Maskell. — On Coccidse. 49 



clear about the Adelaide Crotons : yet of course there might be 

 Citrus trees in the vicinity. 



Genus Chionaspis. 

 Chionaspis prunicola, sp. now Plate II., figs. 3-5. 



Female puparium whitish, very broadly pyriform, the 

 margin widening so directly from the first pellicle that the 

 whole seems almost elliptical or even subcircular. Length 

 about T^in. The white secretion seems to be easily rubbed 

 off, and" the yellow or yellowish-brown pellicles are exposed. 

 The first pellicle is rather small, terminal ; the second appears 

 to occupy about half the puparium. The insects are fre- 

 quently so massed together on the plant that it is very diffi- 

 cult to make out the exact form. 



Male puparium white, the pellicle yellow ; form elongated, 

 with parallel sides ; length, about ^in. The secreted portion 

 is carinated, but the single median carina is by no means con- 

 spicuous, and may be easily overlooked. 



Adult female yellow or yellowish-brown, very little elon- 

 gated ; the cephalic and thoracic regions large in comparison 

 with the abdominal, which tapers rapidly. Abdomen termi- 

 nating in two median lobes, which are triangular with broad 

 bases and crenated sides : on each side of these is a small 

 cylindrical lobe with rounded end, followed by a short spine ; 

 then an interval followed by two small triangular lobes : the 

 margin of the abdomen is serrated. Five groups of spinnerets : 

 upper group, 14-20 orifices ; upper laterals, 28-34 ; lower 

 laterals, 20-26. There are three or four rows of large oval 

 pores on each side, marking the abdominal segments. 



Adult, male unknown. 



Hah. In the Sandwich Islands, on "Japanese plum" : 

 specimens sent by Mr. Koebele, who informs me that the 

 plants have been destroyed by the insects. I presume there- 

 fore that the insect comes originally from Japan. 



It is difficult to make out the real form of the female 

 puparium in this species, which very frequently approaches 

 that of a Diaspis, in its elliptical or subcircular outline. 

 But the form of the adult female agrees much better with 

 Cluonaspis ; and I think there is no known species of Diaspis 

 exhibiting rows of large oval pores. On the whole, I shall 

 leave it as a Chionaspis. In some of its characters it seems to 

 approach closely to Ch. lintneri, Comstock (2nd Cornell Univ. 

 Eeport, 1383, p. 103). 



Chionaspis biclavis, Comstock, var. detecta, var. now 



Female puparium greyish-white, somewhat solid, broadly 

 pyriform or subelliptical ; pellicles inconspicuous ; length 

 about jV 0, 



