INSECTS AFFECTING PARK AND WOODLAND TREES 553 



twig near the end of the Ijranch ami remain Linhalchcd till the followinL( 

 sprincr. 



Natural enemies. This species is very subject to the attack of para- 

 sites, and we have bred from one nest a nu.mber of s[)ecimens of M acro- 

 c e n t r u s s o 1 i il a t^^ i n i s Cress. This and other species art! undoubtedly 

 of considerable value in keeping the pest in control. 



Serica sericea 111. was taken on alder at Karner June 8, igo2. It is 



common in Herkimer county on the blossoms of wild cherry, visiting these 



trees when in bloom. 



Pteronus thoracicus Harrington 



A greenish, solitary sawfiy larva resting on its venter on the under surface of shad- 

 bush leaves (A m e 1 a n c h i e r c a n a d e n s i s) may belong to this species. 



This larva was met with by Dr Dyar at Plattsburg X. Y. and its 

 various stages have been characterized by liim as follows : 



First stage. Head round, higher than wide, but not narrowing to 

 vertex, shining, eye black, mouth brown ; width .25 mm. 



Second stage. Similar; eye surrounded by a black sj^n ; head rather 

 higher ; width .33 mm 



Third stage. Head almost whitish, pale ; wititli .5 mm ; joint 2 small, 

 making the head api)ear prominent. Body nuicii as in the ft)llowing stages, 

 but paler. 



Fourth stage. As in the next stage in aN points, but a little paler, 

 though darker than in the previous stage ; width of head .7 mm. 



Fifth starve. Head round, smooth, shining, greenish testaceous, 

 prominent; eye black, mouth brown; widtii i mm. Thorax a little 

 enlarged, the feet spreading widely, not concealed. Al)domen slightly 

 tapering posteriorly, gradually becoming smaller from the thorax ; feet 

 present on joints 6-1 1 and 13 ; segments 4-annulate, smooth, without tuber- 

 cles, not shining ; color j^ale clear green, the alimentary canal showing dark 

 green or the surface covered with a slight white bloom. Thoracic feet 

 watery greenish ; abdominal ones short, concolorous with the pale sub\eniral 

 region ; anal plate rounded. 



Sixth stage. As before, width of head 1.4 mm. 



Seventh stage. Head held forward ; liglit testaceous, faintly brownish, 

 smooth, shining, minutely reticulated ; c\e black, mouth brown; width 

 2 mm; joint 2 depressed anteriorly. All as in the previous two stages; 

 skin smooth, but not shining ; at the end of this stage the larvai; fade to a 

 whitish color with a bright green dorsal l)and ami enter the earth without 

 moltintr. 



