164 KANSAS UNIVERSITY SCIENCE BULLETIN. 



to ten minutes in each. They were then cleared in xylol and 

 mounted in balsam. 



In running the sections into and out of the stain (aqueous) 

 the lower grades of alcohol, 25 per cent and 35 per cent, and 

 then water, were necessary, as without their use the transfer 

 into the stain from 70 per cent alcohol was found to be too 

 sudden, causing currents which tore the sections loose from 

 the slide. Any dirt or grease on the slides made this more cer- 

 tain. However, cleaning the latter in 95 per cent alcohol con- 

 taining a few drops of hydrochloric acid obviated this. 



BIBLIOGRAPHY. 



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Berlese, a., 1896. Le Cocciniglie Italiane Viventi Sugli Agrumi. Parte 

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COMSTOCK, J. H., and KocHi, C, 1902. The Skeleton of the Head of 

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Geise, O., 1883. Die Mundtheile der Rhynchoten, Bonn. 



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Leon, N., 1887. Beitrage zur Kenntnis der Mundtheile der Hemipteren, 

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Low, Fr., 1879. Zur Systematic der Psylliden. K. K. Zool.-bot. Gesell- 

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Macloskie, G., 1886. Witlaczil on Psyllidae. Amer. Nat., vol. XX, 

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Mally, C. W., 1894. Hackberry Psyllidas found at Ames, Iowa. Proc. 

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