OP ARTS AND SCIENCES. 85 



region raised in a sphinx-like attitude, jerking its head sideways when 

 disturbed. The pale chestnut face forms, with the folded thoracic feet, 

 a continuous patch of color, of the same tint as that of the leaf buds, 

 and the base of the leafstalks of the oak. In eating I do not see 

 that the maxilke and labium are of any service, but on the con- 

 trary seem to be in the way. Both are in lepidopterous larva? rudi- 

 mentary, and the labium in the main functions as a spinning organ. 



Stage IV. — Moulted July 11-12. Length 40 to 45 mm. This 

 differs but little from Stage III. The head is of the same color as 

 in the three previous stages, and about half as wide as the body. The 

 segments are rather more angular above than before. The prothoracic 

 segment is yellow in front ; the tubercles are small, and of the same 

 yellow tint. All the other tubercles, both dorsal and lateral, are 

 orauge-red ; the dorsal tubercles have on the outside of the base, and 

 extending nearly half-way up, a bright spot xoith a decided pearly color 

 and lustre ; this spot is wanting on the infraspiracular tubercles. Most 

 of the bristles are black broadly ringed with white, or white at the 

 base, and on the distal half. The median dorsal tubercle on the 8th 

 abdominal segment is still distinctly seen to be double, being bilobed 

 at the end, each lobe or subtubercle bearing about four white set^e, one 

 of them black. 



Along the sides of the body project long white hairs. The spiracles 

 are orange-brown, as before. The suraual plate is edged with flesh- 

 pink, and the anal legs are bordered behind with the same smooth 

 flesh-pink margin. The thoracic legs are reddish amber, black at their 

 ends. The middle abdominal legs are green ; the plant* livid pur- 

 plish ; above the planta is a dark patch, bordered above with yellowish. 



Stage V. — Moulted July 22-24. Length 60 mm. It now scarcely 

 differs from the preceding stage. The silver tint on the outside of 

 the base of the dorsal and subdorsal tubercles, and on the upper side 

 of the base of the infraspiracular tubercles, is a little more distinct than 

 in Stage IV., as in the latter stage the 2d and 3d thoracic dorsal and 

 subdorsal tubercles are more orange than those on the abdomen, which 

 are deep coral-red ; but in some of Stage IV., the thoracic ones are 

 coral-red. 



The head is reddish chestnut, and is the same in hue as in Stages 

 I. to IV. The prothoracic segment is edged with yellow, the pale yel- 

 lowish lateral stripe as in Stages III. and IV. The spiracles are deep 

 orange-red. The segments are now convex and almost angular, more 

 so than in the other native forms of this group, unless we except 

 A. luna. 



