184 



MR. F. E. BEUOARD ON THE CUCKOOS. 



[Feb. 17, 



of the scapula and coracoid the spinal tract seems to disappear alto- 

 gether or is at most connected by 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. 



PterT!u;<is ol' Ccufroptis cekUnjiig. 



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 

 but terminate separately, the inner branch further back than the 

 outer. 



Group A includes the genera Cuculvs, Cacomantis, Coccyzus, 

 Piayn, and Savrol/tcra, which differ from each other more or less in 



