6 



orly and centrally; narrow median dorsal area whiter; lateral 

 oblique, sinuate grooves darker. In front of the shagreened area 

 are a few short erect hairs, with larger ones placed laterally on 

 this segment. On the next segment there are but two lateral 

 hairs on each side, and none on other segments until the eleventh, 

 which has a single stout bristle on each side considerably above 

 the margin, and a transverse row of hairs along the posterior 

 margin. The anal segment has a considerable number of long 

 curved hairs along the lateral and posterior areas. The lateral 

 margins of each of the abdominal segments, just below the 

 spiracles, have an inflated appearance, and segments three to 

 ten inclusive are strongly sculptured, especially on the dorsal 

 surface, by transverse, tubercular, flattened ridges w T hich are 

 minutely shagreened. The sculpture of these is clearly shown 

 in Fig. 3, PI. I. The lateral inflations, with deep intervening 

 constrictions, give the larva when extended a somewhat monil- 

 iform aspect. 



The Pupa. (PI. I., Fig. 4.) 



Length, 13 mm.; color uniformly light yellow; head with 

 nearly triangular impressed area between the bases of the an- 

 tennae, on each side of which are a pair of closely set hairs. 

 There are two clusters of minute spinules on the clypeus. The 

 antennas, being abruptly bent downward, give the head a de- 

 cidedly square appearance. They extend backward to just be- 

 yond the middle femora, where they turn forward along and out- 

 side of the anterior and middle legs, the posterior pair of legs 

 being folded under the wings. There is a minute, robust, hooked 

 spine on the marginal ridge of each of the abdominal segments 

 except the terminal, the hooks being reversed; there is also on 

 each of these segments a transverse dorsal elevation armed 

 with irregularly placed, minute, stout spines. The terminal 

 s gment is provided with a number of long hairs. 



LIFE HISTORY. 



There is a single annual generation, the larvae hibernating 

 in the twigs and finishing their development in the spring, the 



