The Aphididae of Nebraska 65 



On stem and leaves of Oenothera biennis. Ashland, May 25 

 and 30, 1890. It causes the leaves to curl up somewhat. 



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

 103, 104) and of the U. S. National Museum (nos. 134, 397). 



81. Myzus plantagineus Passerini. 



Passerini, Gli afidi, p. 35 (i860). 



Apterous viviparous female: Pale green, somewhat pulverulent. An- 

 tennae pale, nearly or quite as long as the body, on very prominent swollen 

 tubercles; first joint conspicuously gibbous, apical joints dusky. Legs 

 pale. Honey tubes reaching to tip of abdomen, very slender, green. 



Winged viviparous female: General color green. Antennae as in apter- 

 ous form but dusky to black, with paler base. Head and thorax black. 

 Prothorax green. Eyes very dark red. Wings with robust black veins, 

 narrowly bordered with smoky brown. Second branch of cubitus rather 

 nearer to the apex of the wing than to the first branch. Stigma rather 

 narrow, acute at outer end, dusky. Hind wings with robust, smoky black 

 veins. Abdomen pale green, without any darker markings, except in a 

 few specimens a darker green spot at the base of each honey tube. Honey 

 tubes concolorous with the abdomen, slightly swollen at the tips, 0.32 mm. 

 long. Tail concolorous with abdomen, 0.08 mm. in length. Legs pale, with 

 dusky to black joints and tarsi. Length of body 1.45 mm., to tip of wings 

 2.70 mm. 



On the under side of leaves and on the petioles of common 

 plantain (Plantago major) near the ground. Fremont, July 31, 

 1890. What is probably the same thing was taken, feeding on 

 the roots of the same plant, at Ashland, April 21, 1890. 



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

 105, 106) and of the U. S. National Museum (no. 135). 



82. Myzus potentillae n. sp. 



Apterous form: General color clear pea green; oval in outline. Eyes 

 red. Antennae brownish black, paler at the base; longer than the body, 

 on distinct, swollen tubercles. First joint swollen on inner side, III and 

 IV tuberculate, VII longer than III. Legs pale brownish, tarsi brown to 

 black. Honey tubes green, becoming brownish, not reaching to tip of 

 abdomen, hardly twice the tarsi. Tail short, obtuse, hairy. The entire 

 body covered with long capitate hairs. 



Pupa: Similar in color to apterous form; body more elongate; wing- 

 pads pale yellowish green. 



Winged female: Color and eyes as in apterous form but thorax olive 

 tinged. Antennae as in apterous form or darker; III, IV and V tuber- 



149 



