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of the cell ; in P. Dohertyi however only a very small discal 

 orange-yellow spot or two is present ; but generally the 

 wing is entirely immaculate ; in P. Hippolytus the disc of 

 the wing is one-half golden-yellow, and one-half a dusted 

 grey, with a grey spot within the cell ; the rest of the 

 wing is always black, brown-black, or reddish dark brown — ■ 

 the marginal band being often very broad — and lunated 

 within ; veins always very conspicuous in the yellow. 



Head of moderate size ; eyes very prominent, palpi 

 invisible ; antennae as in the $ . 



Thorax moderately robust ; pronotal collar red or 

 yellow — more or less prominent, the red sometimes either 



absent or concealed by the pilose covering of the pro- 

 thorax ; the meso- and meta-thorax always velvety-pilose 

 black or brown ; sides of the thorax with pectoral red 

 spots or marks more or less extensive in area ; abdomen 

 long and slender, generally the same length as the an- 

 tenna?, and brown and yellow, brown and grey, or, — in the 

 case of P. Hippolytus, quite grey, with lateral black dots 

 and ventral dark marks ; anil tuft generally very dark — 

 in P. Hippolytus it is orange ; the abdomen in P. 

 Honrathiana is entirely brown-black. 



Legs as in the $ , or differing very little. 



Type of the genus Ornithoptera Helena, Linnaeus. 



Among the numerous forms included in this genus, P. Hippolytus differs so greatly from all the other species in its pattern and style of colour, 

 whether as regards the wings or body of either sex, as to leave no doubt that it merits a position quite unique among its congeners. Many of 

 the so-called species may be accepted with a doubt ; but Hippolytus is certainly a more independent and satisfactory species than even P. Vandepolli 

 or P. Miranda, though so much may be said in their favour. 



