INSECTS AFFECTING PARK AND WOODLAND TREES 56 1 



dorsal stripes and larger supralateral ones on the middle of each segment. 

 There is a more or less indistinct lateral, dark brown or black line bordered 

 above and below ,b,y grayish or yellowish. The stripes above and below 

 this indistinct line are lighter and irregularly mottled with grayish or 

 yellowish. The true legs are jet black, prolegs dusky orange or yellowish. 



The moth has a wing spread of a little over an inch, the fore and hind 



wings being pale gray, the latter sparsely marked with dark brown scales 



[pi. 16, fig. 2]. 



Life history. The eggs of this species, according to Riley, occur in 

 April, May, July and August, the larvae from May to July and August to 

 September, adults March, April, May and July and August. There are 

 evidently two generations annually. 



Pteronus mendicus Walsh 

 A yellowish, leaf-feeding species. This sawfly larva was taken on wil- 

 low in Central park and also at Plattsburg by Dr Dyar, who describes its 

 method of oviposition and early stages as follows : 



Egg. Laid anywhere on the leaf in semicircular saw cuts just under 

 the upper epidermis ; cuts 1.5 mm in diameter. 



First stage. Head blackish testaceous, shining, eye and mouth black; 

 higher than the body; width .3 mm. Body indistinctly 4-annulate, not very 

 shining, greenish. Thoracic feet and anal prongs blackish ; abdominal feet 

 on joints 6-1 1 and 13. 



Second stage. Head dull testaceous, a blackish longitudinal line at the 

 vertex, one upward from each ocellus ; eye black, mouth brown ; width 

 .55 mm. Body dull greenish, thoracic feet concolorous ; a faint blackish 

 tinge above spiracles and a little on subventral ridge on joints 2-4, pale 

 along dorsal line ; posterior portion of the body curved under so as to touch 

 the venter ; anal prongs blackish. 



Third stage. Head rounded, flattened before, pale green, fainlly 

 brownish tinged; a black longitudinal line over the vertex, reaching top of 

 clypeus ; a lateral transverse line over ocellus, not quite reaching vertex; 

 mouth brown ; width .9 mm. Body soft, leaf-green, a faint blackish dorsal 

 and substigmatal shade line ; venter a shade paler. Feet small, green ; anal 

 prongs blackish. Body scarcely annulate, not shining; tracheae showing as 

 a white line. 



Fourth stage. Head clear green, marked as before, the marks clouded, 

 not so black as ocelli; an additional patch at apex of clypeus ; width T.15 

 mm. Body uniform leaf-green, not shining, except in the creases of the 



