268 MESSRS. SCLATER AND SALVIN ON THE [Feb. 15, 



coloration he gives is that of H. bitceniata, Cox, also from South 

 Australia, and persists in regarding the normal state of H. anga- 

 siana as " solid, white, and porcellaneous," and furthermore gives 

 " H. angasiana, not Pfeiffer," as synonym of H. bitceniata, Cox, in 

 his ' Monograph.' The coloration of H. angasiana, when fresh, is 

 singularly like that of //. bitceniata, although the form and charac- 

 ters of the two species are extremely different. I have therefore 

 given a figure of both the species on the accompanying plate, which 

 ought to set the matter definitively at rest. I may add that //. bitce- 

 niata, Cox (1868), is a synonym of H.flindersi, A. Ad. & Aug., 

 (P. Z. S. 1863), the description of which was unfortunately also 

 taken from a bleached specimen from which the bands had disap- 

 peared. 



The shell described and figured as H. angasiana by Dr. Newcomb 

 in the 'Annals of the Lyceum of Natural History of New York,' in 

 May 1860, must stand as H. bougainvillei, it having been described 

 and figured under the latter name by Dr. Pfeiffer in the ' Proceed- 

 ings ' of this Society in February 1860 (see P. Z. S. 1860, p. 133). 



EXPLANATION OF PLATE XX. 



Figs. 1-5. Helix beatrix. Figs. 10, 11, 12 Helix rhoda. 



Figs. 6, 7. Helix ramsdeni. Figs. 13, 14. Helix angasiana. 



Figs. 8, 9. Helix moresbyi. Figs. 15, 16. Helix bitceniafa. 



3. Notes on some of the Blue Crows of America. By P. L. 

 Sclater, M.A., Ph.D., F. R.S.j and Osbert Salvin, 

 M.A., F.R.S. 



[Received January 9, 1875.] 



The typical Crows (Corvus) are, as is well known to naturalists, 

 in the New World essentially a northern form, and have only pene- 

 trated into the Neotropical Region as far south as the highlands of 

 Guatemala and the northern Antilles. Several genera of Blue Crows 

 take their place in Central and Southern America. Of these, in our 

 ' Nomenclator,' we enumerated 32 species as autoptically known to 

 us. But during the past three years the receipt of additional speci- 

 mens and examination of others in different collections has enabled 

 us to add slightly to the number, and to make certain rectifications 

 in our own list. These we beg leave to submit to the Society. 



1. Cyanocitta* argentigula. 



C. argentigula, Lawr. Ann. Lye. N. Y. xi. p. 88 (1875). 



Under this name Mr. Lawrence has recently described a Jay from 

 Costa Rica with which we are not yet autoptically acquainted. It is 

 apparently a well-defined species, belonging to the group containing 



* The type of the genus Cyanocitta of Strickland is Garrulus cristat/is, Linn., 

 as stated in precise terms by the founder of the genus (Ann. Nat. Hist, xv. p. 261 , 

 1845); and we therefore cannot understand why the authors of 'North American 

 Birds' and other American writers porsist in giving the type as Garrulux 



