28 Thomas Albert Williams 



darker green markings, these often running together, giving the insect a 

 dark green color. Head and spot on each side of the prothoracic segment 

 brown. There is generally a yellow median stripe running the entire 

 length of the body; on each side of this line are three rows of small 

 brown tubercles, and on the margin of the abdomen is one or more rows 

 of larger brown tubercles with one to several hairs proceeding from each, 

 and sometimes there is a marginal row of brown spots along with the 

 tubercles. Antennae about half as long as body, dusky, VII longer than 

 III. Legs short, hairy, dusky yellow. Honey tubes very short, hardly 

 raised above the surface of the abdomen, brown. Tail not noticeable. 

 Length of body l.8o mm. 



Apterous oviparous female: Ovate, dark brownish green; a yellow me- 

 dian line and some yellowish markings between the segment bands, espe- 

 cially on the thorax and behind the honey tubes. Dorsum tuberculate, 

 hairy. Eyes very dark red. Legs and antennae as in viviparous female, 

 but darker colored generally. Honey tubes short, brown, with a yellow 

 ring around the base on the abdomen. Tail short, yellow, knobbed. Length 

 of body 1.50 mm. 



Winged male: Head and thorax shining black. Antennae almost as 

 long as the body ; pale at base, dusky to black toward tip. Beak not reach- 

 ing middle coxae. Front pair of legs yellowish with femoral tips and 

 tarsi dusky ; middle pair with more duskiness ; hind pair with femora 

 blackish, tibiae all yellow but tip; tarsi dusky. Wings with yellowish 

 insertions, subcostal and stigma, and prominent, blackish oblique veins. 

 Abdomen greenish yellow, with a central longitudinal band of greenish 

 brown, widening behind (it is formed by short transverse bands on each 

 segment which run together more or less) and numerous small dots on 

 each side of this ; sometimes darker marginal spots can be seen, but these 

 are variable. Honey tubes longer and paler than in the other forms. 

 Tail as in oviparous female. Length of body 1.80 mm., to tip of wings 

 3.15 mm. 



On willow (Salix sp.). Ashland, October 10, 1890. The 

 winged viviparous female was not found, but Kaltenbach de- 

 scribes it as being similar to my winged male. 



Specimens in collection of the University of Nebraska (nos. 

 33, 34) and of the U. S. National Museum (no. 47). 



29. Chaitophorus spinosus Oestlund. 



Oestlund, List Aph. Minn., p. 49 (1886). 



Oestlund, Syn. Aph. Minn., p. 38 (1887). 

 Apterous viviparous female: Greenish yellow, with a large dorsal spot 

 of dark green, which is often more or less broken up into transverse bands. 

 Whole dorsum covered with black spine-like hairs proceeding from tuber- 



112 



