1914 ENTOMOLOGICAL SOCIETY. 19 



introduction of suitable parasites would be considered the proper solution of the 

 problem, and a campaign might be suggested similar to that being carried on at 

 present against the Gypsy and Brown-Tail Moths. Since the natural cheek is 

 already firmly established, care sliould be taken to assist, not to counteract it, by 

 the artificial means used to bring the pest under control. 



Until this season I have not been successful in breeding Saperda concolor. Lex., 

 from its galls, although I have collected swellings on the stems of poplar and 

 willow with the utmost confidence on several previous occasions. The galls from 

 which the beetles were finally secured occurred on the stems of Populus halsamifera, 

 L.. usually on small second-growth material. The swellings were ellipsoidal to 

 spherical in form, and averaged about 2 cm. in length, the width varying with 

 the size of the affected hranch. The tunnels of the larvse were on an average 

 15 mm. in length by 4 mm, in diameter and passed almost straight along the 

 centre of the stem. In external form the gall closely resembles that produced on 

 Populus tremuloides, Michx., by the Clear-wing Moth, Memythrus tricinctus, 

 Harris. The beetles emerged early in May. In the locality where found the galls 

 were abundant enough to seriously damage the smaller specimens of the host. 

 Judging from my experience with this beetle a number of the swellings on poplar 

 and willow commonly ascribed to it must derive their stimulus from other sources 

 probably bacterial or fungal in character. 



Another interesting gall not previously reported from this locality is that pro- 

 duced on various species of poplar by the moth Ectoedemia populella, Busck. I 

 collected this gall several years ago on Populus deltoides, Marsh., growing in the 

 ecanty soil of a small rocky island near Hutton House, Muskoka, but did not. 

 obtain it at Toronto until the present season. It is here found on Populus grandi- 

 dentata, Michx. The gall has not the spindle shape that we commonly associate 

 with the Lepidopterous type, but is nearly globular in form. It originates by a 

 swelling of the petiole of the leaf close to its junction with the blade. 



The following list includes all the other Lepidopterous gall producers, as far 

 as reported from this vicinity; 



Ecdytolopha insiticiana, Zeller. 



Host, Robinia pseudo-acacia, L. 



Eucosma scuddenana, Clemens. 



Hosts, Solidago cnnndensis, L. , 



" serotina, var. gigantea, Gray. 



Gnorimoschema gallaesolidaginis, Eiley. 

 Hosts, Solidago canadensis, L. 



" serotina, var. gigantea. Gray. 

 " rugosa. Mill. 



Gnorimoschema gallaeasterella, Kellicott. 

 Hosts, Solidago latifolia. L. 



"' caesia, var. axillaris, Gray. 



Memythrus tricinctus, Harris. ■ 



Host, Populus tremuloides, Michx. • > 



Stag inatophora ceanothiella, Cosens. . ; 



Host, Ceanothus americanus, L. 



