Williams' "The Aphididae of Nebraska" ^ 



far as is known. I am unable to place it, but consider it as 

 possibly a synonym of either Pemphigus nlmifusus Walsh or 

 Tetraneura ulmisaccnli Patch — more likely the former. I believe 

 several errors, probably typographical, have been made but this 

 cannot be positively ascertained. For instance, in line 5 of the 

 description, 2 mm should probably read .2 mm; in line 12, 8 

 would be more likely than 80 rings on segment VI ; and very 

 probably " V, 0.80 mm " in the same line should read " V, 0.08 

 mm"; " discoids " in lines 17 and 19 should be " discoidals." 



Under these circumstances it will be best to leave it as a sep- 

 arate species, at least until specimens can be collected from Ash- 

 land and Lincoln (Dinges), Nebraska, the type localities of 

 Williams' ivalshii, and further comparisons made. 



13. Schizoneura americana Riley. 



14. S. panicola Thomas {S. conii Fabricius). 



" Schizoneura panicola Thos. No. 16. On roots of Setaria, 

 Weeping Water, Aug. 18, 1890." 



Only wingless on slide. They agree perfectly with Hart's 

 description of this species. 



15. S. crataegi Oestlund. 



16. S. lanigera Hausmann. 



17. S. rileyi Thomas. 



18. Tetraneura graminis Monell (Colopha nlinicola Fitch). 



" Colopha ulmicola (Fitch). No. 20B. On Ulmus americana, 

 Ashland, 6/1 1, '90." 



There are five winged and several pupae on the slide. They 

 prove to be Tetraneura graminis {colophoidea) Monell and not 

 Colopha ulmicola. 



19. Lachnus dentatus LeBaron. 



20. L. flocculosa Williams. 



The slides bearing specimens of this species are probably lost. 



21. L. ponderosae Williams. 



" Lachnus Ponderosae n. sp. No. 24. On Pinus ponderosa var. 

 scopulorum, 6/20, '90. War Bonnet C." 



The slide contains two winged, and one wingless adult vivip- 

 arous female. This species is a rather large one. Only the 



257 



