4 * BULLETIN 571, U. S. DEPARTMENT OF AGRICULTURE. 
H. M. Russell reported this species as reared from pecan on May 
18 and 20, 1908, at Orlando, Fla. (Chittenden No. 348), and D. K. 
McMillan, at one time connected with the bureau, recorded it on May 
25, 1908, from pecan at Brownsville, Tex. (Chittenden No. 1045). 
The material on which Riley based his description was probably 
collected in Missouri, and the material on which Hulst (3) described 
this insect under the name Acrobasis albocapitella was taken in Canada 
(Ontario). Fiske (9) reported it from Georgia, Gossard (12) from 
Florida, and Herrick (14) from Texas (Cuero and College Station). 
The writer has seen it occurring in injurious numbers on pecan in 
Florida, Georgia, Alabama, Mississippi, Louisiana, and Texas. It 
has been reported to be injurious in South Carolina, and it is also 
known to occur in North Carolina and Virginia, but in these States 
apparently it does only minor damage. So far as is known, this in- 
sect ranks as a serious pest only in the southern part of the pecan- 
growing area, but from the foregoing records it can be seen that 
the species is quite widely distributed over this country. 
FOOD PLANTS. 
In his original description, Riley (1) gave wild crab (Crataegus sp.) 
as the food plant from which a single specimen was reared. Dr. 
Dyar (13) made the following statement: "I have 23 specimens 
before me, 4 bred by Dr. Riley on hickory and walnut, including 
the type of nebuleUa" and he also gave numerous records of its 
occurrence on pecan. Dr. Dyar (13) also gave a record made by 
Mr. August Busck in which this insect was reared from walnut on 
June 7, 1913, at Washington, D. C, and Mr. M. M. High (14) found 
it on wild hickory near College Station, Tex. Gossard (12) reared 
it in abundance from the pecan in Florida, and Herrick (14) states 
that he " reared many specimens from pecan at Cuero, Tex., where 
it was very abundant and doing serious damage." There are also 
many other records of this species occurring on pecan. So far as 
the writer's experience goes, the larvae have been observed feeding 
upon hickory, Japanese walnut, and pecan, and moths have been 
reared from material collected on pecan and hickory. The writer 
has not yet found the black walnut to be attacked, although not 
infrequently that species has been found growing in close proximity 
to badly infested pecan trees. According to the writer's observation 
and experience it is very difficult to find larvae on various species of 
Hicoria other than H. pecan, even in sections where this species ranks 
as a pest in pecan orchards. This species shows a decided preference 
for the pecan, and in many sections of the South it is the most 
injurious insect affecting the culture of this nut. 
In making observations in pecan orchards in localities where tliis 
insect occurred in injurious numbers, an apparent varietal resistance 
