640 



NEW YORK STATE MUSEUM 



Studied by Mr Theodore Pen^ande, who had been interested in tlie insect 



for ()\t.'r 20 )'ears, and in i8gq sncceedetl in completing its life history. 



The tollowing is an abstract of his detailed notice. 



The rapidity of grftwth depends on the season. The galls usnally 



begin to ai:)pear in the latitude of Washington L). C, about the middle of 



April, attaining full growth towanl the end of May. Young stem mothers 



hatch a week or more Ijefore the leaves appear and frequentK' assemble in 



d 



Fig. 172 Hormaphis h.-imamelidis:rt = 

 twig and bud with young hirva in position 

 ^=young stem mother; r=antenna; f/^tarsiis 

 f-=rostriim; y=-=waxy rods, much enlarged 

 (After Pergande, U S. Dep't Agric. Div. Ent 

 Tech. Ser. 9. icjoi) 



rig. 173 Hormaphis h a m a m e I i d i s : rt = yonng larva; ^— pupa : 

 t— spring migrant ; </'=aiitenna, much enlarged, (.\fter Pergande, 

 U.S. Dep't Agric. Div. Ent. Tech. Ser. 9, igoi) 



considerable numbers awaiting the unfolding of the buds. The plant lice 

 settle along the midrib and the lateral veins of the unfolding leaves, and 

 soon cause a pale )ellowish green discoloration on the upper surface. The 

 few days old gall appears as a small blisterlike swelling on the upper side. 

 It develops rapidly and in May is quite convex or slightly conical, with the 

 opening on the under surface nearly closed. The young, galls are greenish 

 yellow with the tip more or less purplish. The fully developed gall is 

 shown on plate i, figure 7. 



The dormant season is passed as a winter egg deposited on the 



