86 APHID NOTES 



produce alive a number of pale whitish young, which develop 

 into apterous viviparous females and are the first of a series of 

 summer generations. 



In the fall, part of the aphids then present on the roots migrate 

 to the ash and produce alive the sexual forms. Those remaining 

 do not acquire wings but continue feeding, and one can find these 

 apterous viviparous forms present on the roots in all stages 

 throughout the year. The sexual forms are minute, brownish, 

 and have no mouth parts. After copulation, each female pro- 

 duces a single elongate egg. In this stage the insect is carried 

 over the winter on the ash. 



A second species which has been imported into this state (Oregon) 

 on red and white ash, the writer is calling Prociphilus humeliae 

 Schrank. This species seems to be entirely distinct from the 

 first species, in that it feeds on the tips of the shoots and does not 

 ordinarily get on to the leaves. The stem mothers of the two 

 are quite similar, but the migratory forms show a decided differ- 

 ence in several ways. A description of the various stages of 

 Prociphilus fraxini-dipetaliae Essig follows : 



Stem mother: Globose, body nearly as wide as long. General color choco- 

 late brown and mottled with green above. Sutures between body segments 

 dark green. Head and legs black, antennae black at the base, light brown 

 toward the tip. Each eye is composed of three smaller eyes. The wax plates 

 on the head are very variable in that the two larger ones at the base of each 

 section of the occiput oftentimes merge into one long plate, the smaller ones 

 varying in number from five to six, and apparently without regular size or 

 position. Those on the body are in series of six to each segment and are more 

 or less regular in position. 



Measurements: Length of body, 4 mm.; width, 2.75 mm. Length of anten- 

 nal segments, I, 0.09 mm.; II, 0.11 mm.; Ill, 0.176 mm.; IV, 0.11 mm.; V, 

 0.09 mm.; VI, 0.135 mm.; spur, 0.05 mm.; total length, 0.75 mm. 



Pupa: General color lemon yellow, except the v/ing pads which are dusky. 

 The entire body above is covered with long waxy white threads which have a 

 blue tinge. When they are about ready to change to alate forms, they become 

 a Httler darker in color with occasional pinkish and bluish variations. Each 

 abdominal segment with a row of six oblong wax plates. Cauda, short and 

 broad, rounded at the tip. Color black to dusky. Length of body, 3 to 4 

 mm.; width, 2 mm. 



Spring migrant (Plate V, fig. l): General color blui.sh green with the entire 

 body pulverulent. The legs, antennae and thorax are bluish l)lack ; the abdomen 

 is dark greenish blue. On account of the fact that the waxy threads on the 

 body of the insect are easily rubbed off, it is hard to tell just how nmch of this 



