The B ology of AIaine Species of Altica. 171 



on the panicled dogwood, C. paniculata L'Her. In Connecticut 

 he has found them more frequently on the latter species. 



Food plant tests. A large number of tests was carried out 

 to determine the possible range of food plants. In these and all 

 other food tests recorded in this paper, the experiments were 

 made as follows : 6 larvae or adults were kept in a clean shell 

 vial without food for 24 hours ; then an uninjured leaf of the 

 plant to be tested was introduced, and the insects were left un- 

 disturbed for a second 24 hours ; at the end of that time the leaves 

 were examined, and a record made as to whether they had been 

 considerably eaten, slightly eaten, or left untouched. 



The complete list of food plants used in these experiments 

 is given below. The sequence of plant families and the form 

 of the scientific name follows the use of the latest edition of 

 Gray's Manual. 



Family Gramineae, grass family : cofn, Zea mays L. 



Family Salicaceae, willow family: cultivated willow. Salix near nigra 

 Marsh ; heart-leaved willow, Salix cordata Muhl. ; petiolate willow, 

 Salix petiolaris Sm. ; beaked willow, Salix rostrata Richards ; aspen 

 poplar, Populus tremuloides L. ; balsam poplar, Popuhis balsamifcra L. ; 

 Cottonwood, Populus dcltoidcs Marsh. 



Family Myriaceae, gale family: sweet fern, Myrica asplenifolia L. 



Famiy Betulaceae, birch family: hazel, Corylus rcstrata Ait.; 

 gray birch, Betula populifolia Marsh; alder, Alnus incana (L.) Moench. 



Family Fagaceae, oak family : red oak, Quercus rubra L. 



Family Urticaceae, nettle family : red elm, Ulmus fulva Michx. ; 

 white elm, Ulmus americana L. 



Family Saxif ragaceae, saxifrage family : syringa, Philadelphus 

 coronarius L. ; smooth gooseberry, Ribes oxycanihoides L. ; European 

 gooseberry, Ribes Grossularia L. ; red currant, Ribcs vulgare L. 



Family Rosaceae, rose family: cultivated spiraea, Spiraea sp. ; 

 apple, Pyrus Malus L. ; mountain ash, Pyrus americana (Marsh) DC; 

 shad bush, Amelanchier oblongifolia (T & G) Roem. ; hawthorn, Cra- 

 taegus sp. ; wild strawberry, Fragaria virginiana Duchesne. ; cultivated 

 strawberry, Fragaria sp. ; wild rose, Rosa virginiana L. : cultivated rose, 

 Rosa sp. ; Japanese rose, Rosa Yvara; choke cherry, Prunus virginiana 

 L. ; wild red cherry, Prunus pennsylvanica, L. f. ; wild plum, Prunus 

 nigra Ait.; cultivated plum, Prunus domestica L. 



Family Leguminosae, pea family: cultivated bean, Phaseohts sp. 



Family Aceridae, maple family: sugar maple, Acer saccharum Marsh. 



Family Vitaceae, grape family : grape, Vitis sp. ; wood-bine, Psedera 

 quinqucfolia (L.) Greene. 



Family Tiliaceae, basswood family: basswood, Tilia americana L. 



