207 



cankered, while some Lombardv poplars in an adjacent block not 

 attacked by this weevil were free from the disease. Incipient 

 cankers were found also in the wounds made by the egg-punctures 

 of the buffalo tree-hopper [Ceresa huhalus). 



Hayes (W. P.). Studies on the Life-history of Two Kansas Scara- 

 baeidae (Coleop.). — Jl- Econ. Entom., Concord, N.H.. xi, no. 1, 

 February .1918, p. 136. 



CyclocepJiala villosa, Burm., has a hfe-cycle occupying one year and 

 is one of the many injurious white- grubs belonging to this genus. 

 Adults are attracted to lights and may be found in June, July and 

 early August. Eggs are laid in the soil and hatch in from 9 to 25 

 days. The winter is passed in the larval stage, which averages 347 

 days. The pupal stage varies from 8 to 24 days. 



Anomala hinotata, Gyll., is injurious in the adult stage to fruit- 

 producing plants, and the grubs are minor pests of maize, wheat, and 

 oats. Winter is passed in the adult stage. Eggs are laid in the spring 

 and soon hatch, the larvae requiring some 83 days for their develop- 

 ment. The pupal stage lasts on an average 16 days. Transformation 

 to the adult stage takes place in the autumn, the adults remaining 

 in the pupal cells until the following spring, thus completing a one-year 

 life-cycle. 



Lathrop (F. H.). Notes on Three Species of Apple Leaf-hoppers.— JZ. 

 Econ. Entom., Concord, N.H.. xi, no. 1, February 1918, 

 pp. 144-148, 1 fig. 



The apple leaf-hoppers, Empoasca mali, Le B., E. unicolor. Gill., 

 and Empoa rosae, L., are very similar in appearance. Their distin- 

 guishing characteristics are dealt ^yith in this paper. 



Empoa rosae hibernates in the egg-stage, most of the eggs being 

 deposited in the bark of the rose, or sometimes on apple. The nymphs 

 feed on the under-side of the leaves. Adults begin to appear during 

 the second week of June and migrate to apple, where they are found 

 until late in July. Nymphs of the second generation, hatching from 

 eggs deposited on apple, appear in mid-July and become adults in 

 early August. In early October the adults return to the rose, on 

 which the winter eggs are deposited. 



Empoasca tnali hibernates in the adult form, the nymphs of the 

 first generation appearing during the last ten days in June. By mid- 

 July these have become adults, and at the end of the month second 

 generation nymphs appear, many of these maturing in September and 

 remaining on the trees in all stages until frost clears off the last nymphs. 

 These late nymphs may be a third generation from the earliest of the 

 second generation adults. This species feeds almost exclusively on 

 the tender terminal growth, causing severe curling of the leaves. 



Empoasca unicolor hibernates in the egg-stage, nymphs occurring 

 during the last week in May. Adults have not been observed before 

 early July. There is but one generation in a year, the adults oviposi- 

 ting in autumn in the bark of apple, for preference on young trees. 



Experiments to determine the possibility of the transmission of 

 fire-blight {Bacillus amylovorus] by these species proved negative. 



