ris margine vix indcntato ; naribus basalibus et vix tectis ; 

 tarsis brevioribus, unguibus majoribus et plus curvatis. 



Cactoknis scandens. (Spec, typ.) Cact. intensifuliginosa, crisso 

 albo ; rostro et pedibus nigrescenti-brunneis. 



Long. tot. 5 unc. ; rostri, f ; ala, 2^; caudce, If; tarsi, ^. 



Foem., vel Mas jun. Corpore superiore, gutture pectoreque in- 

 tense brunneis, singulis plumis palUdiore marginatis ; ubdomine 

 crissoque cinereis, stramineo tinctis ; rostro pallide fusco ; pedi- 

 bus nigrescenti-fuscis. 



Cactornis assimilis. (Mas jun. ?) Cact. corpore suprvL fuligi- 

 noso, nee 7ion gutture abdomineque, illoriini plumis, cinereo mar- 

 ginatis ; rostro pallid^ rufescenti-brunneo ; pedibus nigrescenti- 

 brunneis. 



Long. tot. 5^ unc; rostri, |; alee, 2f ; cauda, 1|; tarsi, |. 



Certhidea (subgenus). 



Certhidea differt a genere Geospizd rostro graciliore et acutiore ; 

 naribus basalibus et non tectis ; mandibulce superioris margine 

 recto ; tarsis longioribus et gracilioribus. 

 Certhidea olivacea. Cert, summo capite, corpore superiore, aUs 

 cauddque olivaceo-brunneis ; gutture et corpore infra cinereis ; 

 rostro pedibusque pallide brunneis. 

 Long. tot. 4 unc. ; rostri, ^ ; alee, 2 ; cauda: l^ ; ta7-si, f . 

 Of the groups here characterized, Geospiza, Camarhynchus, and 

 Cactornis, belong to one type ; but with regard to Certhidea, Mr. Gould 

 remarked that although lie confidently believed that it should also be 

 referred to the same group with the three former, yet in its slighter 

 form and wealier bill it has so much the appearance of a member of 

 the Sylviadce, that he would by no means insist upon the above view 

 being adopted until the matter shall have been more fully investigated. 

 Mr. Gould deferred entering into any further details respecting 

 the species under consideration until Mr. Darwin had furnished him 

 with some information relating to their habits and manners. 



Mr. Gould then resumed the exhibition of a portion of his own 

 collection of Birds from Australia, and characterized the following 

 new species : 



Hemipodius melanogaster. 



Hem. capite, auriculis, guld abdomineque nigris ; lined super oculum 

 oriente et ad nucham excurrente, plumis singulis maculd ad apicem 

 albd ; nuck(B plumis nigris et castaiieis, maculis pluribus albis ; 

 dorso superiore castaneo-fusco, plumis singulis maculd albd, li?ieis 

 duabus nigris cum fascid unicd nigrd apicali ; scapulis, tectricibus 

 primariis secundariisque rufo-brunneis, plumis singulis maculd 

 albd nigra circumdatd ; remigibus primariis satwati brunneis ; 

 femoribiis et tectricibus superioribus et inferioribus caudte brun- 

 neis nigro fasciatis et irroratis ; rostro pallide brunneo ; pedibus 

 carneis. 



