Aphididae of Formosa. — 3. 13 



fourth instill' of the winged form, are fused together iu the other insfars of this 

 form, while they are always fused together iu the nymphs of the wingless form. 



In Orer/vm paiu'co/a Takah., as already mentioned, the grown nymphs of the 

 winged form are provided with numerous very small wax-pores scattered over the 

 dorsum of the head and thorax, while those of the apterous form like the wingless 

 adults are provided with some larger circular pores distributed as in 0. luoidaua v. 

 d. Goot. The nymphs of the brachypterous form usually do not differ from those 

 of the normally winged ones. 



Literature 

 Baker, A. C. 1915. The woolly apple aphis. U. S. Uept. Agr., Report 



101. 



1917, Life history of J7((crus/)*/t«/« /7i'/;/(v'e/«.s7'.s, the gra[)evine 



apliis. Jl. Agr. Research, xi, :^>, pp. 83-89. 



1918. Another Toxoptera feeding on sedge. Psyche, xxv, 4, 



pp. 88-93. 



1913. Aphids: their human interest. 49 Ann. Rept Ent. 



Soc. Ontario, pp. 28-32. 



1919. The houghton gooseberry aphis. .Jl. Econ. Ent., xu, 



pp. 433-440. 



and Turner, W. F. 191G. Morphology and biology of the gre('n 



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Davidson, W. M. 1914. Walnut aphides in California. U. S. Dept. Agr., 



Bull. 100, pp. 1 48. 

 1919. Life history and habits of mealy plum aphis. U. S. 



Dept. Agr. Bull. 774. 

 Davis, J. J. 1909. Biological .studies on 3 species of Aphididae. U. S. 



Dept. Agr., Bureau of Ent., technical series 12,8. 

 1915. The pea aphis with relation to forage crops. U. S. 



Dept. Agr., Bull. 276. 

 Ewing, H. E. 191lj. 87 generations iu a parthenogeuetic pure line of v/^Vz/.s 



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 Fuller, C. 1920. Studies on tiie post-embryonic development of the 



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