IXSECTS AFFECTING PARK AM) WOODLAND TREES 569 



to feed in Aiic^iist aiul Septemlx-r on tlic luulcrsidc of willow and poplar 

 leaves, the adults appeariny^ in June. 



Description. The larvae of this insect ha\(.' In-en described 1)\' I)r 

 Lintner as follows : 



When near maturity, they were " io of an inch long, of an orange-yellow 

 color, with two rows upon the back (subdorsal) of 12 large irregularly 

 rounded black spots, measuring in diameter about yi the length of the seg- 

 ment. There is also a row on the side (stigmatal) of 12 smaller black spots, 

 of which the 2 anterior ones are the largest, and semicircular in form. 

 Numerous short white hairs are given out from two transverse rows of 

 tubercles on each segment, tlie longest of which about ecjuals one half the 

 diameter of the body. The head is black superiorly and laterally, v.ith a 

 central black spot in front surrounded with brown. The tarsal hooks are 

 brown. 



^Iditlt. Head, shining black, short, broad, not so wide as the thorax ; 

 antennae brown, the seven long joints are slender, tapering regularly to the 

 last. Thorax black above, yellow lateral.ly.and beneath, except posteriori)- 

 where it is black. Abdomen yellow, distinctly incised, short, tlat, subo\oid ; 

 legs yellow. Wings yellowish towards the base and particularly on the 

 costa ; the stigma large, conspicuous, with a black spot on its base. 



Bibliography 



188S Lintner, J. A. Ins. X. V. 4ih Rep't. p. 44-46 

 1889 Ins. X. V. 7th Rei)'t, J). 223-24 



Pteronus hudsonii Dyar 



Black-headed, bluish or Icaf-grcen savvlly larvae with series of orange-yellow, large 

 blotches on segments 3-12 and numerous black spots, sit on the edge of poplar leaves. 



The larva has been described by I)r Dyar as follows: 



Larva. .Sitting on the edtre of a leaf and thrashing the abdomen 

 about when disturbed. Head normal, round, black, sutures paler; witlth 

 2.2 mm. Thoracic feet motlerate, pale, abilominal ones on joints 6-1 i, 13, 

 well developed ; short black anal spines. Piody smooth, shining, faintly 

 3-annulate, dorsal vessel yellowish ; color bluish or leaf-green, with a .series 

 of orange-yellow, large lateral blotches on joints 3-12 and numerous black 

 spots as follows: two transverse rows per segment above the spiracles, the 

 anterior of three on each side, the posterior of foin-, its lower (lateral) one 

 largest ; two black patches on the halves of the sidjventral ridge, the lower 

 posterior one somewhat broken ; on joint 13 a large lateral black patch and 

 dorsal suranal blackish cloud. . 



