TJie u Life-history of Drepana arcuata " &c. 147 



No. 2 (c?), ad., Mazoro, north of the mouth of the Zam- 

 besi (Earl Russell). — Feathers of the middle of the breast and 

 belly quite black; shaft-streaks ou the back much fainter 

 than in .No. 1 ; feathers behind the gape white and, passing 

 down the sides of the neck, entirely surround the naked 

 throat ; sides of the neck black ; long spurs with a rudi- 

 mentary second pair on each tarsus. Wing 7*4, tarsus 2*4. 



No. 3 ( $ ), immature, Dar-es-Salaam (Sir John Kirk). — 

 Most of the feathers on the centre of the breast and belly- 

 white, with wide black margins and black shafts ; on the 

 back like No. 1, but more black cross bars and spots; feathers 

 from the gape white with black shafts, and on the sides of the 

 neck black with white edges ; no spurs. Wing 6*4, tarsus 

 2-1. 



No. 4, 2 ad., River Tana, Sept. 1838 (H.C. V. Hunter, 

 Esq.). — Breast and back like No. 1 ; feathers behind gape 

 white, and, passing down the sides of the neck, surround the 

 bare throat ; sides of the neck black with white edges ; no 

 spurs. Wing 7'1, tarsus 21. 



No. 1 and No. 2 come from near the locality (Tette) whence 

 the type of P. Humboldti was originally described ; No. 3 

 almost exactly answers the description of that type ; while 

 No. 4 comes from the same locality (Osi River) whence P. 

 leucoparceus was obtained, and both in plumage and sex corre- 

 sponds exactly with Fischer and Reichenow's description. 

 As there is not the slightest doubt that these four specimens 

 represent only one species, it is evident that P. leucoparosus is 

 synonymous with P. Humboldti. 



XVII. — A few Remarks on Prof. Packard's Papers entitled 

 u Life-History of Drepana arcuata" and " Hints on the 

 Evolution of the Bristles, Sjnnes, and Tubercles of certain 

 Caterpillars " (Proc. Boston Soc. Nat. Hist. vol. xxiv. 

 pp. 482-559). By A. G. Butler, F.L.S., F.Z.S., &c. 



The above-mentioned very suggestive papers, for a copy of 

 which 1 am indebted to their indefatigable author, constitute 

 one continuous article, containing much valuable information 

 diligently brought into a small compass. 



