The Aphididae of Nebraska 19 



provided with brown hairs. Antennae robust, beset with brown hairs. 

 Joints I and II short, smooth ; III long, with row of tubercles on its outer 

 ventro-lateral surface; IV and V subequal, with tubercles as on three; 

 VI a little longer than V, excavated on its outer lateral surface about two 

 thirds distance from base. Wing veins mostly brown. Stigma brownish 

 with anterior portion darker." 



The form found on grass roots differs from this in being lighter 

 colored generally, and in having fewer sensoria on the antennae. 

 This is due to the habitat and to the fact that the root form is 

 not so well developed. I think that there can be no doubt that 

 these two belong to the same species. I find on referring to my 

 notes, that I had noticed the resemblance and could get no satis- 

 factory difference between them before the excellent article by 

 Professor Osborn came out. I have found many individuals on 

 Cornus that were lighter colored than those on roots of grass ; 

 and have also found the number of sensoria to be quite variable. 



Found during the summers of 1888 to 1890, on Cornus stoloni- 

 fera, C. asperifolia, C. paniculata, generally on the under side of 

 the leaves, but frequently so plentiful as to almost completely 

 cover the tree. 



The root form is found on Panicum glabrum, P. crus-galli, P. 

 capillare, Setaria glauca, S. viridis, S. italica, Eragrostis major, 

 Polygonum persicaria, P. pennsylvanicum, and a number of other 

 garden weeds in the eastern part of the state. 



What goes before is found in Bulletin 22, U. S. Ent. Div., in 

 Weed's description from Psyche, V, 129. 



Specimens of root form in collection of the University of Ne- 

 braska (no. 16). 

 15. Schizoneura crataegi Oestlund. 



Oestlund, Syn. Aph. Minn., p. 27 (1887). 



Apterous form: General color pale greenish. Eyes very small and im- 

 perfect, black. Beak reaching beyond hind coxae. Antennae pale, 6-jointed ; 

 I and II small and bead-like, III equal to IV, V and VI together. Legs 

 pale. Honey tubes represented by circular openings, along the edges of 

 which are black lines. Very thickly covered over with white flocculency. 

 The stem-mother is dusky brown, with more or less of a reddish tinge, 

 and has dusky limbs. 



Winged form: Head and thorax shining black; abdomen dusky to black- 



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