100 JOHN B. SMITH. 



►Soc. Phil, iii, 646, from which the following is taken in order to pre- 

 sent fully the differences supposed to exist between this and other 

 species hereafter mentioned. 



Lenjjth 1.75 iuch.es. Head elliptical, giauulated, dull green, when at rest par- 

 tiallj- buried within the first segment. Mandibles yellow, black tipped. Body 

 tapering anteriorly from the seventh segment, clear green, lighter dorsally, 

 shading darker to the stigmata, below which to the prolegs it is of a uniform 

 darker hue; underneath, from the third pair of legs to the terminal pair, dull 

 rose, bordered externally by a buff stripe, continued to the sixth segment and 

 inflated above the prolegs. First segment carinated on its anterior margin su- 

 l>eriorly, upon which are about sixteen light yellow granulations. Collar studded 

 with smaller, light green granulations; vascular stripe bordered by two white 

 lines, commencing on the second segment, becoming wider and more distinct on 

 the central segments and uniting anterior to the base of the caudal horn : a white, 

 sometimes yellow green subdorsal line, commencing on the second segment, 

 running midway between the stigmata and dorsum and terminating in the sides 

 of the caudal horn, made up of a white spot on each annulation, except on the 

 smooth eleventh segment, where it is continuous; white ocellations on the annu- 

 lations above the stigmata. Stigmata red, with a white dot at each extremity. 

 Caudal horn .2 inch, in length, curved, light blue, yellow tipped, granulated with 

 white laterally, with black anteriorly and a few granulations posteriorly ; caudal 

 shield and plates granulated like the collar. Legs, basal joint black, tipped. 

 Prolegs green, with a fusiform black spot exteriorly. In readiness for pujiation 

 the larva changes as follows: Head purple; the granulations of the first segment 

 ochre yellow ; between the subdorsal lines purple or reddish brown; laterally 

 and veutrally pea green. Forms a slight cocoon among the leaves on the ground. 

 Pupa 1 — 1.10 inches in lesigth, broadest at about the middle, tapering thence 

 regularly to the extremities; entire surface shagreened ; color brownish black, 

 with reddish brown on the movable segments posteriorly— and anterior to the 

 stigmata, prominent transverse wrinkles — showing only when the segments are 

 bent on one side, as they usually are, to such a degree as to bring the terminal 

 spine at nearly a right angle with the central segments. Segments 3-8 inclusive, 

 prominently ridged transversely. Head case produced, subtriangular anteriorly. 

 Antennae cases terminating midway between the tips of the middle and poste 

 rior leg-cases in the 9- Tongue case buried. Stigmata brown, oval ; terminal 

 si)ine broad at base, prominent, flat, rounded towards the tip, showing under a 

 lens a marginal row of about ten delicate curved reflected spines on each side 

 and a larger terminal double hook, by which the pupa is attached to some trans- 

 verse threads in its cocoon. 



Feeds on the Snow ball ( Vibu7'm(m opulus) the imago emerging 

 early in jNIay. 



Mr. Hulst gives a somewhat different de.scription in Bull. Bkln. 

 Ent. Soc. ii, 38 ; according to him : 



"The mature larva has the head deep green, large, closely sessile upon the 

 body. The head is partly retractile beneath the first segment of the body. The 

 body is nearly cylindrical, enlarging moderately from the first to the fourth seg- 

 ments. The first segment has a collar above, which is edged with yellow and 



