WOOLLV AFHIDS OF THE ELM. 2/3 



lar sensoria are broad,, the hollows between them deep, and they 

 occur only on III-j-IV. Ill is nearly twice IV+V-f-VI in 

 length. The terminal sensorium of V is more or less circular 

 and fringed. In this respect it resembles the corresponding 

 sensorium on the apterous forms of our other elm species whose 

 winged forms have, however, lost this character, their terminal 

 sensorium of A' being apparently only a modified annulation a 

 little broadened or otherwise irregular in shape. 



BIBLIOGRAPHY. 



1857. Schizoneiira iilini, Koch. Pflanzenlause. Fig. SSJ, 338- 



1879. Schisoneura ulni'i, Courchet. 



1880. Scliizoncura uliiii. Kessler. Xeue Beobachtungen und Entdeckun- 



gen an den auf Ulmus campestris L. vorkommenden Aphiden- 

 Arten. Taf. II, Fig. 17-21. 



1881. Schisoneura iilmi. Buckton Monogr. of Brit. Aphides. Vol. III. 



PI. CVIII and CIX. Fig. 1-4. 

 i88r. Schisoneura fodiens, Buckton. ^^lonogr. of Brit. Aphides. Vol. 



III. PI. CVI. Fig. 6-12. 

 1896. Schisoneura fodiens, Cholodkovsky. Aphidologische ^litteilun- 



gen. Zool. Anz. X. 520, p. 508-513. 

 1906. Schisoneura ulnii {fodiens), Schouteden.. Cat. des Aphides de 



Belgique. 

 1909. Schisoneura ulnii (fodiens), TuUgren. Aphidologische Studien I. 



pp. 163-169 and Figs. 78-82. 

 1912. Schisoneura iilmi {fodiens), Theobald. Journ. Econ. Biol. Vol. 



VII, X'o. 3, pp. 111-115. Figs. 13 B and € and 14. (Fig. 13 A 



is evidently not uhni-fodiens) . 

 1913- Schisoneura uhni (fodiens). Reh, L. Ilandbuch der Pflanzen- 



krankheiten von Prof. Dr. Paul Sorauer, Dritter Band. Die 



tierischen Feinde. Bearbeitet von Dr. L. Reh. 



1879. Schisoneura ulnii, Courchet. 'Etude sur les galles produites par 

 les aphidiens, Mem. de. I'acad. Montpellier, p. 99. From 

 description of antenna, evidently not ulnii (fodiens). 



1908. Schisoneura itlini, Okajima. Contribution to the Study of Japa- 

 nese Aphididse. Reprint Bui. Col. Agr. Tokyo Imperial Univ. 

 Vol. VIII, Xo. I. Plate II, Fig. 2. This is not uhni (fodiens). 

 Ill is shorter than IV+V-fVI. V is at least twice IV in 

 length and annulated. This antenna has much the same pro- 

 portions and characters as Theobald 1912, Fig. 13 A and may 

 possibly be the same species. 



