APHIS ATRIPLICIS. 89 



tliough by no means less tigUy organized, is tlie most 

 diminutive of all. 



Apterous male. 



Inch. Millimetres. 



Size of body 0-045x0-012 I'lSxO'SO 



Greenish yellow. Head and thorax very broad. 

 Head and bands on the pro- and post-thorax black. 

 Antennae as long as the body ; third joint tuberculate, 

 seventh joint serrated. Abdomen long-oval ; carina 

 with three or four black spots ; dorsum with three 

 longitudinal rows of the same colour, widening towards 

 the tail into bands. Legs, antennge, and cornicles 

 smoky-grey. Genito-anal apparatus largely developed. 



The whole insect is more slim and delicate in form 

 than any of the others. 



Apterous ovijMrous female. 



Inch. Millimetres. 



Size of body 0-060x0-035 l-52x0-88 



Long-oval, smooth, glaucous green. Head with two 

 occipital smoky spots. Eyes, antennae, legs, and cor- 

 nicles smoky-grey. Cauda obtuse. Several specimens 

 contained three large eggs. 



On searching some leaves of Atriplex, which were 

 closely rolled up in the direction of their length, I 

 found a clehris of empty skins — old exuvias, perhaps to 

 the number of thirty. Amidst this mass two females 

 were resting. They had already laid three eggs, one 

 of which was black, and the others yellow, the last 

 obviously very recently deposited. 



The position of these eggs within dry leaves suggests 

 the probability, that long after the latter have been 

 shed they are carried about, with their contents, by 

 the winds into other spots. Yet, if this be so, many 

 individuals after hatching out must never arrive at 

 maturity, from the want of necessary food. 



