The Aphididae of Nebraska 47 



quite variable; in some specimens the third is subequal to the preceding, 

 while in others it is one third longer. VII filiform, very much longer than 

 III. Honey tubes somewhat dusky, gently tapering from base to apex, 

 apical diameter about two thirds that of the base, about three times as long 

 as the tarsi. Tail dusky yellow, blunt at apex, when fully extended about 

 half the length of the honey tubes. Fore wings hyaline; stigma dusky 

 yellowish, acute at apex, which is opposite the middle of the stigmal vein. 

 Stigmal vein in one regular curve. Discoidal veins of hind wings nearly 

 parallel; subcostal comparatively straight. Length of body 1.65-2.03 mm., 

 to tip of wings 3.04-3.54 mm. (Monell). 



On milkweed (Asclcpias iticarnata and A. syriaca). Elmwood, 

 Lincoln, Ashland. June-September. 



Specimens in the collection of the U. S. National Museum 

 (nos. 89, 90). 



58. Aphis maidis Fitch. 



Pitch, Ins. N. Y., I, p. 318 (1856). 

 Thomas, Ins. 111., 8th Rep., p. 89 (1879). 

 Garman, Ins. 111., 14th Rep., p. 23 (li 

 Garman, Misc. Es. Ec. Ent, p. 46 (i£ 

 Oestlund, Syn. Aph. Minn., p. 56 (1887). 



ROOT FORM 



Apterous viz'iparous female: Head black above. Prothoracic segment 

 black, the following three body segments each with a transverse dusky 

 mark on their middles. Abdomen pale green, with black marginal spots 

 and with numerous smaller specks over the surface. Antennae dusky at 

 tip and slightly also at base. Eyes reddish brown. Honey tubes black. 

 Tail dusky, preceded by two transverse black marks. Abdomen beneath 

 with two transverse black marks before the tail, otherwise nearly uniformly 

 pale green below. Beak black at base and tip. Coxae, femora chiefly, tips 

 of tibiae and tarsi black. Body widely oval in outline. Antennae short, 

 about half the length of the body and head; I and II equal in length; I 

 largest; III longest; IV and V subequal and about equal to VI. Honey 

 tubes short, tapering toward the tip, not swollen, extremities flared. Tail 

 short and wide. Length of body 1.40 mm., width of body 0.93 mm., an- 

 tennae 0.57 mm. 



Pupa: Head obscurely dusky. Thorax obscure reddish brown. Abdomen 

 pale, dull green, without spots. Antennae dusky at tip only. Eyes red- 

 dish brown. Wing-pads obscurely dusky. Honey tubes black. Tail dusky. 

 General color below greenish. Beak dark at base and tip. Tarsi and tips 

 of tibiae dusky. Length of body 1.61 mm., width 0.30 mm. 



Winged oviparous female: Head black. Thorax brownish black. Abdo- 



13' 



