36 INSECTS AFFECTING STORED PRODUCTS. 
ocelli reddish-brown, arranged in a triangle, mouthparts brownish, 
antennae very short, the head beset with a few long hairs; legs toler- 
ably long, slightly yellowish, with long claws. Each of the abdomi- 
nal segments bears ventrally a number of long hairs, and similar hairs 
are also on the dorsal side of the segments 7 and 8. The last segment 
bears a slightly curved, yellow horn, directed backward. Length a 
little less than 0.3 mm. 
The fully developed larva. — The larva when fully developed is 
of the characteristic bostrychine form similar to that of Dinoderus 
trancatus, shown at b of figure 9. It is rather more elongate than usual 
in the Ptinida?, and more constricted at the middle. The ground 
color is white, the head is light brown, and the mandibles dark 
brown, nearly black. The claws of the legs are light brown. The 
body is covered with minute, slender, pale-brownish hairs, which are 
denser and somewhat longer on the first thoracic and last two ab- 
dominal segments. 
The larva? when lying on their sides resemble somewhat, on a 
smaller scale, those of the lamellicorns, the body being curved in the 
same manner. Locomotion in this position is possible, but very slow. 
Full-grown larva? measured about 2.8 mm. in length. 
Examination of the pellets of excrement made by the beetles shows 
a somewhat remarkable method of deposition. The pellets are placed 
in strings of from two to six and sometimes more. 
The exact time consumed by this species in its development has 
not been ascertained to the writer's knowledge. From a lot of fresh 
corn in which eggs were deposited April 27, however, several beetles 
were observed August 12. 
EXPERIMENTS WITH REMEDIES. 
For a long tiime the writer has desired that a series of experiments 
be conducted with the standard fumigants, to ascertain if this species 
is in any degree more, or less, resistant than other insects which in- 
jure stored products, such as the grain weevils, the grain beetles, 
flour beetles, and others. Opportunity for experiments with hydro- 
cyanic-acid gas was offered in December, 1910, at Beaumont, Tex.. 
Avhere Mr. M. M. High, an agent of this bureau, working under the 
writer's special direction, conducted a series of experiments. Coinci- 
dent with these experiments another series of experiments with bisul- 
phid of carbon was being carried out in the Department of Agri- 
culture. A still longer series of experiments was also carried on by 
Mr. D. K. McMillan, at Houston and Beaumont, Tex., both with 
hydrocyanic-acid gas and with bisulphid of carbon under various 
conditions and strengths. 
