Corresp07/dence. 



439 



with the maxillary and premaxillary on either side (there may be excep- 

 tions to this, but it never happens in Pipilo) ; the postero-external angle 

 of either palatine is distinctly bifurcated; the palatine, on either side, de- 

 velops a secondary palatine process (^sp.p.. Fig. i), extending backwards 

 from a point to the outer side of where the anterior palatine limb fuses 

 with the premaxillary;* and finally, the interorbital septum is performed 

 entirely in bone, though the foramina for the exit of the first pair from 

 the cranium merge, and the vacuity is of some considerable size. 



Fig. I. Basal view of the s'ku.W oi II ah i a melatiocep/iala, adult i; , X 2, and mandible 

 removed. 



Fig. 2. Basal view of the skull of Piplo m. mej^alonyx, adult ,^ , X 2, and mandible 

 removed, /wx, premaxillary ; /, lacrymal ; w.v, maxillary; w/.v. /, maxillo-palatine ; 

 //, pterygoid; spp, secondary palatine process ; z/, vomer; //, palatine ; y. jugal ; j.?, 

 squamosal process ; </, quadrate ; 8, foramen for glossopharangeal and vagus nerves ; 

 <//, quadrato-jugal. 



*These processes are well shown in Figure i, and as I have never met with a former 

 description, I have designated them by the above-given name. Not having examined 

 the young of H. melanocephala, it is just possible that these interesting projections may 

 be developed on the part of the premaxillary, but the adult skull does not seem to so 

 indicate. The name I have bestowed upon them will answer very well in either 

 event. They are absent in such a form as Coccotkraustes vulgaris (See Huxley, P.Z. 

 S., 1867, p. 452, fig. 33), and very likely in our C, vespertina, though I have not ex- 

 amined the skeleton of that species. 



