( -20 ) 



species, bnt differ from the uew species in the harpe being practically like that 

 of ni(jriconus. Moreover, in some of the characters — for instance, the development 

 of the black postdiscal band of the uppersidc of the hiudwing, and the black line 

 along the abdominal edge on the underside of this wing — the specimens incline 

 decidedly towards nigricornis. The teeth of the hindwing are, however, on the 

 whole rather more acute than in either nigricornis or the new species. In one of 

 these individuals, from !Minas Gcraes, February, the antennae are tawny, not black ; 

 a second specimen from Minas Geraes, August, has unfortunately only a remnant 

 of one antenna, which is black. What are these specimens ? Their characters 

 are such that the individuals may be hjbrids between the new species and 

 nigricornis. Besides tlie two Minas Geraes specimens we have one from Castro, 

 Parana, September, and two labelled simply " Brazil," all males. Is it likely tliat 

 we should have received five hybrids, while we got only sis specimens of one of 

 the supposed parent species ? Moreover, the tawny antenna of one of the Minas 

 Geraes specimens could hardly be explained by assuming the specimen to be the 

 product of two parent-species which have both black antennae. It would be 

 necessary to assume further that in this individual there was also the blood of 

 P. telesilaus, which has a tawny antenna. We are inclined to believe that the 

 specimens belong to a third species ; they may even be the Atlantic representatives 

 of the insect figured PI. VI. fig. 29, tliough they resemble in colour much more 

 PI. VI. fig. 30. We purposely abstain from giving a name to these individuals, 

 believing it to be much wiser to wait till a larger material has been examined. 

 One necessary desideratum is also the knowledge of the extent of variation of 

 P. protesilaus tugricor/tis during the dry and wet seasons. After our discovery 

 of a slight but distinct difference in the genitalia of the seasonal forms of Papilio 

 xuthus,* it would not be very astonishing if some such variability should be proved 

 by breeding to obtain also in P. protesilaus. The difference in the density of the 

 scaling of the forewing is a character known to vary with the season in P. podalirius 

 and allies. 



152. Papilio helios spec. nov. (PL VI. fig. 30). 



(? ? . Antenna and frons black as in P. protesilatis nigricornis. Wings more 

 or less pervaded with yellow. Forewing transparent, the scaling of the upperside 

 dense only from hindmargin to M-, but even in this area the scales somewhat 

 reduced in size, not covering one another as in P. protesilaus, either rounded at 

 apex, entire, or obtusely bidentate ; wliite scaling between M- and costal margin 

 more or less completely fallen oif, the scales narrow, those in the distal intersjiaces 

 between the black bands rather broader than in P. protesilaus ; first band stojiping 

 short at SM^, there being only a very few black scales behind this vein ; second 

 band mostly reaching beyond SM", but not attaining hindmargin, interspace between 

 these bands wider than that between second and third band ; fourth band short 

 or vestigial ; fifth band not narrowing to a point at lower angle of cell, postdiscal 

 band closely approaching lower angle of cell, posteriorly almost separated from 

 tbe marginal band, the white interspace M-— (SM') being obscurely continued to 



SM-. Hindwing more sharply dentate than in P. protesilaus nigricorni.'<. 



especially at C, SC^ and W ; black postdiscal band with more or less straiglit 

 jiroximal edge, the partitions E- — M' of this band not separate from one another, 

 larger and proximally more sharjily defined than in P. protesilaus, red anal spot 



ZeitscJir. ]Viss. Zool. Ixsxiii. p. 17'J (1905). 



