Mr. E. Doublcday on some new Diurnal Lcpidoptera. 371 



by the feathers, as in the Velvet Scoter*." The highly arched 

 form of the bill above the nostrils requires however especial no- 

 tice f. In the absence of a figure, some idea may perhaps be 

 given by the following two notes of its depth : — 



in. lin. 

 Depth of bill at base of ridge where plumage terminates — "i ~ . Q 



16 lines from tip / * 



Depth of bill at 10 lines from tip 3 



Length of bill above (not following curve) 1 4 



Length of bill to rictus 2 6 



Length of bill to base of lateral protuberances 2 4 



Breadth of bill between the lateral protuberances 1 4 



The specimen which has furnished the subject of this commu- 

 nication was in course of being preserved for Dr. Charles Cupples 

 of Lisburn, who on being informed of its rarity most liberally pre- 

 sented it to the Belfast Museum. 



The Surf Scoter is known only as a British species from its 

 having been obtained at the Orkney and Shetland Islands, with 

 the exception of one individual, recorded by Mr. Gould as ob- 

 tained in the Firth of Forth, and " a recently shot one sent to 

 Mr. Bartlett for preservation," as noticed in YarrelPs work, 

 vol. iii. p. 322, 2nd edit., but the locality where it was killed is 

 not mentioned — the "Naturalist, vol. iii. p. 420," is referred to for 

 the original notice of this specimen. 



Wilson (briefly) and Audubon (very fully) give interesting de- 

 scriptions of the habits, &c. of this species, which is common on 

 the North American coast, increasing in numbers northward. 



XLI. — Descriptions of new or imperfectly described Diurnal 

 Lepidoptera. By Edward Doubled ay, Esq., Assistant in 

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



[Continued from vol. xvii. p. 26.] 

 Fam. PAPILIONID^E. 

 Genus Papilio. 

 Pap. Anticrates. Pap. alis anticis trigonis, posticis caudatis, omnibus 

 albis, marginibus externis nigris, anticarum linea transversa, inter- 

 rupta alba, posticarum lunulis sex albis notatis, anticis fasciis 

 quinque, posticis duabus nigris. Exp. alar. 3 unc. vel 75 mill. 

 Hah. Silhet. 



Above, wings white, with a broad black border along the outer 



* Illust. Brit. Orn. vol. ii. p. 335. 



f Yarrell's figure of this species is admirable, with the single exception of 

 the peculiar form of the bill not being represented. The arched profile of 

 the upper mandible in the specimen under consideration (probably from its 

 being a very old male) is still more strongly marked than in Mr. Selby's 

 figure, representing a male bird of life size. 



