212 PROCEEDINGS OF THE ACADEMY OF [April, 



ish; blackish shaft markings of the shorter under tail-coverts larger; 

 feathers of the rump with somewhat broader white edgings. 



Wing, 122 mm. 



Type locality. — Christmas Island, Indian Ocean, south of western 

 Java. 



Geographical distribution. — Christmas Island, Indian Ocean. 



This little known form we have not seen ; but it is apparently recog- 

 nizable, though very much like Collocalia neglecta, of which it is possibly 

 but a subspecies. 



