-99- 
Tribolium castaneum (Hbst.), the red flour beetle 
Same as the first test of Sitophilus oryza .— Cotton et al. ( 120 ) . 
Trlbolium oonfustnri Duv., the confused flour beetle 
Same as the first and s eoond tests of Sitophilus oryza . In a third 
test, garden seeds in paper envelopes were treated with 0.65 percent of 
DDT, repackaged, and placed with untreated lots in a special cabinet. 
After 2 months the treated seeds were undamaged while the untreated seeds 
were heavily infested. In a fourth test, spraying with odorless kerosene 
containing 5 peroent of DDT cleaned up an infestation in a wallboard 
partition of a flour-storage room. In a fifth test, kraft bags were treat- 
ed in three ways— by dipping in a 10-percent solution of DDT in acetone, 
by painting one side with varnish containing 10 percent of DDT, and by 
coating one side with a clay coating liquor containing 10 percent of DDT. 
The bags were filled with flour, tightly sealed and exposed to a heavy 
infestation of flour beetles. All the treated bags resisted penetration 
by these insects for many months, whereas bags made of untreated kraft 
paper were usually penetrated within a few days. In a sixth test, ordi- 
nary ootton flour bags and No. 5 kraft paper bags were treated with 5 
percent of DDT in carbon tetrachloride. Considerable resistance to 
beetle attack was imparted to both types of bags by impregnation with 
DDT. --Cotton et _al. (120 ) . 
A DDT dust mixed with wheat 1 to 15,000 was effective.— Smallman 
(522). 
Within 5 minutes after 100 adults in a box about 18 inches square 
were sprayed with a 5-percent UPT solution all were dead or incapacitated. 
Another 100 adults put in the same sprayed box 24 hours later were soon 
killed by the residue. In a similar box sprayed and allowed to stand 
for 30 days before 100 beetles were introduced, 24 hours were required 
before the insects succumbed. In other tests the beetles were killed 
only in the adult stage and DDT was not effective against the eggs, lar- 
vae, and pupae .--Davis (129 , 130 ) . 
Almicide dust containing 18 percent of DDT when mixed with wheat 
1:15,000 killed 90 peroent of confused flour beetles within 10 days.— 
Ross (306 ). 
Miscellaneous Coleoptera . 
Examination of the ground under hairy vetch at Oregon City, Oreg., 
disclosed that 5-percent DDT dust had killed insects of several species, 
including many beetles (nitidulids, carabids, silphids, elaterids, 
cocoinellids, and Diabrotica 11 -punctata Mann.), flea beetles, weevils 
(Sitona sp. and Brachyrhinu3 sp.), and pea weevils. Coccinellid larvae, 
which were abundant, appeared to be unaffeoted. Some of these insects. 
