380 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 13 
Doane mentioned the work on the live oak in 1912 without naming the 
species. (Jour. Econ. Ent., Vol. 5, p. 347.) Childs, in 1914, gave a 
very good account of the insect and its work under the name of Agrilus 
politus Say. (Month. Bui. Cal. State Com. Hort., Vol. Ill, pp. 
150-5.) He also figured the insect and its work and recommended 
methods of control. Essig, in 1915, figured the insect and gave a short 
account of the life history, work, distribution, food plants, control and 
natural enemies under the name Agrilus politus. (Injurious and Bene¬ 
ficial Insects of California, p. 234.) In January, 1917, Burke figured 
the eggs as those of Agrilus angelicus (U. S. Dept. Agric., Bui. 437, 
fig. I, PI. IX) and in June of the same year gave a short account of the 
species under the same name. (Jour. Econ. Ent., Vol. 10, p. 330.) 
Specimens have been sent to the leading specialists on the genus 
Agrilus and there seems no doubt but that the species is angelicus 
Horn. It is quite distinct from politus Say. A very similar species 
which has been identified as angelicus by some of the specialists lives 
in the manzanita ( Arctostaphylos species) and the madrone ( Arbutus 
menziesii ) in the Sierras and coast valleys of Central California. 
There are some differences in the life history which cause the writer to 
believe that it is distinct. Experiments are now being carried on 
which should settle this point. 
Distribution and Food Plants 
The specimens from which the species was named came from near 
Los Angeles and from the Santa Cruz Mountains, California. Childs 
obtained his specimens at Palo Alto from the live oak. Essig says 
that the insect is found throughout the state of California, that the 
favorite host is the willow, that the live oak often is severely damaged 
by its attacks and that other food plants are the buckeye and hazel¬ 
nut. He undoubtedly used the distribution and food plants of A. 
politus, under which name he accounts for the species. 
The writer has reared specimens of the beetle from live oak twigs 
collected at Pasadena by Dr. A. G. Smith, and at Palo Alto, Los Gatos, 
Laurel and near Saratoga, Calif., by himself. Larvae and the charac¬ 
teristic work have been found at Boulder Creek, San Juan, Monterey, 
Carmel, Woodside, Niles, Alum Rock, Napa and Mt. St. Helena, by 
Mr. R. D. Hartman. Mr. F. B. Herbert found the work very common 
at Montecito near Santa Barbara and at South Pasadena. During 
the past summer heavy infestations were found in the black oak and 
canyon live oak near Confidence, Tuolumne County, in the middle 
Sierras. 
The following host plants have been determined: California live 
oak ( Q . agrifolia), interior live oak ( Q . wislizeni), leather oak (Q. 
