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Show 84 MR. F, E. BEDDARD ON THE CUCKOOS. [Feb. 17, of the scapula and coracoid the spinal tract seems to disappear altogether or is at most connected bv a few scattered feathers with the rest of the tract, which as in other species is double, the two halves uniting together opposite to the attachment of the femur ; from Fig. 7. Pterylosis of Centropus celebensis this point to the termination of the tract at the base of the oil-gland the feathering is stronger. It will be seen from the descriptions given above, that two distinct types in the arrangement of the feather-tracts are recognizable:- A. The pectoral tract of either side is single, narrowing gradually towards its termination as a single row of feathers a short way in front of the cloaca. B. The pectoral tract of either side divides into two branches opposite the articulation of the humerus, which enclose no space hut terminate separately, the inner branch further back than the outer. Group A includes the genera Cuculus, Cacomantis, Coccyzus, Piaya, and Saurothera, which differ from each other more or less in |