1909] Observations on a Gall Aphid 99 



Lichtenstein, J., Les Pucerons, 1884, Chap. 4 (La Flore des Aphidiens) pp. 80, 

 85. Atriplex and Chenopodmin. 



Oestlund, O. W., Ann. Rept. Gcol. & Nat. Hist. Surv. Minn., 14, 1886, p. 47. 

 Minnesota, Chenopoditim album. (lb.. Bull. 4, Geo!. & Nat. Hist. 

 Surv. Minn., 1887, p. (59.) 



Bruner, L,, U. S. Dept. Agric. Btir. Ent. Bull. 23 (o. s.) 1891, p. 17. On the beet 

 at Ashland, Nebr. (T. A. Williams.) 



Williams, T. A., Univ. Nebr., Dept. Ent., Special Bull. 1., 1891, pp. 6, 10, 12, 

 20. Nebr. On cultivated beet, Rumex altissimus, Chenopodium album 

 and hydridtim. 

 :=chenopodii Cowen., Cowen, J. H., Colo. A. E. S. Bull. 31 (Tech. Ser. 

 No. 1), 1895, p. 119. Descriptions of winged and wingless viviparae and 

 galls. Colo., Chenopodium album; galls collected in July. 



Del Guercio, G., Nuov. Relazioni R. Staz. Ent. Agrar. Firenze (1) No. 2, 1900, 

 pp. 124, 132. Italy. Differential characters in table of species of 

 Aphis. Chenopodium album and Atriplex patula. 



Forbes, S. A., Bull. GO, 111., A. E. S. 1900, p. 430. Illinois. Eggs in dried rolled 

 leaves of Atriplex. Suggests that this species may be identical with 

 Aphis gossypii Glover. (I do not think this possible. The two species 

 have totally different cornicles, those of Aphis gossypii are much longer 

 than the 4th tarsus, incrassate at the base, elsewhere cylindrical, imbri- 

 cated, black.) 



Hunter, W. D., Bull. 60, Iowa A. E. S., 1901, p. 93. Partial bibliography. Hosts, 

 distribution. 



Connold, E. T., British Vegetable Galls, 1902, pp. 233-4, pi. 101. England. 

 Atriplex augustifolia and patula. Abundant along the coast and 

 inland. Winged viviparse emerge in August. All stages including 

 sexes and ova in galls during the fall. (Notes on the insects' show that 

 he evidently had colonies mixed with Aphis rumicis (?). Photograph 

 of infested plants showing galls. 



Bignell, G. C, Ann. Rept., 72 Roy. Cornwall Polytech. Soc. 1904, p. 24 (Separate) 

 England. Atriplex latifolia. 



Luff, W. A., Guernsey Soc. Nat. Sci., Rept. and Trans, for 1905, p. 88. Mention. 



Schouteden, H., Cat. d. Aphides de Belgique. in Mem. Soc. Ent. Belg. 12, p. 216. 

 Belgium; Atriplex, Chenopodium album. 



Sanborn, C. E., Kansas Univ., Sci. Bull. Vol. 3, No. 8, 1906, pp. 232, 235, 248, 

 254, 255. Compiled list of hosts. 



PLATE XV. 



Leaf-gall; a, b, cross-sections. 



Winged vivipara. pt., pronotum; //., lateral tubercle; p., prescutum; 



5., scutal lobes; sL, scutellum; ps., post-scutellum; mt., metatergite. 

 Wingless male. 

 Ovipara, hind tibia. 

 Winged vivipara. 

 Forewing of same. 

 Forewing of Aphis rtimicis (?). 

 Cornicle of Aphis atriplicis, distal end. 

 Cornicle of Aphis rumicis (?), distal end. 

 Third antennal joints of Aphis atriplicis, winged vivipara, from same 



individual. 

 Cornicles, two variations in the bulge in subgenus Siphocoryne. 

 Cornicle of Aphis atriplicis. 

 Cornicle of Aphis rumicis (?). 

 Cauda of Aphis rum.icis (?). 



Third antennal joints of Aphis atriplicis, from four individuals. 

 Antenna of Aphis rumicis (?), winged vivipara. 

 Antenna of wingless male of Aphis atriplicis. (Thickness somewhat 



exaggerated.) 

 Antenna of winged vivipara of Aphis atriplicis. 

 Cauda of wingless inale of Aphis atriplicis. 

 All figures except 1 and 2 made with camera lucida. 



