78 THE SPRIXG GEAIX-APHIS OR " GEEEX BUG. 



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constricted above the middle, about two-thirds the length of the cornicles. Tibia 

 of hind leg (fig. 10) swollen and thickly covered with sensoria-like swellings. Lateral 

 tubercles small and single. 



Winged male. — Expanse of wings about 4.5 mm.; length of body about 1.3 mm. 

 General coloration of the abdomen yellowish green; head brownish-yellow; eyes 

 black; antennae black, except the two basal joints and the proximal half of the third, 

 which are yellowish green. Legs yellow, the femora more or less dusky, the posterior 

 pair darkest; apex of the tibia and tarsi black; cornicles yellowish, with black apex; 

 cauda yellowish. Wings, costa and subcosta yellow; stigma paler, the inner edge of 

 the stigma and the veins black. Antennae long and slender, reaching to or a little 

 beyond the end of the body; third joint with about twenty circular sensoria; fourth 

 with about eighteen; fifth with about nine. Cauda slender, somewhat constricted 

 about the middle, as long as the cornicles. Lateral tubercles small and single. 



To this description we add the following: 



Oviparous femaU. — Measurements of antennal joints (average from eight indi- 

 viduals): I, 0.067 mm.; II, 0.050 mm.; Ill, 0.229 mm.; IV, 0.166 mm.; V, 0.172 mm.; 

 VI, base 0.095 mm.; VI, filament, 0.369 mm.; total length, 1.148 mm. 



Male (average from six individuals) (fig. 6): 1,0.064 mm.; II, 0.051 mm.; Ill, 0.361 

 mm.; IV, 0.243 mm.; V, 0.242 mm.; VI, base, 0.107 mm.; VI, filament, 0.407 mm.; 

 total length, 1.475 mm. 



We find also that the coloration of the oviparous female varies 

 considerably from almost a clay-yellow with a faint tinge of green 

 to a deep green. Individuals are somewhat pruinose also. As they 

 become older the legs and bases of the antenme get darker; each 

 margin of the base of the cauda becomes quite dark. 



The abdomen of the male varies somewhat in color from deep 

 apple-green to pale green: the thoracic plates, dorsally and ventrally, 

 :.ro of an olive color. 



MOLTING. 



As stated on page 62 Mr. Vickery, of this bureau, conducted some 

 experiments at Richmond, Ind., in 190S, to ascertain the number of 

 molts for the sexes. He selected 6 individuals just as they were 

 born and isolated each in cages as heretofore described. Three 

 proved to be males and 3 oviparous females, all of winch molted 

 4 times. Also, at La Fayette, Ind., in 1909, the junior author found 

 that the oviparous forms molted 4 times. 



OVIPAROUS DEVELOPMENT. 

 AGE AT WHICH FEMALES BEGIN OVIPOSITION. 



The age at which females begin depositing eggs varies greatly 

 according to weather conditions. From 11 to 41 days are required 

 for them to become adult. If they happen to be born the last week 

 in September or the first week in October the chances are that they 

 will become adult within about 11 days. If they have the misfor- 

 tune to be born the last week in October or during November it 

 ma}' take them over a month to reach maturity; perhaps they would 





