(13) 



broadly ovoid, and very convex ; abdomen very distinctly acuminate 

 at the apex, but no tail apparent. 



The other variety is rather less convex, and the dorsal surface is 

 more or less shaded with brown ; in the darker specimens this color 

 sometimes occupies most of the back ; there is usually a median line 

 or stripe of green on the posterior half of the abdomen, which can of- 

 ten be indistinctly traced to the thorax : the thorax generally more or 

 less shaded with pale brown ; tip of the abdomen usually pale or green- 

 ish, and not acuminate as in the other variety ; tail distinct but short, 

 whitish ; honey-tubes dark at the tips ; remainder, and a space around 

 the base, yellowish-brown. 



Legs rather short. Antennae reaching to the honey-tubes or nearly 

 to the tip of the abdomen ; honey-tubes very short, almost reduced to 

 tubercles, length about twice their diameter. 



Found at Ft. Dodge, Iowa, about the first of September, on the leaves 

 of Symphvrirarpus vulgaris ] on the under side of the leaves near the 

 ends of the branches. 



38. Aphis pruni, Koch, Pflanz., 68, Fijjs. 88-90. 



Aphis prunifoliae, Fitch. 

 Green, with more or less black. On the leaves of native and culti- 

 vated plums. 



39. Aphis rumicis, Linn., Syst. Nat., II, 734. 



For the numerous synonyms given by Walker, See Walker, List, 

 Homop. Brit. Mus., 981. Also Trans., 111. St. Hort. Soc, 1876, 163. 

 Some of these synonyms are erroneous. 



Black. On the Bean, Dock, &c. 



40. Aphis cornifoliae, Fitch. Senate, No. 30, 65, 1851. 



Black. On the leaves of Cornus paniculata. 



41- Aphis circaezandis, Pitch. 



Head and thorax black. On leaves of Galium circaezans. 



42. Aphis crataegifoliae, Fitch. Senate, No. 30, OG, 1S51. 



Black, abdomen green. On the leaves of Crataegus punctata. 



43. Aphis betulaecolens, Fitch. Ibid. 



Sulphur-yellow. On the Beech. Probably belongs to Callipterus. 



44. Aphis sambucifoliae, Fitch, ibid. 



Black (probably greenish-black? . On Elder leaves. It is quite 

 probable this is .4. sambuci, Linn. 



