The Aphididae of Nebraska 69 



tending across between the honey tubes. Honey tubes slenderer and some- 

 what shorter than in female. 



Length of female 1.90 to 2.25 mm., to tip of wing 3.50 to 3.95 mm. 

 Length of male 1.40 to 1.50 mm., to tip of wing 3.30 mm. 



On the upper branches, petioles, leaves and flower stalks of 

 Thalictrum polygamum. Ashland, June 11. On Thalictrum sp., 

 War Bonnet Canyon, June 21, 1890. Causes the leaves to become 

 somewhat deformed. 



Cotypes in the collection of the University of Nebraska (nos. 

 in, 112) and of the U .S. National Museum (nos. 139, 140). 



Genus Rhopalosiphum 

 86. Rhopalosiphum dianthi (Schrank). 



Schrank, Fn. Boi., II, p. 114 (1801). Aphis dianthi. 



Kaltenbach, Mon. Pflan., p. 42 (1843). Aphis dianthi. 



Koch, Die Pflan., p. 42, figs. 55, 56 (1854). Rhopalosiphum dianthi. 



Buckton, Mon. Brit. Aph., Vol. II, p. 15 (1879). Rhopalosiphum 



dianthi. 

 Thomas, Ins. 111., 8th Rep., p. 80 (1879). Rhopalosiphum dianthi. 

 Oestlund, Syn. Aph. Minn., p. 76 (1887) ; List Aph. Minn., p. 34 (1886). 

 R. sonchi. 

 Apterous viviparous female: Color shining green, ochreous yellow or 

 brownish yellow. Skin finely punctured, ovate. Pointed towards the apex. 

 Head broad. Antennae shorter than the body, on rather large frontal 

 tubercles. Honey tubes green, with black tips. Tail green, about one third 

 the honey tubes in length. Abdomen convex, and being transparent, often 

 seen mottled with yellow young embryos. The color is, however, exceed- 

 ingly variable. In autumn it is often of an ochreous red and deeply fur- 

 rowed and wrinkled. 



Pupa: Much like the larva. Wing cases tipped with brown, points of 

 antennae brown. 



Winged viviparous female: Head, thorax and band on prothorax black. 

 Abdomen shining reddish yellow, with a broad black dorsal spot, several 

 dark lines and marginal row of black dots. Legs ochreous. Antennae 

 black, as also are the femora, the tibial points and tarsi. Honey tubes 

 brown. Wing insertions and subcostal yellow. Stigma gray. Rostrum 

 reaches the second coxae. The winged form appears of various colors, 

 such as green, ochreous and even black (Buckton). 

 Length of body about 2 mm. The apterous form is generally smaller. 



Common on carnation pinks and various other house plants 

 found at all times of the year in the conservatories. Ashland, 

 Weeping Water, Lincoln, West Point. 



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