INSECTS AFFECTING PARK AND WOODLAND TREES 



68 3 



injurious to the tree, though usually taken at the base 

 of the needles. This species probably has an exten- 

 sive rancre, as it has" been recorded from North Caro- 

 lina and Kansas. The larva are probably root feeders. 



Spruce sawfly 



Ptcronus integer Say 



Pale green, false caterpillars feed singly on spruce the latter 

 part of the summer. Fig. 203 Metachro ma 



m a r % i n a 1 i s, enlarged 



This species is stated by Dr Packard to be com- (original) 

 mon over the Northern States and may at times prove obnoxious. It occurs 

 on spruce in Maine during the latter part of the summer and feeds singly, 

 not being gregarious as in the case of many species. He states that pos- 

 sibly the fly appears in the fall, though probably it winters in the cocoon 

 and may be found abroad in the early part of June. The larva and its 

 cocoon have been described by Dr Packard as follows 1 : 



Larva. The body is long, broader than the head ; pale pea green ; of 

 the color of the leaves of the spruce among which it feeds. The head is 

 smooth, of the same color as the body, with a dark patch extending upward 

 behind each eye. Body not spotted, but with a dorsal dark green stripe, 

 bordered on each side with whitish glaucous green. Along the body is a 

 lateral conspicuous broad white stripe, the stripe much scalloped below. 

 Body beneath and abdominal legs uniformly green ; thoracic legs pale 

 honey yellow, except at base. Length i 7 mm. 



Cocoon. Of the usual oval cylindrical form ; of a pale horn color, 

 of the usual density, the walls being opaque. Length 13 mm; diameter 

 4 mm. 



The adult sawfly is about ^ inch long, yellow with black or dark 

 brown markings, except on the sides and venter of the abdomen, which are 

 a greenish tinge. 



Bibliography 



1890 Packard, A. S. U. S. Ent. Com. 5th Rep't, p. 838-39 1 



1896 Marlatt, C. L. U. S. Dep't Agric. Div. Ent. Tech. Ser. 3, p. 69 



1 Possibly the larva of another species. Dyar records Pteronus integer Say 

 as an oak feeder. N. Y. Ent. Soc. Jour. 1898. 6:122. 



