R.Clapp Nov. 19 Aranuka Atoll, Gilbert Islands, Pacific O. Thalasseus bergii : In two individuals examined of three collected, neither had a brood patch. These two birds were males and had testes 5x4 and 5x3 mm. respectively. The unexamined bird, a female, had a relatively small ovary (10 mm) with the largest ovum 2 mm. (No recent breeding ?) Anous stolidus Number Sex Brood Patch Gonads Primaries Rectrices 30400 F Yes- 14mm3mm Not in molt R3 in sheath 30401 F No 10mm 1-2-RN R2 in sheath 30402 F Yes 1.0.4mm 10 dropped? Not in molt 30404 F Yes 1.0.3mm R.Pl6 in sh. Not in molt L all present 30403 ? Yes ------- 1&10 in sh. (11) R2 Dr. 10 younger R4 Sh. 30406 M Yes 10 mm. Not in molt Not in molt 30405 M No 4 mm. 1-4*5S*6-9N* R5, L6 10S R5 older Summary : Brood patches were found in both sexes of the Common Noddy and 5 out of 7 birds had brood patches. In both males and females, gonads were larger in birds possessing brood patches than in those which did not. Of 8 birds 6 were molting in the primaries and 5 were molting in the rectrices. All those individuals which did not exhibit molt were those which possessed brood patches. Anous minutus Number Sex Brood Patch Gonads Primaries Rectrices 30407 F No 12 mm. 1S, RN R5,L6 (5,01d) Gygis alba Number Sex Gonads Brood Patch 30408 Yes 30409 No 30410 Yes