JASONIADES. 285 



crossed by a row of yellow spots on the fore-wings, and yellow 

 lunules on the hind-wings, the black space within the latter 

 dusted with blue. Four black bands run from the costa 

 of the fore-wings, the two outermost short, the basal one and 

 the next long, uniting above the black border of the hind- 

 wings ; between this and the border is an orange mark on the 

 inner-margin. The hind-wings are strongly dentated, and the 

 tail is rather long and slender. This typical form is often called 

 Papilio t urmis, Linn. The true E.gtaucus is a large dimorphic 

 and melanic form of the female, most frequently found along 

 with the type in the Southern United States. The larva, which 

 feeds on Prunus t has the thoracic segments much thickened. 

 It is green above, and whitish below, with seven oblique 

 greenish stripes on the sides, and an interrupted red lateral 

 line. Between the fourth and fifth segments is a transverse 

 band, yellow before, and black behind ; on the third segment 

 is a lateral yellow eye-spot, pupilled with blue. The head is 

 flesh-colour, with a yellow collar. The pupa is varied with 

 brown. 



[LI. A.] Jasoniades, Hiibner. The type of this genus is 

 f. xuthus (Linn.), a Butterfly found in Siberia and Northern 

 Asia generally, which has been erroneously reputed European. 

 It measures three or four inches across the wings, and re- 

 sembles a large pale Achivus machaon, but all the nervures 

 are broadly black, leaving only long or triangular cream- 

 coloured spots between, and there is a row of sub-marginal 

 lunules of the same colour. There is a small orange eye-spot 

 at the anal angle of the hind-wings, yellow beneath, and en- 

 closing a black pupil. The spring brood is smaller and paler. 

 The larva, which feeds on Umbellifcra^ is green, with broken 

 black transverse bands, ending in hooks or spots below. The 

 retractile fork is yellow. 



