Ii57 



not only the Octodontidee, but the whole of the great section Hystri- 

 cina, established by himself chiefly upon characters fumished by the 

 crania, possess peculiarities which will serve to distinguish them 

 from other groups of Rodents. In this great section, moreover, we 

 find the tibia and fibula invariably distinct, and not echylosed, as in 

 the MuridcB, which should, I now think, embrace the Myoxid(e, but 

 not the genus Anomalurus, which Prof. Wagner is inclined to ])lace 

 in the last-rnentioned section, that genus having the tibia and fibula 

 distinct, as in the Sciurine and Hystricine groups. 



Mr. Fraser brought before the Meeting the following species of 

 Chilian Birds, not included in the former collection. (See Proceed- 

 ings of Zoological Society, 1843, p. 108.) 



Milvago megalopterus, Meyen ; Synallaxisflavogularis, Gould ; Stur- 

 nella militaris, Vieill.; Attagis Gayi, Less. ; Aphriza Torvnsendii., Aud. ; 

 Calidris arenaria, 111. ; Cyampterus fretensis, Eyton ; Dafila pyrogas- 

 ter, Eyton; Dafila urophasiams, Eyton; Phalacrocorax albigula, 

 Brandt. 



To the last-mentioned bird the following note was attached : — 

 " Guanayre of the natives. A very scarce bird ; found along the 

 shores of Chile in rocky places. T. B." 



Mr. Fraser also described a new bird from Chile, for which he pro- 

 posed the name of Leptopus Mitchellii*. 



Leptopus. 



Rostrum longum, tenue, rectum ; nares basales ; alae mediocres ; pri- 



mariae tres ferė seąuales, secunda longissima ; cauda subrotundata ; 



tarsi mediocres; digiti longi et tenues ; nulius digitus posterior; 



ptilosis junioris seniori dissimilis. 



The bill of this bird is of the šame formation as that of Totanus 

 chloropygius, Vieill., vvhile the feet resemble those of Htaticula tri- 

 collaris. 



Leptopus Mitchellii. Lep. capite fuscescente lined albd circa 

 verticem ; colio ferrugineo ; cotpore superrie cinereo-fusco purpu- 

 reis metallicis coloribus ornato ; fascid albd apud pectus ; subtits 

 fasctis parvis alhis et nigris alternis ; rostro saturate viridi ; tarsis 

 flavis. 

 Tot. long. 7 ; alae, 4Į ; cauda, 2^ ; rostrum, I ; tarsi, I ; digito 

 medio, 1 poli. 

 Hab. Chile. 



Another specimen, which I take to be the young of the above, has 

 an undefined white line passing from eye to eye round the back of 

 the head, the whole upper surface barred and mottled irregularly 

 ■with ferruginous and blackish brown; cheeks and throat mottled 

 with soot-colour, barred on the breast in a similar manner to the 

 adult, -vvhich barring is almost lošt on the belly ; vent and thio-hs 

 white. ° 



* If the name Leptopus proves to liave been previously used, I \vould 

 propose Leplodactylus in its stcad. 



