12 BULLETIN 737, U, S. DEPARTMENT OF AGRICULTURE. 
Tt is stated that the method was in use throughout Brazil and that 
unusually good results had been obtained. 
During the same year (1910) Mr. A. C. Morgan, of the Bureau of 
Entomology, in an article on insect enemies of tobacco in the United 
States (70), briefly described methods of treatment with fumigants. 
It was stated that no method entirely satisfactory had been found 
for the treatment of baled tobacco. The results of experiments with 
Rontgen or X rays in the treatment of infested tobacco, conducted 
by Mr. A. C. Morgan and the writer, were published in 1913 (76). 
From Manila, P. I., in 1913, Mr. Charles R: Jones (77) published 
the most comprehensive article on the tobacco beetle which had yet 
appeared. ‘The life history and seasonal history of the insect in the ~ 
Philippines were determined and many practical methods of control 
tested under cigar-factory conditions. An exhaustive series of tests 
with hydrocyvanic-acid gas showed this fumigant to be effective in 
treating infested cigars without affecting their quality. 
Storage of infested tobacco at low temperatures is recommended 
by Mr. D. T. Fullaway (79) in a publication of the Hawai Agri- 
cultural Experiment Station in 1914. In 1916 the results of experi- 
ments with Rontgen or X rays on different stages of the beetle were 
published by the writer (86). In 1917 the writer (89) published a 
general account of the species, its life and habits, and methods of 
control. : : 
In the historical sketch given only the more important publica- 
tions relating to the life history of the insect or to the measures em- 
ployed in its control have been cited. In the bibliography (p. 69-77) 
reference will be found to most of the papers, relating to the insect, 
which have been published in permanent form. <A synopsis is given 
of the contents of the more important publications. 
DESCRIPTION OF STAGES. 
THE EGG. ? 
(Pl. I, fig. 8.) 
Keg about 0.45 mm. (0.44-0:46 mm.) long and 0.2 (0.19-0.21 mm.) in diameter; 
ovoid elliptical, pearly white, becoming more opaque and dull in color just before 
hatching. Surface smooth, without reticulation or sculpture except a portion at 
the end from which the larva emerges, which is covered with numerous papille. 
THE LARVA.1 
(P1. I, figs. 1—7.)? 
GENERAL CHARACTERS. 
Ventral side of epicranium not continued behind the posterior end of hypos- 
toma and. its tentorial pits; gula transverse, laterally attached to the posterior 
1In order that the identification in the field may be as accurate as possible it is neces- 
sary from time to time to incorporate in an economic bulletin technical descriptions. 
These descriptions are drawn up after extremely careful study of the anatomy of the 
larva by a specialist on the group. The following descriptions, kindly prepared by Dr. 
Adam G. Boving, will be of great assistance in future studies of ptinid larve. First is 
presented a description of the characters common to many ptinid larve, then the charac- 
teristics of the genus, and finally the specific characters of Lasioderma serricorne. 
? Description of larva (with Pl. I, figs. 2-7) made by Dr. Adam G. Béving. 
