84 



J. DAVIDSON. 



Thorax with two prominent lateral tubercles on prothorax. 

 somewhat lons^er than in a. v. 2, otherwise similar. 



Wings normal. Legs 



Abdomen varying in colour frolm dark velvet-black to olive-green, usually with five 

 irregular pigmented areas along the lateral dorsal area and irregular transverse areas 

 segmentally arranged ; lateral tubercles prominent. Cornicles black, varying in 

 length, usually about one and one-half times length of caudaas viewed from dorsum, 

 imbricate, tubular, slightly tapering distally. Cauda not so large as in a. v. $, other- 

 wise similar. Anal and genital plates as in a. v. 2. 



4. Sexup.-\rae. 



{a). Male-producing sexuparae, apterous, resembling apterous viviparous female. 



{h). Female-producing sexuparae, winged, resembling winged viviparous female, 

 but somewhat larger in size. 



5. Male (fig. 4). Average size, 1-4 mm. by 0-7 mm. 



Body smaller than in w.v. $, narrower and more tapering distally ; seen from 

 dorsum it appears to be shining black, but the abdomen is often very dark green ; 

 small hairs scattered over the body. 



Fig. 4. Aphis riimicis, ^ : (18) dorsal view; (19) antenna; 



(20) rostrum ; (21) cornicle; (22) tarsus of third leg ; (23) posterior 



end of venter, showing genital armature, a. p., anaf plate, c, cauda, 



cL, claspers, p.s., penis sheath ; (24) cauda, dorsal view. 



Head black. Eyes large, black ; acce.ssory eves prominent. Antennae about 

 two-third to three-quarters length of body, black, "but sometimes paler ; segments 1 

 and 2 subequal ; 3 shorter than 6 ; 4 slightly shorter than 3 ; numerous subcircular 

 sensoria on segments 3, 4 and 5, and a compound sensorium on B ; a few hairs on all 

 segments. Rostrum normal. 



Thorax black and shining ; prothoracic tubercles prominent. Legs slender, black, 

 with greater part of tibiae and femora paler ; hairs on all segments, especially tibiae! 



Abdomen varying, almost black to dark green, black along lateral margins, irregular 

 patches of darker pigmented areas more or less segmentally arranged ; two lateral 



