The Aphididae of Nebraska 6\ 



Apterous viviparous female: Green to olive green, pulverulent. An- 

 tennae very short, only about one fourth the body in length, the three 

 apical joints blackish. Beak reaching almost to hind coxae, black tipped. 

 Legs pale green, except tarsi and tarsal end of tibiae, which are blackish. 

 Honey tubes rather short, blackish. Tail not noticeable, but the abdomen 

 prolonged into a conical tip. Later in the season the apterous forms have 

 but 6-jointed antennae. 



Pupa: Oblong, very pulverulent. Head brownish. Wing-pads pale 

 greenish. 



Winged viviparous female: Head and thorax black. Beak reaching hind 

 coxae. Eyes black. Antennae about two thirds as long as the body; 

 shining black; III-V unusually robust, with sensoria, III and IV very 

 thickly covered with them ; VII filiform, much longer than III. Pro- 

 thorax brown, with lateral tubercles. Wings with very large brown stigma 

 and slender, oblique veins. Legs shining black except the immediate bases 

 of the femora. Abdomen greenish brown, with black marginal spots and 

 transverse bands and often a large dorsal spot. Honey tubes black, 0.30 

 mm. Tail acutely conical, short and hairy, brown. Anal plates blackish. 

 Beneath with sternum and coxae blackish. Length of body 2.65 mm., to 

 tip of wings 4.40 mm. 



On snowball {Viburnum opulus var. roseus). Ashland. On 

 April 27 the viviparous female was found and upon visiting the 

 place the last of May no lice of any kind could be found. In 

 September and October they again appeared. It was at this time 

 that the 6-jointed forms were found. Joint II divides and forms 

 III and IV of the winged form. This same variation was no- 

 ticed in the plum aphis this year. 



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

 95, 96) and of the U. S. National Museum (nos. 317, 318). 



76. Aphis yuccicola n. sp. 



Apterous form: Green. Antennae but little more than half the body in 

 length, pale at base, dusky to black toward the tip. Head small. Abdo- 

 men green, with transverse bands and marginal dots. Honey tubes and 

 tail black. Legs pale with dusky joints and tarsi. Beak reaching to or 

 beyond the third pair of coxae. 



Pupa: Similar to the apterous form in color, but with head larger, honey 

 tubes and tail shorter and size smaller. Wing-pads black. 



Winged form: Antennae but little more than half the body in length, 

 black, pale at base; III longest. Head black. Eyes dark red. Neck 

 green. Prothorax dark green to brown, with lateral tubercles. Thorax 

 black. Wings with broad rounded tips, slender brownish veins ; second 



145 



