1912] Life History of Trogoderma Tarsale 381 
three of the groups many of the specimens which were less than 
half grown, or 3 mm. in length, at the beginning of the experi- 
ment, had reduced within about six or seven months to the 
minimum size of 1 mm. in length. Many of the full grown 
larvee which were 7 mm. in length have fallen back to less than 
half this size within one year of starvation; others decrease less 
rapidly, some having lost only 2 mm. during the same long 
time. The larve under the constant electric light had a some- 
what higher temperature and decreased more rapidly than did 
those of either of the other two groups; Even some of the full 
grown larve of this group had actually reduced their size 
within eleven months to practically the same measurements 
they had upon hatching, about 1 mm., and then finally died. 
The results of these experiments will be published in detail as 
soon as they are completed. 
I wish to express my thanks to Prof. William S. Marshall 
for his suggestions and kind criticisms in preparing this paper. 
Zoological Laboratory, Univ. of Wisconsin, 
October 15, 1912. 
REFERENCES. 
Chittenden, F. H. 
1895. Herbivorous Habits of Certain Dermestide. Proc. Ass. Econ. Ent., 
Bull. No. 2, n. s., Div. Ent., U. S. Dept. Agr., pp. 36, 37. 
1897. Granivorous and Other Habits of Certain Dermestide. Bull. No. 8, 
n.s., Div. Ent., U. S. Dept. Agr., pp. 14-24, 1 Fig. 
Howard, L. O. 
1904. Extract from Correspondence. Bull. No. 44, Div. Ent., U. S. Dept. 
Agr., April, pp. 90-99. 
Jayne, H. F. 
~ 1882. Revision of the Dermestidz of the United States. Proc. Amer. Philos. 
Soc., Vol. XX. 
Riley, C. V. 
1883. Trogoderma tarsale as a Museum Pest. Amer. Nat., Vol. 17, p. 199. 
1883. Number of Moults and Length of Larval Life as Influenced by Food. 
Amer. Nat., Vol. 17, pp. 547-548. 
Snow, F. H. 
1882. A New Museum Pest. Psyche, Vol. 3, pp. 351-352. 
1894. Insect Life, Vol. 6, p. 226. 
EXPLANATION OF PLATE XXVII. 
All drawings (except Fig. 4) made with a camera lucida. x 10. Stages in the 
Life History of Trogoderma tarsale (Melsh.) 
Fig. 1. A full grown larva. 
Fig. 2. Ventral view of pupa removed from the pupal case. 
Fig. 3. Adult male. 
Fig. 4. Male and female antenne. 
Fig. 5. Dorsal view of pupa as seen through the split in the pupal skin. 
