502 SOME NOTES ON SINDH BIRDS. 



many species are practically confined to parts of Rajpootana 

 and the Punjaub, Sindh and Cutch. 



This little map is not nearly sufficiently in detail to admit of 

 the subject being" worked out as it should be. Our materials 

 are not yet nearly sufficiently full and accurate to permit of 

 the accurate delineation of Iso-ombric zones ; all that has here 

 been attempted is to convey a general conception ; we should 

 require seven or eight instead of four such zones in order to 

 make the correspondence thoroughly clear ; but still this little 

 map will, I think, suffice to prove the general correctness of 

 the view which I put forward ; and so far as I know for the first 

 time, viz., that in this Empire, the average rainfall is the most 

 potential factor in determining the distribution of species where 

 birds are concerned. 



How far this tentative axiom will be found applicable to other 

 tropical and sub-tropical countries, or how far again what is 

 true of birds may prove true of mammals, reptiles and other 

 sections of the animal kingdom, I cannot pretend to say ; 

 but the subject is of sufficient importance to demand the con- 

 sideration of all those interested in the laws that govern the 

 distribution of animal life. 



In conclusion, it may be well to notice that Mandalay and 

 all Upper Burmah are left blank, not because we believe them to 

 belong to the arid zone, but because no materials exist for 

 coloring these correctly. 



A. O. H. 



jlomc IJotes m §'u\l\ firfts. 



By S. Doig, C.E. 



I HAVE recently come across one or two species not hitherto 

 enumerated in any of the former lists* of Sindh Birds, and 

 I may as well put these on record at once. 



I have also one or two remarks to make in regard to species 

 which are not new to the Sindh list. 



* Vide I., 148 ; V., 328; VII., 113 and 173, 



