24 



BULLETIN 1222, U. S. DEPARTMENT OF AGRICULTURE. 



Table 3. — Ratio of weight, in milligram*, of unconsumed food in cell, to weight 

 of larva at different approximate age period*. 



Approximate age. 



Egg.... 

 1.1 days 



1.4 days 

 2.1 days 

 2.6 days 

 3 days.. 



3.5 days 

 4.4 days 



Number 

 of obser- 

 vations. 



Severql. 

 33 

 131 

 24 

 35 

 25 

 65 

 17 



Average 



weight of 



food per 



cell. 



None. 

 3.96 

 3.23 

 9.10 

 11.79 

 5.05 

 7.75 

 8.70 



Average 



weight 



of larvae. 



Per cent 

 ratio, 

 food 



to larva. 



0.10 



1.02 



1.36 



7.20 



17.48 



25.22 



63.46 



115.15 



23S 

 126 

 67 

 20 

 12 

 8 



Table 4. — Composition of larval foods — von Plant a (7). 





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. 3S 

 8.38 

 18.09 



Per cent. 

 27.87 



Fat 



3.69 





44.93 







LITERATURE CITED. 



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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-boll weevil. Washington, D. C. 62d Cong., 2d 

 sess., Senate Doc. 305, 188 p., 22 pi., 34 fig. 



(4) Lyonet. P. 



1762. Traite anatomique de la Chenille, qui ronge le bois de Saule. 616 

 p., illlis. Haage. La Haye. 



(5) Minot, Charles Sedgwick. 



1891. Senescence and rejuvenation. First paper : On the weight of 

 guinea pigs. In Journ. Physiol., v. 12, p. 97-153, 3 pi. 



(6) Newport. Geokge. 



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. Leber den Futtersaft der Bienen. In Ztschr. PhysioL 

 Chem., 12 Bd„ 1888, p. 327-354 ; 13 Bel.. 1889. p. 552-561. 



(8) Snob-grass. 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 chemiscbe Zusammenzetzung der Arbeitsbienen und Drohnen 



wiihrend ibrer verschiedenen Entwicklunssstadien. 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. 



1914. Observations on blow flies ; duration of the prepupal stage apd 

 color determination. In Biol. Bui. Marine Biol. Lab., v. 26, 

 No. 3, p. 184-194. 



