24 
BULLETIN 1222., U. S. DEPARTMENT OF AGRICULTURE. 
Table 3. — Ratio of weight, in milligrams, of unconsumed food in cell, to weight 
of larva at different approximate age period*. 
Approximate age. 
Egg.... 
1.1 days 
1.4 davs 
2.1 days 
2.6 days 
3 days.. 
3.5 days 
4.4 days 
Number 
of obser- 
vations. 
Several. 
33 
131 
24 
35 
25 
05 
17 
Average 
weight of 
food per 
cell. 
None. 
3.96 
3.23 
9.10 
11.79 
5.05 
7.75 
s. 70 
Average **««* 
weight 
of larva?. 
food 
to larva. 
0,10 
1.02 
1.36 
7.20 
17.48 
25.22 
63.46 
115. 15 

388 
238 
126 
67 
20 
12 
8 
Table 4. — Composition of larval food* — von Planta (?) 
Queen. 
Drones. 
Workers. 
Composition of dried substance. 
Under 
4 days. 
Over 
4 days. 
Under 
4 days. 
Over 
4 days. 
Per cent. 
45. 15 
13. 55 
20.39 
Per cent. 
55.91 
11.99 
9.57 
Per cent. 
31.67 
4.74 
38.49 
Per cent. 
53. 38 
s.3s 
IS. 09 
Per cent. 
27.87 
Fat 
3.69 
44.93 
LITERATURE CITED. 
(1) Dandolo, V. 
1818. Storia dei Bachi da seta coi nuovi metodi. Milano. 
(2) Herms, W. B. 
1907. An ecological and experimental study of Sarcophagidae with ref- 
lation to lake beach debris. In Jour. Expt. Zool., v. 4, No. 1, 
p. 45-83, 7 fig. 
(3) Hunter, W. D., and Pierce, W. Dwight. 
1912. Mexican cotton-boil weevil. Washington, I). C. 62d Cong., 2d 
sess., Senate Doc. 305, 188 p., 22 pi., 34 fig. 
(4) Lyonet, P. 
1762. Traite anatomique de la Chenille, qui rouge le hois de Saule. 616 
p., illus. Haage. La Haye. 
(5) Minot, Charles Sedgwick. 
1891. Senescence and rejuvenation. First paper : On the weigbt of 
guinea pigs. In Journ. Physiol., v. 12, p. 97-153. 3 pi. 
(6) Newport, George. 
1839. Insecta. In Todd's Cyclopaedia of Anatomy and Physiology, v. 
2, p. 853-994, illus., London. 
(7) Planta, A. von (Dr.) 
1888 and 1889. Ueber den Futtersaft der Bienen. In Ztschr. Physiol. 
Chem., 12 Bd., 1888, p. 327-354 ; 13 Bd.. 1889, p. 552-561. 
(8) Snodgrass, R. E. 
1910. The anatomy of the honey bee. U. S. Dept. Agr.. Bur. Ent, Tech. 
Series 18, 162 p., 57 fig. 
(9) Straus, J. (Dr.). 
1911. Die chemische Zusammenzetzung der Arbeitsbienen und Drohnen 
wahrend ihrer verschiedenen Entwk-klunirsstadien. In Ztschr. 
Biol., 56 Bd., 7 und 8 Hft., p. 347-397. 9 fig. 
(10) Trouvelot, L. 
1867. The American silkworm. In Amer. Nat., v. 1, p. 30-38, 85-94, 
145-149. illus. 
(11) Whiting, P. W. 
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