5IO 



SNODGRASS AND HELLER 



toe.^ In M. hawaiiensis the pale slaty plumbeous color of the back 

 of the head and neck reaches so far ventrally on the sides of the head 

 and neck, and even on the upper part of the breast, that there is dis- 

 tinctly marked off on the chin and throat a median longitudinal area 

 of dark plumbeous-brown well defined on each side against the paler 

 lateral parts. 



We are indebted to Mr. R. C. McGregor for the loan of an imma- 

 ture male of Micranous haivaiiensis^ and to Mr. William Alanson 

 Bryan for an adult male of the same species from the Bernice Panahi 

 Bishop Museum of Honolulu. 



The collection contains lo specimens in all, there being i adult 

 male, 4 adult females and 2 immature females, taken on Cocos Island 

 in July ; and 3 immature specimens, i male and 2 female, taken on 

 Clipperton Island in November. Their measurements follow : 



MEASUREMENTS, IN MILLIMETERS, OF Micranous diamcsus. 



Adult i 

 Imm. 9 



Micranous ha-waiiensis. 



382 



225 

 210 



125 

 118 



38.5 

 38 



7-5 



28 

 25 



28 

 25 



21.5 

 20 



24 

 24 



Hawaiian 

 Islands. 



This species was rather abundant in July on Cocos Island, where it 

 was nesting with Gygis Candida in the tops of tall trees a short dis- 

 tance inland at Chatham Bay. On Clipperton Island we found only 

 immature birds in November. They were associated with Anous 

 stolidus ridgwayi. 



iThe statement in The Condor, tii, No. 3, May, 1901, p. 76, that Micranous 

 diamesus differs from Micranous haivaiiensis'' in having a more slender and 

 shorter bill and shorter tarsus " is a mistake and should read as given above. 



