Family— APHIDID^. 

 Tribe-APHIDIN-ffi. 



G-ENUS YII.— RHOPALOSIPHUM,* Koch, 



KOLBENLAUSE. OlUBBED ApHIS. 



Rostrum as in Siphonophora. 



Antenna3 rather short. Frontal tubercles small and 

 inconspicuous ; remote at their bases. Vertex flat or 

 slightly convex. 



Cornicles long, clavate, or dilated in their midst. 

 Mouths trumpet-shaped. 



Wings and legs as in Myzus. 



Tail conspicuous and often large. 



Rhopalosiphum ribis, Linn. Plate XXXIX. 



Aphis ribis, Linn., Schr., Kalt., Walk. 

 BJiopalosiphum ribis, Koch, Pass. 



Apterous viviparous female. 



Large, oval, convex. Wholly shining green, mot- 

 tled with darker green. Autennse, nectaries, and legs, 

 paler green. Cornicles much dilated. Eyes red. 

 Cauda large, projecting beyond the tips of the 

 cornicles. 



Numerous from April to July upon the black cur- 

 rant, Bibes nigrum. It crowds under the leaves during 

 early summer, and raises upon them bright orange, red, 

 and brown blisters, causing them to curl into knots and 



* From PonaXov, a chib, and aiiputv, a tube, 



