592 



AMERICAN FORESTRY 



largely practiced by fish-culturists in England at least 

 this was the case in earlier times, and it is fair to pre- 

 sume that it is still maintained. 



Trout vary greatly within the species, according to the 

 nature of the waters they inhabit, the variations being 



teen pounds, while as a rule they do not run over three 

 or four pounds. 



Through the energies of the U. S. Bureau of Fisheries 

 and similar establishments under the control of several 

 of the States, many of our inland waters are kept abund- 



THE BROOK TROUT 



figure 13. There is quite a long list of Trout that inhabit the streams and lakes of the United States; but among them all, no greater favorite 

 thas the Brook Trout. Brook Trout have often been kept in the aquaria of the United States Fish Commission at Washington, and here is 

 a beautiful specimen of one photographed there by the writer. 



manifested in their color, size, form, and fin-development. 

 As to their weight, Mr. Hallock, a famous American fish- 

 erman, claims to have known of one that weighed seyen- 



antly stocked with this valuable game fish as they are, as 

 a rule, captured by anglers everywhere, although by no 

 means a regular fish of the markets. 



BEWARE OF THE EUROPEAN SATIN MOTH 



A N insect not heretofore reported in the United States 

 has been found at the Medford and Maiden line 

 by the employes of the Metropolitan Park Commission. 

 This insect is known as Stilpnotia salicis, or the Satin 

 Moth of Europe. This name was undoubtedly given 

 because the moths are pure white and the wings have 

 a satin-like lustre. 



Specimens of the caterpillars of this insect were 

 brought to the Gipsy Moth Laboratory by Mr. A. N. 

 Hubberly, Superintendent of the Middlesex Fells Reser- 

 vation, with the statement that they were feeding heavily 

 on poplar trees along the parkway. The insect was ap- 

 parently not a native species, and proved to be the 

 European species above mentioned. The center of the 

 infestation is in the triangle at the Maiden and Medford 

 line bounded by Pleasant Street and Fellsway East and 

 West. The trees in the Fellsway have been sprayed 

 recently, but the caterpillars are now full-grown and 

 many of them are entering the pupal stage. The full- 

 grown caterpillars are about an inch and a half in length 

 and of a yellowish color with prominent white blotches 

 on each segment of the back, which makes them very 

 conspicuous on account of the colors, and they are quite 



different from any caterpillars that are found in this 

 region. The injury to the trees is caused by defoliation 

 by the caterpillar and the amount of damage likely to 

 occur cannot be accurately measured at this time, as no 

 areas are now heavily infested, though the insect was 

 found in thirty towns north of Boston during a three- 

 week period. 



European writings indicate that this species attacks 

 poplar, willow, oak and other trees and that it occurs 

 in the British Isles, Italy, Spain, Germany, Southern 

 Europe and Eastern Asia. The poplars have been eaten 

 more freely than any other trees in the Medford infes- 

 tation. There is danger, however, that this insect might 

 seriously attack other valuable shade or forest trees if 

 it becomes firmly established. The moths fly well and 

 immediate efforts are being made by the Metropolitan 

 Park Commission and the State Forester's Office to 

 destroy as many of the caterpillars and pupae as possi- 

 ble, so as to prevent large numbers of moths emerging 

 and heavy migration to adjoining territory. 



The United States Bureau of Entomology will make 

 a study of the life-history and habits of the moth and an 

 attempt to determine the extent of the infestation. 



