230 



THE CANADIAN ENTOMOLOGIST 



Winged \-iviparous female: Head and thorax black, abdomen pale green 

 with three dusky spots on each side anterior to the cornicles and one at the base 

 of the cornicles, an impressed dusky dot on each side of each segment, a brighter 

 green transverse area on each side of the dorsal median line of the segments 

 anterior to the cornicles, a small dusky spot on the dorsal median line of the 

 cornicle-bearing segment, and a similar transverse dusky to blackish marking 

 on the penultimate and last abdominal segments. Antennae black. Eyes 

 dark reddish brown. Beak black at tips. Legs with femora pale dusky to 

 blackish at tips, tibiae brown to blackish at tips and tarsi black. Cornicles, 

 Cauda, and anal plate black. 



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c 



B 



Fig. 28. — Aphis cuscutse, n.sp. A, antenna; B. cornicle, of winged viviparous female; 

 C, cornicle of wingless viviparous female. 



Antennae reaching about to base of cornicles, segments III and filament of 

 IV subequal, the former being slightly the longer, III subequal in length to IV 

 and V combined, segment III with about 40 to 50 circular, slightly tuberculate 

 sensoria scattered irregularly over the surface, and the usual sensoria at distal 

 end of segment V and VI base (fig. 3a). Beak not quite reaching to coxae of 

 the middle pair of legs. Wings normal, veins narrow, and blackish, the branch- 

 ing of the third discoidal nearer the tip than point where second branches. 

 Cornicles moderately long and reaching just a little beyond tip of body in live 

 specimens (fig. 3b). Cauda typical of the genus, being slender, conical and 

 constricted near the middle. The prothorax with a tubercle which is hidden 

 by the mesothorax in mounted specimens; also a rather prominent tubercle on 

 each side of the first abdominal segment. 



Measurements: (Averages) Length of antennal segments III, 0.508; IV, 

 0.238; V, 0.228; VI, base, 0.122; VI, filament, 0.405 mm.; cornicles 0.379 mm.; 

 Cauda, 0.151 mm. 



Pupa: Head dusky, thorax pale yellowish green and abdomen marked as 

 in apterous form, but lacking the black markings and bearing a row of rather 

 conspicuous pulverulent spots on each side of the median dorsal line, and the 

 entire body covered with a fine inconspicuous pulverulence. Antennae dusky to 

 blackish, excepting segment III and base of IV, which are whitish. Eyes dark 

 reddish brown, almost black.. Beak not quite reaching coxae of middle pair of 

 legs. Wing-pads blackish at tips. Legs whitish, the tips of tibiae and femur 

 and all of the tarsi blackish. Cornicles black and not quite reaching to tip of 

 Cauda. Cauda pale with an almost imperceptible duskiness. 



Wingless viviparous female: General colour pale green (Smith colour key) 

 and entire body covered with a very thin pulverulence. Head and prothoracic 

 segment dusky to blackish, second thoracic segment dusky on either side of 

 dorsum and a fainter dusky area connecting the two. Abdominal segments 



