16 



Two moved in fifteen minutes, one in thirty-five minutes, and the fourth 

 in seventy minutes. ~No. 5 showed no signs of life at this time and was 

 watched no longer. 



Larvae with corduroy were kept for many days under observation; 

 at temperatures of 37°, 39°, 40°, and 42° were absolutely motionless; 

 at 44°, 45°, 47°, and 48° were moving very slightly. Forty-eight 

 degrees was the highest temperature reached, and between April 24 

 and June 15 there had been no attack whatsoever on the goods. On the 

 latter date all larvas were removed to warm room, when 20 out of 50 

 revived. 



A parallel experiment on uncovered larvae showed practically the 

 same result. 



The black carpet beetle (Attagenuspiceus).— Adult, — The beetle 

 was found to move at 47° and was motionless at 42°. 



Larvce. — Larvre of this species, which is one of the principal house- 

 hold insects in the South, replacing there Anthrenus scrophularice, were 

 tested both with bits of carpet and in corn meal in which they were 

 found. At 38°, 39°, 40°, 42°, and 44° F. they were motionless. At 45° 

 those with meal were motionless, but one of those with cloth was seen 

 to move its legs and head slightly. At 47° and 48° both lots moved, 

 though very sluggishly. 



Of those kept with cloth at degrees varying from 38° to 48° from 

 May 6 to June 15 none revived after a "long time" in a warm room, 

 from whicli Dr. Read made a marginal note, "Don't seem to stand long- 

 continued cold as well as moth larvre." With those in the meal, how- 

 ever, the case was different. They were maintained from May 2 to 

 June 29 at a temperature ranging from 29° to 48°. On the latter date 

 they were removed to a warm room and only a few revived after 75 min- 

 utes, but next day all were active. 



The leather beetle {Dermestes vulpinus). — Larvae. — At temper- 

 atures of 36°, 38°, and 39J°, motionless; at 40°, 44°, and 45° there was 

 slight motion; at 47° and 48° they were active and feeding. 



The dark meal-worm (Tenebrio obscurus). — Larva. — At 36° to 

 42°, no movement. At 44° to 48°, slight and weak movements of legs. 

 Pupce. — Two pupse were kept in cold room at from 34° to 48° from May 2 

 to May 11; were then removed to warm room. One partially trans- 

 formed May 18, but died, and the other died May 25. This observation 

 has no significance, but is included as the only one made upon pupje 

 except with the following species: 



A cabinet beetle {Trogoderma tar sale). — Pupce. — Five pupaB have 

 been kept from May 2 to the date of writing (August 14) at a temper- 

 ature of from 34° to 44° without apparent change. 



Adults. — Ten beetles kept from May 2 to July 2 at a temperature of 

 from 34° to 44°. Three died during that time and all remained per- 

 fectly inactive without ovipositing. 



