Maskell. — On Coccididae. 145 



Hab. In New Zealand, on Fagus cliffortioidcs, Eeefton 

 district. 



The peculiar appearance of the second stage in this species, 

 its bright-green colour with black spots, and its smooth skin, 

 render it easily recognisable. The arrangement of the spines, 

 itc, is of course not to be clearly made out until the insect has 

 been treated with caustic potash or some other reagent. 



Genus Eriococcus, Targioni-Tozzetti. 



I adhere to the plan by which this genus is separated from 

 lihizococcus by the construction of a cottony sac. It will be 

 seen presently that, until further inquiry, I leave also separate 

 the genus Gossyparia, in which the distinction has been made 

 to depend only on the quantity of cotton excreted. Such a 

 distinction will not, perhaps, be always retainable, as observa- 

 tion of Coccids in many countries extends ; but the genus 

 Eriococcus will, I think, be permanent. 



Eriococcus raithbyi, sp. nov. Plate IX., fags. 1-18. 



Sac of adult female orange-yellow, rather lighter-coloured 

 at the extreme abdominal end ; elliptical ; convex ; very closely 

 felted, smooth and solid in appearance ; length averaging 

 about xV^- 



Sac of male pupa orange-yellow, lighter-coloured at the 

 abdominal end ; cylindrical, slightly convex, narrow ; closely 

 felted, like that of the female ; length about Yjin. 



Adult female dark-yellow or red, becoming darker after 

 gestation ; at first almost filling the sac, afterwards gradually 

 shrivelling as she becomes void of eggs. Before gestation 

 elongated, ovate, segmented, convex ; anal tubercles small 

 but distinct, setiferous ; anogenital ring with eight hairs ; at 

 the base of each tubercle are three or four spines, and another 

 spine near the tip. Antennae of seven subequal joints, the 

 third and seventh being a little the longest ; a few hairs on 

 each joint. Feet with rather thick femur ; on the trochanter 

 a long seta ; tibia and tarsus slender, tibia shorter than the 

 tarsus ; digitules four, strong hairs with largely-dilated ends. 

 Mentum dimerous (?). On the dorsum a number of small 

 spinnerets — some simple circular orifices, others very minute 

 spiny hairs. On the edges of the segments some very small 

 fine hairs. 



Female of second stage yellow, elliptical, convex, segmented ; 

 anal tubercles conspicuous, setiferous. Antennae of six joints 

 the third and sixth a good deal longer than the others. 

 Feet rather short and slender. On the edges many spiny 

 hairs, stronger than those of the adult. There is a thin white 

 meal on the body. 



Larva orange - yellow ; elliptical ; flattish ; segmented ; 

 10 



