XESTINfi-SKKlLs or mUTISH BIliD- 



183 



cast mast of Scotland and some colonics may bo tound on the islets m 

 loHis. It ftcuerally nests in company Avith others of its kind and often 

 anion- colonies of the Lesser IJlaek-backed and Common Gulls. Like 

 other large (iuUs it is a great robber of eggs and young l)irds. Three 

 is the full nnniljcr of eggs laid. 



Xaiiiisliire, (itli .liinc. 

 Pn-sciitnl hii ir. R. Oi/ilnr-Clnnit .V //. N. /(",.„/, /'Jxy/'.v. 



No. 125. GLAUCOUS GULL. (Larus -lauciis.) 



.Mthougli this circumpolar iiird is an irregular winter visitor to our 

 sliores, it has never been known to breed in the British Islands, its 

 nesting-places being in the Arctic Ocean on the shores of both 

 continents. Its iiabits, food, and mode of nesting arc similar to those 

 of the Greater Black-backed Gull. The stonc-eolourcd eggs, spotted 

 with ash-grey and Ijrown, arc laid during the first half of June and are 

 usually three in number. 



AVaigats Island, July. 

 Pn-xriitril liij H. .1 . I'i'iirsiiii, Esfj. 



No. 126. SANDWICH TERN. (Sterna cantiaca.) 



A regular visitor to the British Islands, arriving in March and April, 

 and returning south early in autumn. It nests in colonies, associating 

 with Arctic or Common Terns, and not infrequently changes its 

 breeding-grounds when persecuted. The nest is generally a sliallow 

 hole scratched in the shingle or in the sand among sea-campion, sorrel, 

 and other plants, but sometimes a tolerably solid structure of bents may 

 be seen. The eggs are usually two and rarely three in number, and 

 vary much in colour and markings. 



Scotland, lOth June. 

 Presented hi/ Captain S. G. Reid ^- IV. R. Oyihie- Grant, Esq. 



No. 127. ROSEATE TERN. (Sterna dougalli.) 



This southern species visits the British Islands regularly in small 

 numbers, arriving at the end of April and leaving as soon as" the young 

 are able to fly. It is generally met with in small colonies of one or 

 two pairs associating with Arctic or Common Terns. The eo-o-s, two or 



