June, '17] BURKE: NOTES ON WESTERN BUPRESTIDAE 331 



<;ycle; may damage ornamental shrubs and shade trees. Some tax- 

 onomists consider this the same as the preceding species but the Ufe- 

 history and habits indicates that it is distinct. 



Agrilus niveiventris Horn — California; mines inner bark and wood 

 of normal and dying trees; lombardy poplar {Populus nigra italica); 

 flies from May to August; feeds on the foliage of the willow {Salix 

 lasiandra and S. lasiolepis) and the host plant; lays its eggs singly in 

 crevices in the bark; girdles and kills shade trees, sometimes causing 

 severe damage. 



Agrilus granulatus Say — Colorado and Montana; mines inner bark 

 and wood of normal, dying and dead trees; willow (Salix sp.), black 

 Cottonwood (Populus trichocarpa) and common cottonwood (P. del- 

 toides); girdles and kills limbs and trunk. Injurious to shade trees 

 in Colorado. 



Agrilus anxius Gory — South Dakota, Montana, Colorado, Idaho 

 and Utah; mines inner bark and wood of normal, dying and dead trees; 

 aspen (Populus tremuloides) , common cottonwood (P. deltoides) and 

 mountain birch (Betula fontinalis); flies from May to August; girdles 

 and kills branches and trunk; causes severe damage to shade trees. 



Agrilus acutipennis Mann. — Colorado; mines inner bark and wood 

 of normal, injured and dying trees; gambel oak (Quercus gamhelii); 

 flies from June to August; feeds on the foliage of the host plant; lays 

 its eggs in the crevices of the bark; girdles and kills branches and 

 trunk; very destructive to native groves of oak in Colorado according 

 to Mr. George Hofer. 



Agrilus politus Say — Montana, Colorado, Oregon and California; 

 mines inner bark and wood of normal, injured and dying trees and 

 shrubs; mountain willow (Salix monticola), nuttall willow (S. nuttallii), 

 arroj'o willow (S. lasiolepis), weeping willow (S. hahylonica), mountain 

 alder (Alnus tenuifolia) and dwarf maple (Acer glabrujn) ; flies from May 

 to August; feeds on foliage of host plant; lays its eggs in masses of from 

 one to twelve on the smooth bark of branches and trunk; girdles and 

 kills branches and main trunk; life cycle appears to vary; Mr. Josef 

 Brunner considers it to be two years in Montana but it seems to be 

 only one in some parts of California ; very destructive to alder in some 

 parts of Montana and to willow in California; attacks weeping willow 

 shade trees. There may be several species still mixed under this name. 

 In practically all of our rearings greenish specimens occasionally appear. 

 These have been identified by Mr. W. S. Fisher as Agrilus solitarius 

 G. & H. The next species which is dark blue has also been considered 

 a variety of politus but the life history and habits indicate that it is 

 distinct. 



Agrilus sp. — Oregon and California; mines inner bark and wood of 



