined ns in A. vcniaUi. It is iinil'orndv asli-irray, with 

 the anterior ediic ol' the segments above (over \vhi(di the seicnient in iVont 

 moves) monse-eolored. A row of live lateral dorsal Mack spots mi the front 

 edge of each segmenl (sometimes wauling;. On the side is a row of liin- 

 black dots .situated nearer the middle of the segment than the large subdorsal 

 spots. Autenua' and feet eoneohtrous with the body. Beiie-ath, colors as 

 above. Length of a gravid female, 0.4()-().42 inch. 



For further descriptions of the head and thorax of this and the female 

 A. vernatu see the introduction, p. ;>S. 



Salem, ilass., October and Xovendxjr, on elm and apple trees; much 

 less common than A. veniuta (Packard); Cand)ridge. Mass. (Harris, Mann, 

 aforrison); November 20, 1848 (Harris). 



Egg, /an-ii, <in(l ))tipa. — Egg cylindrical, increasing in diameter anteri- 

 orly, where it is truncated, l)eing more rounded at tin; posterior end. On the 

 anterior end it is slightly convex, with a dark rim aromid the edire and a cen- 

 tral dej)ression Length, 0.03 inch. On the !Mh of April, IsT.j, the eggs of 

 this species were not developed, unless in a very early stage of the eud)ryo. 

 The larva is pale whitish-green as a ground-color, with a broad, brctwn, 

 dor.sal, median band and three lateral white lines, the middle of which is 

 fainter than the tw(j others. These are succeeded l)y a i)road, l)rown, spirac- 

 idar line, below which is a broad, continuous, white line. Body ix-neath flesh- 

 colored, without any median line. Head brown, with a whitish clypeal 

 region. Si.v abdominal leg.s reddish Hesh-color or whitish ; the third smaller 

 pair, situated on the fifth abdominal riu<r, ar(> (Uie-half or one-third as huge 

 as the adjoining ones, and are sometinu's mnch smaller, while in two or tliree 

 out of the twenty-seven specimens examined this pair was nearly obsolete. 

 These specimens were gathered from several ap[)le-trees, June If), in my 

 garden (Salem, Ma.ss.). It varies a good deal, with a iieueral tendency to 

 become darker, approaching in some; cases remarkably near A. vcmata Harris 

 in cobration, the brown lines !)eing nu)re prevalent, the liiziit lines being finer 

 and slightly interrupted. 



There thus seems a decided tendency in the aulumnal species to approach 

 the spring (?;e;7?rtte) ; and as the latter is the more aliuudant and wide-spread, 

 it is possible that autumnata is a derivation of vernatu. As if in confirma- 

 tion of this view, vernata, when it varies, becomes paler, and in some cases so 

 51 p u 



