254 MAINE AGRICULTURAI, EXPERIMENT STATION. I914. 



as P. alnifoliae Williams. Tullgren (1909) has described a 

 species as Prociphilus crataegi which is closely allied to the 

 species in this country and may perhaps prove to be the same. 



The spring migrants take flight from the primary host from 

 the middle of June to early in July. The summer host is not 

 known. 



Stem female. The first generation becomes mature early in 

 June in this vicinity. While immature this form is of a soft 

 greenish color and fiocculent. A single individual is found in 

 each infested' leaf. Usually by June 5 these stem females 

 begin to produce and the young are pale green and fiocculent. 

 When old and wrinkled the stem female becomes dark. The 

 beak reaches the second coxa. The antenna is 5-jointed. 



Alate female. Spring migrant. Both my notes and what 

 collections I have would indicate that the entire second gen- 

 eration become winged. A freshly molted individual has a 

 light brown head and prothorax, thorax paler than head, wing 

 veins delicate and abdomen pale olive green. Later the lobes 

 are all purplish black; wings hyaline, with dark slender veins, 

 and stigma conspicuously dark; abdomen rather brig*ht green. 

 The antenna is sometimes with and sometimes without annular 

 sensoria on VI. The relative lengths of IV and V are some- 

 what variable, V sometimes being decidedly longer than IV and 

 sometimes coequal or even slightly shorter. 



Newly molted pupae are yellow, later they are colored much 

 as the freshly molted winged form and fiocculent. In this 

 stage the insect is decorated with woolly tufts on head and 

 thorax, the abdomen is fiocculent along caudal and lateral 

 margins while along -the mid-dorsum the wax appears in 

 little tufts arranged in two rows converging at thorax. 



By detaining spring migrants in captivity I have secured 

 third generation nymphs. These in the first instar have a 4- 

 jointed antenna. Their long beaks extend by the length of the 

 two terminal joints beyond the cauda. Where these nymphs 

 develop is not known as we have no clue as to the summer host. 



Maine collection numbers 14-06; 27-06; 40-06; 3-07; 29-10; 

 16-11 ; 37-13. An Ithaca (New York) collection taken May 

 19, 1911, had only immature stem females. 



