318 Annals Entomological Society of America [\'ol. Ill, 



— Antennal tubercles as in the above genus. Nectaries tapering, wings with 



the cubital vein having but a single fork Toxoptera 



VIII. Antennal tubercles with a strong tooth on the inner side. Nectaries 

 almost cylindrical but tapering slightly. Cauda short and tapering 



Phorodon 



— Antennal tubercles with a prominent blunt projection forming the inner 



side. Nectaries slightly clavate, cauda tapering and with a knobbed tip. 



Rhopalosiphum 



— Antennal tubercles with a distinct but not prominent blunt projection 



forming the inner side of the tubercle (more jjrominent in the apterous 

 forms). Nectaries cylindrical and slightly curved at tip. Cauda short 

 and tapering, being almost triangular inform Myzus 



Gen. Illinoia new genus 



type AI. liriondri Aloncll 



Antennae longer than the body, six segmented, and situated 

 on prominent tubercles; spur of sixth segment as long or longer 

 than the third; first segment strongly gibbous on inner side. 

 Antennal tubercles and inner side not gibbous but tapering. 

 Body elongate, wings long and medium stout; cubitus twice 

 forked. Nectaries almost as long as the abdomen, broad at 

 the base and tapering, being strongly constricted for a short 

 distance back of the tip. Tip curved outwardly. Cauda 

 ensiform, about one third the length of the abdomen and 

 constricted in the middle. Anal ]:)late broad and bluntly 

 angled. 



Gen. Nectarosiphon Schouteden 



type M . nihicola Oestlund. 



Antennae longer than the body, six segmented, and placed 

 on fairly ])rominent tubercles; spur of sixth segment shorter 

 than the third segment, first joint slightly gibbous on inner side. 

 Front of head ilat and narrow. Body elongate, wings large, 

 nectaries about one fourth the length of the body with distal 

 half dilated. Cauda one half the length of the nectaries and 

 tapering. Anal plate triangular. 



Gen. Macrosiphum Passerini 



lyjK' .1. rosac Linn. 



Antennae six segmented, longer than the body and situated 

 on fairly prominent tubercles; spur of sixth segment longer than 

 third, first segment about as long as broad. Antennal tubercles 

 slightly gibbous on the inner side. Inner surfaces at right 

 angles to the head; forehead flat. Wings long, cubitus with two 

 forks. Nectaries about one fourth the length of the body and 

 tapering. Cauda as long as the nectaries and ensiform. 



