216 Transactions. — Zoology. 



From bark of manuka {Leptospermum). 



I am not sure that this is not perhaps a variety of M. pyriformis. At 

 the same time the differences are considerable. The two median abdominal 

 lobes of M. leptosperyni are much more conspicuous than those of M. pyri- 

 formis ; the groups of spinnerets are always distinct, and the single spinne- 

 rets usually wanting. The structure of the puparium is also different, but 

 I would scarcely lay specific stress on this. In M. pyriformis, which I have 

 hitherto found only on leaves or bark of soft- wooded plants, the whole 

 secretion from the spinnerets is built up into the puparium in transverse 

 fibrous layers, apparently without direct admixture of the vegetable sub- 

 stance of the plant. The bark of the manuka probably lends itself more 

 readily to the purposes of M. leptospermi, which seems only to cement 

 together with its secretion a number of the bark-cells scaling off the tree ; 

 and the fibrous secretion may be made out intermixed with these cells, which 

 are always arranged longitudinally. 



2nd Genus, Chionaspis, Signoret. 



This genus has been separated from Mytilaspis on account of the form 

 of the male puparium. In Mytilasjns the male and female puparia are alike; 

 in Chionaspis the female has a broad and pyriform, the male a narrow and 

 usually carinated, puparium. 



1. Chionaspis dubia, sp. nov. 



Puparium of female white, flat, very thin, pyriform, the two pellicles 

 comparatively small. 



Adult female generally resembling Mytilaspis, but with somewhat deeper 

 corrugations towards the abdominal end. Abdomen ending with a median 

 depression as in Diaspis rosm (Trans., vol. xi., p. 201) : no terminal lobes. 

 Five groups of spinnerets ; upper group with 6-10 orifices, the rest 10-15. 



Male puparium white, elongated, irregularly oval, flat above, but with 

 two keels on the under side, enclosing a longitudinal semi-cylindrical groove 

 as in Fiorinia astelia, mihi. 



Adult male reddish colour, generally normal form of Diaspids. Antennae 

 hairy, 10-jointed, the first two joints very short. Feet normal, with four long 

 fine digitules. At the base of the abdominal spike is a somewhat large 

 tubercle. Haltere of the general form of Mytilaspis (see fig. 4), but the 

 terminal seta is very long, four times as long as the thick basal portion, and 

 has no terminal knob. Thoracic band conspicuous. The thorax is some- 

 what long, so that there is a considerable distance between the first and 

 second pairs of legs. 



Common on many plants, Coprosma, Rubus, Asplenium, etc. 



The species of Chionaspis seems to be by no means clearly differentiated. 

 The present insect resembles in some particulars C. aspidistra:., Signoret, C 



