1040 
Journal of Agricultural Research 
Vol. XXXI, No. 11 
Attagenus piceus , and all larvae of A. piceus and Dermestes vulpinus , 
70 per cent of the larvae of Ephestia Tcuehniella and 80 per cent of the 
larvae of Plodia interpunctella. Larvae of Tenebrio obscurus , Tineola 
biselliella, Tinea pellionella, and Trogoderma tarsale were apparently 
not affected. Exposure for 24 hours to this vacuum killed ail adults, 
pupae, and larvae except 50 per cent of the larvae of Trogoderma 
tarsale. Eggs of none of the species were to be had except of Tineola 
biselliella, and of these only 10 per cent were killed. 
A vacuum of 26 to 29 inches in the glass bell jar, with the tempera¬ 
ture ranging from 60° to 70° F., and the barometer from 29.3 to 29.7 
inches, maintained for four days, killed all adults of Alphitobius 
S 'ceus, Anthrenus fasciatus, Attagenus piceus, Cryptolestes pusillus, 
ermestes vulpinus, Ephestia Tcuehniella, Necrobia rufipes, Oryzae- 
philus surinamensis, Plodia interpunctella, Silvanus gemellatus, Sito- 
philus oryza, S. granarius , Tenebrio obscurus, Tenebroides mauritani- 
cus, Tineola biselliella, Tribolium confusum, T. ferrugineum , and Tro¬ 
goderma tarsale. It killed all pupae used in the experiment, including 
those of Anthrenus fasciatus, Attagenus piceus, Qryptolestes pusillus, 
Dermestes vulpinus, Ephestia Tcuehniella, Plodia interpunctella, Sil¬ 
vanus gemellatus, Tineola biselliella, Tribolium confusum, T. ferrugi¬ 
neum, and Trogoderma tarsale. All larvae of the 18 species above 
mentioned except Necrobia and Sitophilus (which were not included 
in the experiment) and the larvae of Tinea pellionella were killed, 
and all the eggs of Tineola biselliella. Eggs of this species were 
the only eggs available for experimental purposes. 
Exposure of two days to the 26 to 29 inch vacuum killed all forms 
included in the experiments except 80 per cent of the larvae 
of Trogoderma tarsale and 60 per cent of the eggs of Tineola biselli- 
etta. Exposure for only one day killed a large proportion of the 
forms included except 50 per cent of the adults of Tenebroides mauri- 
tanicus , 50 per cent of the larvae of Anthrenus fasciatus, Attagenus 
piceus , and Tineola biselliella , 40 per cent of the larvae of Tinea 
pellionella , 80 per cent of the larvae of Tenebroides mauritanicus, 
none of Trogoderma tarsale , and only 10 per cent of the eggs of 
Tineola biselliella. 
A vacuum of 24 to 28 inches, maintained in a concrete vault 8 by 
8 by 8 feet, when the temperature varied between 60° and 70° F., 
and the barometer readings were between 29.3 and 29.7 inches, gave 
results which indicate that the usual fabric pests troublesome in 
storage warehouses can be killed by the vacuum treatment. Eggs, 
larvae, pupae, and adults of the common or webbing clothes moth, 
Tineola biselliella , were dead at the end of exposures of 3, 4, 5, 6, 
and 7 days. All pupae and adults of the carpet beetles Attagenus 
piceus and Anthrenus fasciatus were dead at the end of the same 
exposures. Ninety-two per cent of the larvae of Anthrenus fasciatus 
were killed by the end of an exposure of 3 days, and all after 4, 5, 6, 
and 7 days. The larvae of Attagenus piceus were most resistant; 
only 66 per cent being killed by an exposure of 3 days, 78 per cent 
by exposures of 4 and 5 days, 80 per cent by an exposure of 6 days, 
and 95 per cent by an exposure of 7 days. Oryzaephilus surinamensis 
was the most resistant of all species tested in the adult stage, 50, 65, 
75, 90, and 100 per cent being killed by exposures of 3, 4, 5, 6, and 
7 days, respectively. The larvae of Attagenus piceus, Tenebrio 
