GREY NODDY. 
especially, grey inner wing-coverts, much darker than those of the preceding, 
which are quite light tending to white. I propose to distinguish these as 
Procelsterna cerulea nebouxi, subsp. n. 
Quite an unexpected form recurs at St. Ambrose group not far from South 
America. This form was called P. cinerea by Saunders and more closely 
resembles that than any other race. It is only separable by its superior size 
— an average male measuring : culmen (exp.) 30.5 mm., wing 215, tarsus 28, 
middle toe 31. I propose to name this subspecies 
Procelsterna cerulea imitatrix, subsp. n. 
My nomenclature for this species would therefore read : — 
Procelsterna cerulea cerulea (Bennett) ; Christmas Island ; Hawaiian group. 
As synonyms should be noted S. cinerea Neboux, A. te'phrodes Reichb., 
A. parvulus Gould, and for the present P. saxatilis Fisher. 
Procelsterna cerulea teretirostris (Lafresnaye) ; 
Paumotu, Marquesas and Society groups. 
Synonyms are P. tereticollis Lafresnaye and M. plumheus Peale. 
Procelsterna cerulea nehouxi Mathews ; Ellice and Phoenix groups, Samoa. 
The type comes from the EUice group. 
Procelsterna cerulea cinerea (Gould) ; North-east Australia, Norfolk and 
Lord Howe Islands, Kermadec and Friendly Islands. 
As synonym is P. albivitta Bonaparte. 
Procelsterna cerulea hnitatrix Mathews ; 
St. Ambrose Islands, off coast of South America. 
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