304 Mr. E. Doubleday on some new Diurnal Lepidoptera. 



Fig. 13. Systematic arrangement of the nervous system : a, cephalic gan- 

 glion ; h, ventral ganglion ; c, anterior branch of nerves or pha- 

 ryngeal commissure ; d, posterior branch ; e, anterior cephalic 

 nerves, with their ganglionic protuberances ; /, g^ posterior cepha- 

 lic nerves describing a loop ; A, optic nerves with their ganglions k. 



Fig. 1 4. The eye, optic nerve and its ganglion, magnified ninety-five dia- 

 meters : a, optic nerve ; 6, ganglion ; c, eye ; dy cornea or crystalline 

 lens, forming a rounded prominence; e, fibrils visible toward the 

 circumference of the eye ; /, excavation in the skin of the head, in 

 the interior of which the eye and the ganglion are inclosed. 



XXXII. — Descriptions of new or imperfectly described Diurnal 

 Lepidoptera. By Edward Doubleday, Esq., Assistant in the 

 Zoological Department of tlie British Museum, F.L.S. &c. 



[Continued from p. 236.] 



Fam. PAPILIONID^. 



Genus Papilio. 



The description of P. Evan given in the last Number had scarcely 

 passed through the press, when the Museum received a large and 

 valuable collection of insects from Sylhet, amongst which were 

 specimens of this species, up to that time unique in Mr. Harring- 

 ton's cabinet. One of these fortunately is a female, and I am 

 therefore able to point out the characters in which this sex differs 

 from the other. In size it is much larger, the expansion of the 

 wings being full an inch and a half greater ; the anterior wings 

 are less falcate, their colour above much paler ; the base is not 

 shaded with fuscous, the spot on the disco-cellular nervule is more 

 distinct, there are two or three irregular dark spots in the cell, 

 the dark border is narrower and not quite of so deep a colour, the 

 light fulvous spots are more distinct ; the posterior wings are 

 paler, the dark margin much narrower^ the inner row of spots 

 very distinct, the indentations and the tail pale fulvous, and the 

 under surface is much paler. 



In addition to some species described by Mr. Westwood not 

 previously in the cabinets of the Museum, this collection con- 

 tained a new species remarkable for the form of its posterior 

 wings, and connecting P. Protenor and Rhetenor with P. Ganesa, 

 Bianor and the other species of that group which have some of 

 the nervules covered with down towards the extremities. For 

 this species I propose the name of P. Elephenor, under which it 

 will be found described below. 



Whilst on the subject of the Indian Papiliones, I may remark 

 upon an error in regard to three Indian species into which Erich- 

 son, in his Report on Entomology for 1842, has fallen. I have 

 not troubled myself to do this so long as the report remained in 



