88 THE SCOTTISH NATURALIST 



the dorsal surface and bearing numerous very minute 

 chitinous processes which are arranged in lines forming 

 an irregular reticulate pattern as figured (Fig. 2, C). 

 Cornicles black, faintly imbricated, broadest at the base, 

 thence narrowed, but slightly swollen two-thirds from the 

 base and again narrowed before the apex. Cauda very 

 short, only three-eighths the length of the cornicle and 

 similar in shape to that of the alate female (Fig. 2, B). 

 Anal plate widely V-shaped at the apex ; beset like the cauda 

 with numerous small chitinous points and with several long 

 hairs. Legs dark brown, with the tibise and the base of the 

 femora paler. Length of femur 0-49 mm. to 0-54 mm. ; 

 tibia 0-77 mm. ; tarsus 0-09 mm. to o-i2 mm. Under-siirface 

 brownish black. 



Length 2-4 to 2-5 mm. 



Alate Viviparous Female. (Fig. i. A, 

 and, Fig. 2, B, E, and F.) 



Red, abdomen with darker markings, head and thorax 

 brownish black. Antennce brown, 3rd segment with from 

 twenty-eight to thirty-five sensoria with double contour, 

 4th with eight to ten, 5th with five, 6th with primary 

 sensorium and a few small sensoria beside it. Proportions 

 of segments 14, 11, 61, 36, 28 (164-59). Total length 

 1-52 mm. to 1-55 mm. Head similar in shape to that of 

 alate male (Fig. 2, A), with several short bristles, the latter 

 present also on thorax and abdomen. Wings normally 

 aphidine, with veins distinct. Abdomen light red, the first 

 two segments each with a narrow transverse band of darker 

 red on the dorsum. Remaining abdominal segments pre- 

 ceding the cornicles suffused with dark red upon the dorsum 

 but with a narrow stripe of the lighter ground colour along 

 each side and sometimes a row of darker blotches beneath 

 it. Under-snrface dark red. Cornicles black, slenderer than 

 in the apterous female but more swollen about the centre. 

 Cauda dark red. Legs, first pair ochreous, with the tarsi 

 and the apices of the femora and of the tibise brown. The 

 second and third pairs are similar to the first, but have the 

 femora dark brown (excepting at the base), and the apices 



