STOUGH: THE HACKBERRY PSYLLA. 165 



Mally, C. W., 1895. Psyllidas found at Ames. Proc. la. Acad. Sci., 1894, 

 vol. II, pp. 152-171. 



Marlatt, C. L., 1895. The Hemipterous Mouth. Proc. Ent. Soc. Wash., 

 vol. Ill, pp. 241-249. 



Maskel, W. M., 1889. On Some Species of Psyllidae in New Zealand. 

 Trans. N. Z. Inst., vol. XXII, 1889, art. XVII, pis. X-XII, pp. 157-170. 



Meek, W. J., 1903. On the Mouth Parts of the Hemiptera. Kan. Univ. 

 Sci. Bull., vol. II, No. 9. 



Packard, A. S., 1887. Hackberry Psyllidae. Fifth Rept. U. S. Ent. Com., 

 pp. 614-622. 



Reiber, F., 1875. Translation of Dr. Franz-Xavier Fieber's "Les Cica- 

 dines D'Europe." 



Riley, C. V., 1893. The Pear Tree Psylla. Insect Life, vol. V, pp. 226- 

 230. 



Riley, C. V., 1889. Note on work done by Low and his predecessors on 

 the Psyllidae. Insect Life, vol. II, No. 6, p. 196. 



Riley, C. V., 1883. Hackberry Psyllid Galls. Can. Ent., 1883, vol. 15, 

 pp. 157-159. 



Riley, C. V., 1883. The Psyllidae of the United States. Science, 1883, 

 vol. 2, p. 337. 



Riley, C. V., 1884. Notes on North American Psyllidae. Proc. Biol. Soc. 

 Wash., 1884, vol. II, pp. 67-79. 



Sanborn, C. E., 1906. Kansas Aphididae. Kan. Univ. Sci. Bull., vol. Ill, 

 No. 1. 



ScuDDER, S. H., 1890. Tertiary Insects of North America. Plate 12, figs. 

 11 and 21; pp. 276-278. 



Slingerland, M. v., 1896. The Pear Tree Psylla. Bull. 44, Cornell 

 Univ. Agr. Exp. Sta. 



Smith, J. B., 1892. Structure of the Hemipterous Mouth. Science, vol. 

 19, No. 478. 



Snodgrass, R. E., 1909. The Thoracic Tergum of Insects. Ent. News, 

 vol. XV, No. 3, pp. 97-104. 



Snodgrass, R. E., 1907. A Comparative Study of the Thorax in Orthop- 

 tera, Euplexoptera, and Coleoptera. Proc. Ent. Soc. Wash., vol. IX, 

 Nos. 1-4. 



Tucker, E. S., 1907. Some Results of Desultory Collecting of Insects in 

 Kansas and Colorado. Kan. Univ. Sci. Bull., vol. IV, No. 2. 



Wedde, H., 1885. Beitrage zur Kenntniss des Rhynchotenriissels, Berlin. 



Wheeler, W. M., 1893. A Contribution on Insect Embryology. Journal 

 of Morphology, vol. VIII, No. 1. 



WiTLACZiL, E., 1885. Die Anatomie der Psylliden. Zeitschrift fiir 

 Wissenschaftlichen Zoologie, vol. XLII, pp. 560-658. 



WooDWORTH, C. W., 1906. The Wing Veins of Insects. Univ. of Cal. 

 Publications, vol. I, No. 1, pp. 122-125. 



Zoological Record, 1886. Frauenfeld on Anisostropha ficus Linn, in 

 Verh. zool.-bot. Ges. in Wien, XVII, pp. 801-803. 



