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stouter than the other ; spiracular spines single, relatively large and 

 stout, margin with a widely separated row of small slender setae; 

 with 2-3 tiny quinquelocular disk pores between each spiracle and its 

 spine, no other pores noted ; anal plates triangular, with a long apical 

 seta, not reticulated; anal ring small, with pores, and, apparently, 

 six setae. 



Ootype.—C^t. No. 24770 U.S.N.M. 



A considerable number of species has been included in this genus, 

 and while it is not possible to comment accurately regarding the dis- 

 position of most of these, on account of the confusion existing in this 

 and related genera, it seems probable that most of the New Zealand 

 sepecies now included here are rather closely related to the type and 

 may be left in the genus for the present; C. eucalypti Maskell and 

 C. rhizophorae Maskell do not appear to be congeneric with the type, 

 but we can not indicate their proper location at present ; C. ceUulosa 

 Cockerell appears to be a C eroplastodes in the sense of Ceroplastodes 

 cajani (Maskell), which in turn is probably not congeneric with the 

 type of O eroplastodes. Beyond these, no suggestions can be offered 

 at this time as to the remainder of the species now included in the 

 genus. 



The following generic diagnosis has been prepared chiefly from the 

 description of the type species, with reference to some of the other 

 included species. 



GENEKIC DIAGNOSIS OF CTENOCHITON. 



Coccine forms (of Fernald Catalogue) ; adult female more or less 

 convex, usually x^ry slightly so, covered in life with glassy, whitish, 

 or transparent wax plates, these often fragile and broken or wanting, 

 projecting beyond the body margin like saw teeth when perfect; 

 antennae G-8-segmented, the third usually long; legs and spiracles 

 normal, the claw digitules somewhat swollen, claw with or without 

 denticle, mentum 1-segmented, marginal setae small, conical spines 

 set variably from very close together to some distance apart, accord- 

 ing to the species, spiracular spines single, large, strongly differen- 

 tiated, dorsal .setae wanting or very small, dorsal spines present in 

 a definite pattern in some species, ventral setae few. not conspicuous, 

 derm with tiny tubular ducts and, ventrally, with two sizes of multi- 

 locular disk pores, with or without other types of pores, anal cleft 

 short, plates small, tapering behind, with apical and subapical setae 

 and a large dorsal pore (or hair base) , with ventral ridge setae, with- 

 out fringe setae, without hypopygial setae, anal ring placed anterior 

 to plates, with six setae and double row of pores; larva ovate, anten- 

 nae 6-segmented, legs normal, spiracular spines occurring singly, 

 marginal setae small, slender, spiracular disk pores present, anal 



