December, '19] wEiss AND dickerson: macropsis virescexs 437 



Sexes 



The sexes which have not before been described appear upon the 

 bushes in September and October and eggs are laid (in confinement) as 

 early as the first week in October. Both sexes are apterous, the males 

 being very small. Descriptions of the sexes follow: 



Male 



Fifth Instar (adult) .-r-In general color the male does not differ greatly from the 

 other apterous forms though it is darker, the antennaj being quite dusky. Average 

 measurements are as follows: Antennal segment I, 0.064 mm.; II, 0.048 mm.; Ill, 

 0.256 mm.; IV, 0.16 mm.; V, 0.144 mm.; VI (0.048+0.256 mm.). The segments 

 are armed with short, rather stout hairs and with small circular sensoria. These 

 last number about as follows: Segment III with 14 or 15 of uneven size and irregu- 

 larly placed over the segment, IV with usually 6, V with about 5. In some cases 

 segments III and IV are united and measure about 0.356 mm. and possess about 

 22 irregularly placed sensoria. Cornicles short, not more than 0.096 mm., subcyUn- 

 drical, shghtly swollen near their distal extremities. Hind tibia; about 0.624 mm. 

 Cauda 0.096 mm. Length from vertex to tip of Cauda 0.96 mm. 



OVIPARA 



Fifth Instar (adult). — General color very similar to that of the viviparous form, 

 the one or two large eggs within showing very distinctly through the abdominal wall. 

 Average measurements as follows: Antennal segment III, 0.176 mm.; IV, 0.112 

 mm.; V, 0.112 mm.; VI (0.064+0.272 mm.). The antennae are without second- 

 ary sensoria but the segments are armed with short rather stout spine-like hairs. 

 Cornicles 0.144 mm., almost cylindrical, distinctly imbricated, possessing, however, 

 quite a marked flange and a considerable constriction just proximad of it which gives 

 the cornicle the appearance of being slightly swollen. Cauda about 0.128 mm. 

 Hind tibia not distinctly swollen but armed with a small group of sensoria on its 

 proximal quarter, length of tibia 0.544 mm. Length from vertex to tip of Cauda 

 about 1 mm. 



THE LIFE HISTORY AND EARLY STAGES OF MACROPSIS 



VIRESCENS VAR. GRAMINEA (FABR.),^ A POPLAR LEAF 



HOPPER IN NEW JERSEY (HOM.) 



By Harry B. Weiss and tocAR L. Dickerson, New Brunswick, N. J. 



The following notes are the results of observations made at various 

 times during the past several years on Macropsis virescens var. gram- 

 inea which was fairly abundant on Loinl)ardy poplars growing in a 

 nursery at Irvington, N. J. 



The species overwinters in the egg stage, the eggs being found in 

 two year old wood, usually in the neighborhood of the buds near the 

 end of the growth, although some eggs were found in the twig tissue 

 betw(?cn the sets of buds. The eggs are inserted singly on their sides 

 just beneath the bark tissue and the l)ark over the egg is raised showing 



1 Identified by K. \\ \':iii Duzcc. 



