50 INSECTS AFFECTING STORED PRODUCTS. 
shouldered hickory beetle and the apple twig-borer ; “ ¢ represents the 
pupa, ventral view. The larva and pupa are white. 
Unfortunately, at the time that the illustration was drawn neither 
larva nor pupa was described, and the material preserved is not now 
in fit condition for a technical description. 
HISTORY AND LITERATURE. 
Dinoderus truncatus was described as a new species in 1878, from 
specimens accidentally found in California.!’ It was accidentally 
brought to this country with corn for exhibition in the Mexican sec- 
tion of the New Orleans Exposition in 1885. In 1898 the writer ob- 
tained specimens of this insect in corn and edible roots from the 
Mexican and Guatemalan exhibits at the World’s Columbian Exposi- 
tion, held in Chicago that year. ?* 4 In 1894 about half a peck of 
samples of Mexican corn 
that had been ruined by this 
insect was received in this 
department. The samples 
in both cases, as well as in 
many others that have come 
to the notice of the writer, 
were fairly reduced to pow- 
der. Inthe case of corn, the 
insects bore through and 
Fic. 9.—The larger grain-borer (Dinoderus trun- . 
catus) : a, Adult or beetle; b, larva; c, pupa; through the kernels, the cob, 
d, antenna. a, b, c, About six times natural and the husk, and where pa- 
size; d, highly magnified. (Original.) . 
per wrappings and labels are 
used they also perforate these. Since that time this insect has been 
received from other sources. 
December 3, 1902, Mr. A. L. Herrera, of the City of Mexico, sent a 
sample of stored corn from Tlaxiaco, State of Oaxaca, infested with 
this and other species of insects which are identified with injury 
of this nature in Central America. 
Specimens were also received, November 19, 1909, from Mr. G. C. 
Beckmann, Parral, Province of Chihuahua, with report that they, 
with Silvanus surinamensis L. and Tribolium confusum Duv., were 
injurious to the ears of maize. 
OFFICE EXPERIMENTS. 
Owing to the fact that it was known at the time of receipt of liv- 
ing specimens that the insect had not been introduced into the United 
States, only a limited number of experiments were made lest the 
4 Sinoxylon basilare Say and Amphicerus bicaudatus Say. 
