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SATIN MOTH 1 
During 1931 .the satin moth ( Stilpnotia salicis I.)-. was found in new 
localities in the following -count ie's and quarantine regulations were 
modified to cover the additional areas: Piscataquis, Somerset, and Franklin 
Counties, Me.; Orange Cotuity, Vt. ; Berkshire and Franklin Counties, Mass.; 
and Hartford, Litchfield, Hew Haven, and Fairfield Counties, Conn. 
TENT CATERPILLARS 
The forest tent caterpillar ( Malacosoma disstria Hbn. ) was generally 
reported from the New England and the northern Middle Atlantic States as 
very scarce. Late in April the insect was active and abundant in the Gulf 
region in Alabama and Louisiana. In Lo^^isiana, after defoliating the sweet 
gum and willow, it attacked oak and wild blackberries and also inflicted 
considerable injury to strawberries by eating the flowers. During May, in 
Virginia, several hundred acres of forest land in Fluvanna County were 
completely defoliated; a similar outbreak occurred in Buckingham County, 
These were said to be the worst outbreaks ever experienced in that State 1 . 
From June 10 to 20 the moths of these caterpillars were so numerous in the 
streets of Lynchbu.rg and Roanoke, Va. , that merchants were forced to turn 
out their window lights. Adults were observed early in May in large numbers 
at Orlando, Fla. During June there was some defoliation reported from 
Hancock County, Me. The eastern tent caterpillar ( Malacosoma americana Fab. ) 
on the whole was not abnormally numerous this year throughout the New England, 
Middlfe Atlantic, and South Atlantic States. On the other hand, reports of 
unusual numbers of this insect were received from Arkansas and Texas. 
During the late spring there were reports of some defoliation, especially 
of wild black cherry, in southern Maine, and it was also recorded as abundant 
in restricted localities in the other New England States. The California 
tent caterpillar (M. californicus Pack. ) was extremely prevalent in late 
March a.rou.nd Phoenix^ Ariz., where it -was defoliating cottonwoods and 
severely injuring apricot foliage. 
"The western tent caterpillar ( Malacosoma pluvial is Dyar.) was again 
abundant on alder, poplars and willow along the coast of Oregon and the 
Columbia River. However, defoliation of these trees was not so severe as 
last year and only a few places showed trees completely stripped." 3. 
SADDLED PROMINENT 
Adults of the saddled prominent ( Heterocampa guttivitta Walk.) issued 
in the New England area during May end early June. Eggs hatched in the 
Berkshire Hills of Massachusetts on June 10 and in the White Mountains of 
New Hampshire on June 16. This insect, which was at the peak of its 
abundance in 1930, is still quite numerous throughout western Massachusetts, 
southern Vermont, and New Hampshire. The greater part of the defoliation 
was confined to maple and beech. 
1 Plc?„nt Quarantine and Control Administration, U. S. D. A. 
2 Forest Insect Investigations, Bureau of Entomology, U. S. D. A. 
