78 MAINE AGRICUIvTURAL EXPERIMENT STATION. I913. 



103-12, Veazie, July 18, 1912. Pinkish galls along the mid- 

 rib on the dorsal side opening on the ventral surface. Fig. 49. 



Pemphigus bursarius Linn? A species closely allied to, if 

 not identical with bursarius of Europe (Tullgren 1909) is com- 

 mon on poplar here. The life cycle is not ascertained but 

 breeding tests for an alternate host are planned. The antenna 

 and wing are represented by figures 28 and 46 B. 



Fig. 28. P. bursaruis. Antenna of spring migrant. 



The gall is found on the petiole of the leaf in the form of. 

 irregular swellings of varied size, anywhere from near the base 

 of the leaf to the extreme proximal end of the petiole. Gall 

 causes curve in the petiole or sometimes a confused twist where 

 two or three galls are crowded close together. Galls are also 

 sometimes found on the new growth twig itself. The opening 

 is a rather lip like slit usually transverse to the petiole. Fig. 

 48. 



Collection data are as follows : — 

 . 60-06, and 65-10, July 7 and 10, 1906. Irregular globular 

 galls on petiole containing winged forms and pupse. 



64-06, July 10, 1906. Irregular globular galls on new growth 

 twigs of Popiihis. 



28-11, Orono Campus. Populns deltoides Marsh (var. Caro- 

 lina poplar) July 12, 191 1, Galls contained stem mother, small 

 nymphs, pupse and winged migrants. 



Chaitophorus populicola Thomas. This well marked species 

 does not seem to be confused with other American species 

 either in our literature or collections. Common in Maine on 

 Cottonwood, American Aspen {P. trermiloides) and Balsam 

 Poplar [P. balsamifera). 



Alate viviparous form. General color a varnished black. 

 Antenna black with III paler. Sensoria as shown in figure 29. 

 Abdomen black, hirsute with cornicles yellow. Wing veins 

 black and heavily shadowed, shadow broader at tip of veins 

 especially with the two discoidals where it broadens to a dark 

 \r. Fig. 46 K. 



