478 MAUD D. HAVILAND 
25. Timberlake, P. H. (1910).—-‘‘ Observations on the early stages of two 
Aphidiine parasites of Aphids ”’, ‘ Psyche ’, Mass. 
26. ——(1913).—‘ Preliminary Report on Parasites of Coccus 
hesperidium in California ”’, ‘Journ. Econ. Entom.’, vol. vi, 
pp. 293-3038. 
27. Wheeler, W. M. (1907).—‘‘ The Polymorphism of Ants, with an account 
of some singular abnormalities due to Parasitism ”’, ‘ Bull. Amer. 
Mus. Nat. Hist.’, vol. 23, Art. I. 
