54 KANSAS UNIVERSITY SCIENCE BULLETIN. 



branched, and, where twice branched, quite near the distal end 

 of the vein, as shown in the illustration ; total expansion, 5.80 

 mm. Legs black except at the proximal ends, which are 

 lighter in color. Coxj^p are black. 



Abdomen mostly dusky green ; two transverse dark bands on 

 the first two segments cephalad the honey-tubes. Also three or 

 four dark patches along the margins cephalad the honey-tubes. 

 Latter dark, incrassate, constricted near the apex, expanding 

 again at apex to the original diameter, being 0.18 mm. long. 

 Style hirsute, dark except at the base, which is concolorous 

 with the abdomen, about 0.10 mm. long, or equal to tarsi or half 

 the honey-tubes in length. Entire body, 1.45 mm. long. 



This form is found on the hawthorn [Craixgus tomentosa) . It 

 hatches from the egg March 15, is gregarious in habit and 

 quite numerous, colonizing both sides of the leaves. The 

 dorsal side was affected in July and greatly corrugated, but in 

 October the form was more sporadic on the ventral side of the 

 leaves. 



Aphis brassicae Linn. Plate X, fig. 61. 



Head blackish. Antenmp dark, imbricated, and slightly 

 hirsute; joint I, 0.05 mm.; II, 0.07 mm.; Ill, 0.70 mm. ; 

 IV, 0.28 mm.; V, 0.32 mm.; VI, 0.14 mm., and joint VII, 

 0.54 mm. long. Total length, 2.10 mm., extending twice the 

 length of the honey-tubes beyond the abdomen. Sensoria of 

 third joint circular, of moderate size, irregularly placed, and 

 about fifty in number. One sensoria near distal end of fifth 

 joint. Six small and one large sensorium on sixth joint at the 

 union of the seventh. Total length of antennae, 1.81mm. Eyes 

 black. Ocelli prominent. Beak darker at the distal end than 

 near the base ; it extends to the second coxa and is 0.36 mm. 

 long. 



The prothorax is dark, especially along the margins. Thorax 

 is black. Wings are hyaline, venation brownish, with a border 

 of a smoky tinge, also rather coarse except stigmal vein, which 

 is also clearer in color. Stigma is dark brown, 0.90 mm. long 

 and 0.16 mm. broad. Total wing expansion, 11.60 ram. Legs 

 dark brown, lightest at the proximal part of the femur. Meta- 

 thoracic legs smaller than the others. 



Abdomen greenish gray, and pulverulent. When this pul- 



