440 Prof. R. Collett on a 



d". Interscapulio dorsoque cbalybeo-viridibus : uro- 

 pygio et supracaudalibus purpurascentibus vix 

 cbalybeo aut cbalybeo-viridi nitentibus: ab- 

 domine purpureo, bypocbondriis seneo-purpu- 



reis purpurascena. 



e". Tergo rubescenti-purpureo : uropygio dorso con- 

 colore, vix chalybeo, sed miuime viridi lavato. 

 c'". Tergo vix chalybeo-purpureo lavato : abdomine 

 sordide rubescenti-purpureo aut seneo-pur- 



pureo porphyronotus. 



d'". Tergo rubescenti-purpureo, unicolore. 



e*. Corporis lateribus ceneo-viridibua : abdo- 

 mine cuprescenti-viridi minor. 



d*. Corporis lateribus chalybeis vel cbalybeo- 

 viridibus vulgaris, festiv, 



b. Pileo dorsoque concoloribus unicolor. 



XL VI. — On a Breeding -colony of Larus eburneus on Spits- 

 bergen. By Professor Robbrt Collett, Zoological Mu- 

 seum, Christiania. 



(Plate XIII.) 



In August 1887 Capt. Johannesen, master of one of the 

 Norwegian Arctic traders, passed Cape Smith, the eastern- 

 most point of north-eastern Spitsbergen, and one which has 

 only been reached in summers exceptionally free from ice. 

 On the small island of Stor-oen, lying about 16 English miles 

 to the east of Cape Smith, in 80° 9' N. lat., he discovered 

 -|._ a colony of Larus ebumeus, and as it was easily accessible, 

 and he had not previously succeeded in examining one, 

 although he had seen several in Tsfjorden and in other parts 

 I of Spitsbergen, he made a short stay at the island in order, 

 if possible, to obtain eggs and young, which he knew would 

 of interest. 



On the 8th of August, when he visited the island, he found 

 young birds in all stages, from newly hatched to fully fledged, 

 together with a small number of eggs, Avliich, however, were 

 on the point of hatching, and in all probability not one 

 would have been left a week later. Captain Johannesen 

 brought with him to Tromso 19 eggs and one nest, together 



