AKT. 20 THE APHID GENUS AMPHOROPHOEA MASON 



Other measurements 



21 



Color notes {Pergande MSS.). — "October 30, 1899, the winged form 

 is pale yellowisli green, with the head, antennae, thoracic lobes, lateral 

 spot in front of anterior wings, sternal plate, lateral spots in front of 

 nectaries, apex of femora and tibiae and tarsi black; a broad dusky 

 band across pro thorax; a dusky band about the middle of the abdo- 

 men, the more or less confluent bands in front of nectaries, or all three 

 may be joined laterally, forming an angulated edge; the last band 

 is joined posteriorly by two, posteriorly diverging, stout branches 

 between the nectaries; no bands behind them, though there are two 

 dusky lateral spots behind the nectaries, the anterior one much the 

 largest. Legs, nectaries and tail yellow, the apex of the nectaries 

 dusky. Stigma very pale dusky, subcosta yellowish, veins blackish. 

 November 10, 1899, found again a number of apterous and one 

 winged female, the latter being considerably larger than those found 

 October 30, with the spots on the abdomen larger and deep black, 

 though structurally they are all alike. Found also two migrants, 

 larvae and pupa on Lactuca canadensis. The migrants are smaller 

 than the one on Sonchus though otherwise alike." 



Apterous viviparous female (Summer Form 07i Sonchus). — Antennae 

 about equaling length of body, hairs small, heavy. III with a row of 

 5 to 20 sensoria, distal segments imbricated, I and II gibbous on 

 inner side. Antennal tubercles fairly large and prominent. Beak 

 reaching slightly beyond second coxae. No dark patches or tubercles 

 showing as in alates. Cornicles short, plainly swollen, with about 



