128 Mr. C H. B. Grant on Birds collected in Argentina, 



A swamp-loving bird, where its peculiar cracking call 

 can be heard : in the Ajo district it is known as the " Hunco 

 cracker." 



The nest is a solid structure attached to two or more 

 stems of thick reeds, with entrance at the top side, the hole 

 being protected by an overlapping hood ; the nest is lined 

 with feathers, and three eggs appear to be the complete 

 clutch. 



111. Leptasthenura platensis. 



Leptasthenura (Bgithaloides Scl. Cat. B. xv. p. 35 (part.) ; 

 Arg. Orn. i. p. 177. 



Leptasthenura platensis Sharpe, Hand-1. B. iii. p. 53. 



a. S ad. Los Ynglases, Ajo. Oct. 29, 1908. 



b. S ad. „ „ Jan 18, 1909. 



c. ? ad. „ „ Feb. 3, 1909. 



d. S ad. „ „ Mar. 12, 1909. 

 €. S ad. „ „ Apr. 19, 1909. 

 /. c? ad. „ „ June 9, 1909. 



Irides hazel ; bill blackish, pearly at base of lower 

 mandible ; legs and toes olive-green. 



The October bird is much worn, and the January, February, 

 and March birds are moulting; the April specimen, except 

 for the tail, being in full feather. 



Not a common species in the Ajo district, and frequenting 

 the Tala woods ; in habits it much resembles the Tits. 



112. Synallaxis frontalis. 



Synallaxis frontalis Scl. Cat. B. xv. p. 39; Chubb, Ibis, 

 1910, p. 524 (Paraguay). 



a. S ad. Villa Oliva, Paraguay. Aug. 11, 1909. 



b. $ ad. Puerto Pinasco, „ Sept. 7, 1909. 



c. c? ad. Pan de Azucar, Brazil. Sept. 20, 1909. 



rf, e. (J ? ad. Near Villa Franca, Paraguay. Nov. 6, 1909. 



Irides amber; bill slate-coloured, upper mandible darker; 

 legs and toes dark olive-green. 



All the specimens are shewing signs of wear, especially 

 the November birds. The female taken in November was 

 sitting. 



