646 



NEW YORK STATE MUSEUM 



conspicuous waxy tufts [fig. 181]. They settle in folds on the underside 

 of the developing leaves and produce pseudogalls caused by the area 

 between the veins bulging and forming ridges or corrugations [fig. 182]. 



These galls are reddish brown, , 

 soon changing to reddish or crim- 

 sj^J^^jp^ son. The young attain their growth 

 by the end of April or early in May 

 and then produce a fifth generation, 

 which is sometimes abundant enough 

 to seriously injure the trees. This 

 latter, on attaining its development, 



Fig. 183 Hamamelistes spinosus, 6th or sexual genera- 

 tion : «=dorsal view of young larva ; 4=the same denuded ; HI igrateS early ill June back tO 

 showing arrangement of pores; r=tarsus ; */=lateral tubercle 



and waxy rod; <-=apex of lateral tubercle, much enlarged tile witcll-liazel, where tile SeXUal 

 (After Pergande, U. S. Dep't Agric. Div. Ent. Tech. Ser. 9, > 



..got) generation [fig. 183] is produced 



and the life cycle of the species completed. This last develops rapidly, 

 attaining maturity in two or three weeks and deposits eggs as stated 



Fig. 184 Hamamelistes spinosus: rt=dorsal view of male ; <£=antenna ; r=dorsal view 

 of female; a'=antenna ; t— ventral-lateral secretory gland, much enlarged (After Per- 

 gande, U. S. Dept. Agric. Div. Ent. Tech. Ser. o, 1901) 



above. The general appearance of the full grown males and females is 

 shown at figure 184. 



