Recently published Ornithological Works. 123 



collection, of which we have already spoken (Ibis, 1892, 

 p. 165). It is especially valuable for the excellent series of 

 many little-known species obtained during every month of 

 the year, and therefore affording opportunities for observa- 

 tion of variations in plumage, of which Mr. Allen has not 

 failed to avail himself. Of the rare Piprine form, Hetero- 

 pelma Jiavicajjillum, for instance, a series of 65 specimens, 

 representing both sexes and the plumage of every month in 

 the year, is included ; of Casiornis rubra 23 specimens, which 

 show, in the latter case, no '' very appreciable " amount of 

 sexual variation. Of the little-known Formicarian Herpsi- 

 lochmus longirostris, a series of 47 specimens enables several 

 important deductions to be arrived at. The Motmots of the 

 group of Momotus momota also give occasion for critical 

 remarks, but " Mr. Sclater " was not the cataloguer of the 

 Motmots in the 17th volume of the British Museum Cata- 

 logue, nor can he quite believe that the Chapada specimens 

 are correctly referable to M. subrufescens. 



Pygmornis chapadensis is described as a new species in 

 part iii., and, as new subspecies, Piaya cayana cabanisi 

 and Buteo albicaiidatus sennetti. Altogether 324 species are 

 registered as represented in the Chapada Collection, by the 

 working out of which a material advance has been effected 

 in our knowledge of the South-Brazilian Oruis. 



2. Blaauw's Comparative List of the Birds of Holland and 

 Engla7id. 



[Comparative List of the Birds of Holland and England. By F. E. 

 Blaauw. Notes Leyden Mus. xv. p. 183.] 



Our best thanks are due to Mr. Blaauw for his comparative 

 list of the birds of Holland and England, w^hicli will be very 

 useful to students of our native avifauna. It will be the 

 more easily consulted by British ornithologists because the 

 nomenclature and arrangement of the List of the B. O. U. 

 are followed throughout. Thus the list of British Birds, 

 having been increased by 10 additions since 1883, now 

 consists of 385 species. Short notes are added to the names 

 of such of them as occur in Holland, to indicate when and 

 where they are found. Altogether 315 species have been 



