62 Zoological Society. 



Total length, 5| inches ; bill, | ; wing, 3^ ; tail, 2| ; tarsi, f . 



Young male. — Similar in colour to the female, but with the throat 

 whiter and the markings on the chest much more distinct, and ex- 

 tending over the abdomen also. 



Nearly allied to Pachycephala pectoralis, but differs in being rather 

 smaller, and in having no black round the eyes or on the ear- coverts. 



Hab. Port Essington. 



Pachycephala melanura. Pack, capite, lunuld pone oculos, per 

 latera colli ductd et pectus transeunte, cauddque nigris ; guld albd, 

 torque nuchali, corporeque subtus, saturate fiavis. 



Head, crescent commencing behind the eye and crossing the chest, 

 and the tail black ; throat pure white ; collar round the back and 

 sides of the neck, and all the under surface very rich gamboge-yellow ; 

 upper surface rich yellowish olive ; wings black ; the coverts mar- 

 gined with yellowish olive ; the primaries narrowly and the secon- 

 daries broadly margined with yellowish grey ; bill and feet black ; 

 irides brown. 



Total length, 6 inches ; bill, | ; wing, 3^ ; tail, 2^ ; tarsi, |. 



Hab. North coast of Australia. 



Pachycephala simplex. Pack, corpore superior ef us co, inferiore 



fuscescenti-albo, singulis plumis strigd fused fere obsoletd longi- 



tudinaliter notatis. 



All the upper surface brown ; all the under surface brownish 



white, with a very faint stripe of brown down the centre of each 



feather ; irides light brown ; bill and feet black. 



Total length, 5 inches ; bill, J ; wing, 2 J ; tail, 2| ; tarsi, ^ . 

 Hab. Port Essington. 



Mr. Gould then mentioned, that having obtained another species 

 of the same form as the Acanthiza pyrrhopygia of Messrs. Vigors and 

 Horsfield, which latter differs considerably from the other members 

 of that group, he proposed to form the two birds into a new genus, 

 under the name of Hylacola, with the following characters : — 



Genus Hylacola. 



Gen. Char. — Rostrum capite brevius, compressum, ad basin aequ^ 

 altum atque latum ; culmen gradatim ad apicem mandibulse supe- 

 rioris declive ; apex leviter emarginatus ; rictus vibrissis raris in- 

 structus. Nares basales, oblongae, magis grandes, et operculo 

 tectse. Al(B breves, admodiim rotundatse concavse ; primarise prima, 

 secunda et tertia, longitudine dissimili, quarta, quinta, et sexta 

 cosequales, et longissimae. Cauda magis elongata, et rotundata. 

 Tarsi mediocres. Digiti magis elongati ; externi cosequales. 



Typus, Acanthiza pyrrhopygia, Vig. and Horsf. 



Hylacola cauta. Hyl. lined albd per faciem super oculos ductd 

 vertice, corporeque superiore fuscis ; caudae tectricibus crissoque 

 pallide castaneis ; alarum tectricibus fuscis, fuscescenti-albo mar- 

 ginatis, primariis fuscis, pogoniis externis ad basin conspicut 

 albis. 



At the base of the upper mandible a line of white, which con- 



