294 MAINE AGRICULTURAL EXPERIMENT STATION. 1917. 



ency. There is a deep purplish area (internal) at the base of 

 each cornicle. Tibiae and base of antennae pale, cauda and 

 cornicles black. Cornicles with constriction before flange with 

 perhaps a suggestion of constriction at middle. Beak short, 

 scarcely reaching second coxae. 



Alate viviparous female : Head and thoracic lobes glis- 

 tening black, general body color dark olive green. Breastplate, 

 anal plate, cauda and cornicles black. Cornicles constricted 

 before flange and tendency toward a very slight midconstriction. 

 There are three large, heavy, black spots along lateral line of 

 abdomen cephalad the cornicles, and an irregular black patch at 

 base of cornicle, caudad. The second branch of M is typically 

 near margin of the wing, though there is considerable variation in 

 the length of this branch. The shape and length of stigma is 

 variable but it is always pointed and rather elongate. The rela- 

 tive length of the antennal segments and the number of sensoria 

 are also unstable factors. The drawings show what is a good 

 average. Sensoria are always present on III (25 more or less), 

 and IV (10 more or less) and usually on V (a few). The beak 

 reaches about half way between first and second coxae. 



Spring nymph developing to alate female : The newly 

 dropped or newly molted nymph is yellowish or pale brown, with 

 rusty area (internal) at base of cornicle. The nymph soon colors 

 to dark olive green. 



INSTAR ANTENNA BEAK 



1st- 4-segmented just caudad 3rd coxae 



2nd. 5-segmented reaches 3rd coxae 



3rd. 6-segmented . 2nd coxae or beyond 



4th. (pupae) 6-segmented not reaching 2nd coxae. 



In the pupal instar this nymph is dark olive green, with five 

 lateral powder spots on each side of abdomen cephalad cornicles 

 and a solid powder area caudad the cornicles. Powder spots are 

 present on base of head and on prothorax. There is a dark 

 rusty area at base of cornicle due to internal substance showing 

 through the body wall. Cauda is pale at base with black tip, 

 and the cornicles are black. 



