294 Tranmctio ns . — Zoology . 



digitules are only long fine hairs ending in minute knobs. The thoracic 

 band occupies about half the width of the body. The abdominal spike is 

 long and, as usual, hairy. There is indeed not much difference in the 

 males of most species of the Diaspidse. The male of Poliaspis is not greatly 

 unlike that of A&pidlotus epidendri, or of Diaspis gigas. 



Poliaspis media, which I have from a Veronica and from Leucopogon 

 fraseri, is the species alluded to in my former paper,* and which I had not 

 then sufficiently examined. 



4. CcELOSTOMA, gen. nov. (?). 



The insects which I have just described belong to the group Diaspidse ; 

 my nest belongs to the group Coccid^, subsection Monophlebidae. 



In my former paper I mentioned, as characteristic of the group Coccidae, 

 a bi- or tri-articulate mentum, and in the synopsis attached to this paper I 

 give, as a characteristic of the Monophlebidae, antennae of eleven joints, a 

 number found in no other subsection of the group. The genus Cmlostoma 

 possesses this last character, but it presents the unusual feature of having a 

 mouth formed of only a hollow opening, without any mentum, rostrum, or 

 buccal setffi. 



There is a subsection of the group Coccidae known as " Porphyroplwra" 

 Brandt [Porpli. polonica used to be much employed in Europe as a dye), 

 where not only the rostrum and setaa are absent, but there is absolutely in 

 the adult female no trace of a mouth at all ! In what manner Porphyro- 

 pihora contrives to extract its nourishment from the plants it lives on I do 

 not know. The males of all Coccidae are destitute of mouths, and it may be 

 presumed that their office is merely to impregnate the females. But how 

 these latter, if mouthless, are enabled to live and grow fat during the period 

 of gestation is not clearly intelligible. But as Ccelostoma possesses, at any 

 rate, an oesophagal opening, I must include it amongst the MonophlebidaB ; 

 looking on it as perhaps an intermediate genus between Monophlebus and 

 Pophyrop)}iora. 



The characters of this genus are, therefore, antennse of eleven joints in 



the adult female, anal tubercles wanting or indistinguishable, an entire 



absence of mentum, rostrum, or buccal setse, but retention of an cesophagal 



opening. 



Ccelostoma zealandicum, sp. nov, (?) 



PI. VII., figs. 6-13. 



The adult female, figs. 6, 7, is brick-red in colour, reaching ^-inch in 



length, and rather more than J-inch in breadth at the widest part, which is 



toward the abdominal end. It is fat, corrugated, slug-like : there are eleven 



or twelve corrugations, those toward the head being the widest. It is sur- 



* Trans., Vol. XI., p. 203. 



