INJURIOUS INSECTS OF 1909 AND 1910 
BY F. L. WASHBURN. 
CUTWORMS. 
EXPLANATION OF PLATE: 
Figs. 1 and 2—Wheat-Head Army Worm, H. diffusa, Walk., much enlarged, 
and showing variations in color. 
Fig. 3—Moth of the same. 
Figs. 4, 5, 6 and 7—Different Cutworms, collected in the vicinity of St. 
Anthony Park; died before reaching maturity, hence not identified. 
Figs. 8, 9 and 15—Caterpillar, Moth and Pupa of Hadena devastatriz. 
Figs. 10 and 11—The Zebra Caterpillar, or Painted Mamestra and its moth, 
Mamestra picta Harris. 
Figs. 12, 13 and 14—Larva, Moth and Pupa of the Cutworm known as the 
Subgothie Dart, Feltia jaculifera. 
We are indebted to Dr. J. B. Smith for identification of the 
above imagoes. Riley’s account of H. alblinea probably applies to 
H. diffusa, the latter being commonly regarded as albilinea and was 
so figured by Riley. 
Cutworms, represented here by several species, have been so 
extremely troublesome in Ig1to, that we have made them the 
subject of a colored plate in this report, including also the Wheat- 
Head army worm, Heliophila diffusa, Walk, which has been locally 
very destructive, and also the Zebra caterpillar Mamestra picta, and 
its moth; which, while not a cutworm in the strictest sense, belongs 
to the same family, Noctuidae. 
The abundance of cutworms this year may have been due, in a 
measure, to the cold weather cutting down the weed growth which 
started in the abnormally warm weather of the early spring of IgIo, 
obliging them to turn their attention more completely to cultivated 
crops. Complaints of cutworm injury began to reach us in May of 
the present year, and a few letters were received as late as August. 
There were more than twice as many complaints in 1910 as in the 
preceding year, and among the localities affected were Brainerd, 
