MONOGRAPH OF THE GENUS SAPERDA 73 



1884 Harrington, W. H. Can. Ent. 16:102 (On balsam poplar in June, 



two sizes of larvae) 

 1890 Ent. Soc. Ont 20th Rep't, 1889, p. 52 (Produces galls in 



poplar) 



1890 Packard, A. S. U. S. Ent. Com. 5th Rep't, p.436 (Attacks poplar 



and balm of Gilead, larva described) 



1891 Beutenmuller, William. N. Y. Micro. Soc. Jour, 7:31 (Bibliography 



of transformations) 



1892 Kellicott, D. S. Can, Ent. 24:209 (Bred Sciapteron tricincta 



from enlargements inPopulus candicans and willow) 

 1896 Beutenmuller, William. N. Y. Ent. Soc. Jour. 4:80 (In smaller 



branches of poplar and willow) 

 1896 Leng, C. W. & Hamilton, John. Am. Ent. Soc. Trans. 23:147, 151 



(Systematic account) 



1898 Wickham, H. F. Can. Ent. 30:42 (Specific characters, food plants) 



1899 Smith, J. B. Cat. Ins. N. J. State Bd Agric. Rep't, sup. p.297 (Staten 



Island, in willow) 



1900 Felt, E. P. State Ent. 15th Rep't. N. Y. State Mus. Bui. 31, 6:556 



(Bred from Populus balsamifera May 26) 



Saperda concolor Lee. 



. This species, which requires but one year to complete its trans- 

 formations, so far as our observations go, girdles the trunks of 

 sapling poplars by running a mine around them, which causes a 

 swelling often nearly twice the size of the diameter of the tree, as 

 described by Dr Packard. It infests dwarf willow canes as stated by 

 Dr Hamilton ; and the following is from his account of the insect. 



Life history. The beetles appear from the last week in May 

 till after the middle of June. The smaller canes, 14. to ^A inch in 

 diameter, of Salix longifolia growing along water 

 courses are usually selected by this insect for breeding places. 

 The beetle gnaws a longitudinal incision through the bark, about 

 ^A inch in length, and deposits an egg in each end. Several are 

 usually made in the same cane some distance apart and these 

 often cause its death the following year. A warty, gnarly swell- 

 ing occurs around each incision [pi. 6, fig. 14]. The 3^oung 

 larvae [pi. 6, fig. 12, 13] follow the same course as those of 

 S. f a y i , only they burrow deeper into the woo there are 



no supernumeraries, as there is no need of them, 'siiic«6'' the w^ood 

 of the willow dies much more quickly than that of Crataegus. 



