794 Pomona College Journal op Entomology 



1843 Aphis nyinpharac Linn. Kalt. ^lon. Pflz., p. 104. 



1854 Hhopahisiphutn )iyinphaeaehmn. Koch. Pflz., pp. 44-45. 



1854 liliopalosiphum alisniae Koch. Pflz., pp. 26, 44. 



1854 Rhopalosiphum najadum Koch. Pflz., pp. 45-46 



1879 Kltopalosiplutin nymphaeae Linn. Buck. iMon. Brt Aphid., II, p. 12. 



1893 Kliopalosiphum nymphaeae Linn. Osborne-Sirrine. Proc. la. 



Acad. Sci., Ill, p. 98. 

 1893 Khopalosiphwm nymphaeae Linn. Osborne-Sirrine. In.sect Life, V, 



p. 236. 

 1895 KJwpalosiphmn nympliaeaehmn. Cowen. Hem. Colo., p. 123. 

 1901 ElKipalosiplium nymphaeae Linn. Hunter. Aphid. N. A., pp. 106- 



107. 

 1905 Bhopalosiphum nymphaeae Fabr. Schout. Aphid. Belg., p. 236. 

 1905 lihopalosiphum nymphaeae (Linn.) Kii-kaldy. Can. Ent. 



XXXVII, p. 415. 

 1908 Aphis aquaticus Jackson. Oliio Natr., VIII, p. 243. 

 1910 Rhopalosiphum mjmphaiac (Linn.) Williams. Aphid. Nebr., p. 70. 

 1910 Bhopalosiphum nymphaeae {lAnn.) Davis. Ent. News, XXI, pp. 



245-247. 

 1910 Rhopalosiphum numphaeae Linn. Davidson. Jr. Ec. Ent. Ill, p. 



377. 

 1910 Rhopalosiphum nymphaeae Linn. Davis. Jr. Ec. Ent., Ill, p. 494. 



WINGED VIVIPAROUS FEMALE (Figure 252, A) 



Length of body 1.5 mm., width of the mesothorax 0.4 mm., width of the 

 abdomen, 0.65 mm., wing expansion 4.8 mm. Body — Small, oval to oblong 

 in shape, dark, dorsum smooth and often shiny, ventral surfaces of the thorax, 

 head, antenna and legs covered with rather long white floeculence. This is 

 secreted on the lower surface of the thorax and is evidently gathered up by 

 the appendages coming in contact with it. Prevailing color — Light yellowish- 

 green to a dark olive to almost blackish-green, with the white floeculence under 

 the thorax. Head — Nearly as wide as the prothorax, pointed in front, with 

 small frontal tubercles, dark olive-green, pruinose ventrally. Eyes — With 

 distinct tubercles, large, red. Antennae— {Figure 252, 1, 2). Reaching to the 

 iiiiddlo of the abdomen, but not to the bases of the cornicles, on short but 

 distinct frontal tubercles, which are wide apart at the base, imbricated, with 

 very few hairs, dull olive green to dark amber throughout. Lengths of articles : 

 I, 0.05 mm.; II, 0.05 mm.; Ill, 0.25 mm.; IV, 0.14 mm.; V, 0.118 mm.; VI, 

 0.38 mm., (base 0.09 mm., spur 0.29 mm.) ; total 0.988 mm. Articles I and 

 II large and co-equal ; III longer than either IV or V, but not quite as long as 

 the two together, IV always slightly longer than V, VI longer than any of 

 the rest, the base much shorter than either IV or V, the spur longer than III 

 and longer than IV and V together, the apical fourth is not imbricated at all, 

 a very noticeable characteristic. The sensoria are circular and vary in size 

 and shape as well as in number. Article III has from five to thirteen, but 



