266 ENTOMOLOGICAL NEWS. [June, 'lO 



from eggs deposited in the twigs. Upon observing closely I 

 found several nymphs in the act of emerging from the eggs in 

 the bark. On the willow bark there was little or no protuber- 

 ence or blister to make the presence of the eggs known. In 

 fact, I could not have detected the eggs had not the nymphs 

 been emerging from them at the time. A single egg which had 

 not yet hatched I could detect through a slight crevice in the 

 bark. After a nymph had emerged from an egg in the bark 

 the hole appeared only as a natural opening. The eggs were 

 placed in last year's wood, so far as I could determine from 

 those which I saw hatching at the time. 



The nymphs were extremely abundant on the leaves and 

 twigs of the willow trees. When disturbed they would all 

 hurry down the main twig towards the trunk of the tree. They 

 were most active creatures in this respect. Nearly all of the 

 nymphs were of the first stage ; some few were older than that 

 stage. 



These nymphs were like those on the poplar, although they 

 averaged somewhat more pale in color. The older stages show- 

 ed plainly the brownish bars on the thorax, as did these nymphs 

 on poplar. 



Nymphs from the willow trees were brought to the insectary 

 and reared to maturity upon willow twigs. Adults were found 

 in the cages from May 30 to June 15. 



No hibernating adults of this species were found on poplar 

 or willow trees in the spring, and so I have no data to add in 

 that respect. 



Empoasca mali LeBaron. 



In Iowa the apple leaf hopper winters both in the adult and 

 in the egg stages. Hibernating adults have been found in the 

 southern part of the State, at Shenandoah, and also in the cen- 

 tral part, at Ames. The species also winters in the egg stage 

 in all parts of the State. So far as it is known, these eggs are 

 placed only in the bark of apple trees. 



These egg pouches appear as tiny blisters in the bark, barely 

 visible to the naked eye. They are more or less cylindrical in 



