WOOLLY APHIDS OF THE ELM. 287 



Lachnus uhni (Linn.) Thomas, 1879, P- np "error for Schizo- 



neura ulmi (Linn.)." 

 Mysocallis ulmifolii (Monell). Gillette, 1910, p. 369. 

 Pemphigus pallidus (Haliday) (P. albus Licht.) (ulmi Licht?) 



Buckton, 3, p. 127. 

 Pemphigus ulmi Licht. Lichtenstein, 1880, pp. 1-5. 

 Schisoneura compressa Koch. Lichtenstein, La Flore. 

 Tetraneura alba Ratz? (Schizoneura compressus Koch) Kalten- 



bach, 1874 p. 540. 

 Tetraneura rubra Licht. Lichtenstein, La Flore. 



URTICA. Nettle. 



U. dioica Pursh. Stinging Nettle. 



Aphis tertia Walker. Walker, 1849c, p. 45. 



Aphis urticae Fab. (urticaria Kalt.). Ferrari, 1872, p. 65. 



Aphis urticaria Kalt. Buckton, 2, p. 51. 



Siphonophora pisi (Kalt.) Koch (A. ulmariae Schrank) (onobry- 

 chis Boyer) (lathyri Walker). Buckton, i, p. 135. 



SipJionophora urticae (Kalt, Schrank) Koch. Buckton, i, p. 144. 

 U. gracilis Ait. 



SipJionophora pisi Kalt. Williams, 1891, p. 18. 

 U. holosericea Nutt. 



Macrosiphum pisi Kalt. Davidson, 1909, p. 304. 

 U. urens L. 



Aphis rumicis Linn. Walker, iSsoa, p. 19. 



Aphis urticae Fab. (urticaria Kalt.). Macchiati, 1883, p. 258. 



Aphis urticaria Kalt. Buckton, 2, p. 51. 



Siphonophora carnosa Buckton. Buckton, i, p. 145. 



Siphonophora urticae (Kalt., Schrank) Koch. Buckton, i, p. 145. 

 U. sp. 



Aphis lamii Koch. Koch, p. 85. 



PO>LYGONACEAiE. BUCKWHEAT FAMILY. 



ERIOGONUM. 



E. alatum Terr. 



Aphis eriogoni Cowen. Cowen, 1895, p. 119. 

 E. umbellatum Terr. 



Aphis eriogoni Cowen. Cowen, 1895, p. 119. 

 E. sp. 



Nectarophora martini Cockerell. Cockerell, 1903a, p. 171. 



POLYGONUM. (Persicaria) Knotweed. 



P. aviculare L. 



Aphis ? polygoni Macchiati var. Schouteden, 1906a, p. 226. 

 Aphis polygoni Walker. Walker, 1848c, p. 2249. 



