SANBORN : KANSAS APHIDID.E. 67 



The two basic joints sliort and thick ; third, fourth and fifth 

 joints long ; the third joint long, but not always as long as the 

 setaceous seventh. Beak moderately long. Distal joint about 

 equal to the penultimate. Prothorax in rare instances with a 

 lateral tubercle. Wings large and normally veined. Honey- 

 tubes long, often extending beyond the style, cylindrical, taper- 

 ing, and nearly always straight. Style long, generally recurved,^ 

 and ensiform. 



Genus Myzus Passerini. 



Antenna^ about equal in length to the body, on moderately 

 distinct frontal tubercles, which are gibbous on the inner side. 

 First joint of the antennae also gibbous, but not dentate.. 

 Wings moderately long, venation normal. Body often with 

 capitate hairs. Legs moderately long and robust. Honey-tube& 

 rather long and cylindrical. 



Genus Nectarosiphum Oestlund.22 



Antennse as long or longer than the body, on moderately 

 large frontal tubercles, but not approximate as in the Nectar- 

 ophora. Prothorax well developed, with a distinct lateral tuber- 

 cle. Wings rather long and clouded near the apex. Legs long 

 and slender. Honey-tubes very long, much dilated in the mid- 

 dle, and curved. Style long and conspicuous. 



Genus Phorodon Passerini. 



Vertex flat. Antennae scarcely longer than the body, situated 

 on frontal tubercles, each with a characteristic tooth developed 

 on the inner side. First joint bluntly toothed, or gibbous, 

 which is of much importance, since the frontal tubercles are not 

 significant without this ; third joint the longest ; fourth and 

 fifth joints nearly equal in length. Beak moderately long, ex- 

 tending to the second coxa. Wings moderately long, with a 

 normal venation. 



antedated by Macrosiphum Pass. (Gli Afidi, p. 27, 1860), a generic term unfortunately adopted 

 by Oestlund fora species witlilong.clavate nectaries, found on Rubus slrig oh us. v/hich he nam-d 

 Macrosijihuni riibicola, a generic term also adopted by Del Guerico ( Afidafauna Italica, pp. lU 

 and 159) for a number of species agreeing with the characters of Macrosiphum Oestlund, over- 

 looking, however, the fact that Macrosiphvm was preoccupied by Passerini for a genus struc- 

 turally quite diilerent. Dr. M. H. Schoutenden was the first to observe this error, and chanered 

 Macmsiphum Oestlund to Nectarosiphon, in contradistinction to Macrosij)huvi Passerini." — 

 U. S. Dept. of Agric, Div. Ent., Bull. No. 44, pp. 13 and 14, 1904. 



22. No representative in this text. 



