( 3G5 ) 



quite adnlt, oLtaiued by H. Wliitely, jr., in Briti.sli Guiana at tiie following localities: 

 Rio Cavimang, R. Takutu, Onnimee aud Bartica Grove. They bad been referred by 

 Dr. iSelater partly to S. mcxicanus, partly to S. caudacutus. 



After comparing these eleven skins with some thirty specimens of <S'. mexicanus, 

 I have come to the conclusion that S. nijij/i.daris is a perfectly distinct, though 

 nearly allied, species. I at first thought it might be a geographical race of 

 S. mcxicanus ; but snch cannot be the case, as true .S'. mexicanus also is found in 

 some of the localities where jS'. nifigidaris is met with. For instance, the British 

 Museum has an adult S from Ournmee, British Guiana, and a specimen from the 

 Capim Kiver (coll. Wallace) which 1 am unable to distinguish from several ( Central 

 American skins. On the other hand, among the large number of skius from Mexico, 

 Nicaragua, Costa Rica, etc., I never found any specimen approaching the form 

 here called S. nijiijidaris. 



All the eleven specimens dilfer from S. maxicanus in their much weaker 

 and shorter bills and in having the throat of a decidedly brighter and clearer 

 rufous. In <S'. m. mcxicanus and S. m. obscurior Hart, the young birds have the bill 

 (juite as long and stout as the adults. 



For the sake of comparison I append the measurements of the three forms : 



29 <S. m. mexicanus from Central America, bill 22 — 25J mm. 



5 S. m. obscurior from N.W. Ecuador, bill 22 — 241 mm. 



11 -S'. rujigularis, 17 — 19^ mm. 



47. Synallaxis omissa Hart. 



SynallKxU iimUsa Hartert, liiiU. Brit, Oni. CI. xi. (Juue I'JOl) p. 71 (Panl). 

 Sijnalla.ris ridilans (ucc Teinm.) Sclator li Salvin, P. Z. S. 18(37. p. bli (Para). 



1 6 juv. from Prata, 14. si. 1005. No. 121. " Iris brown." Wing 63; tail OS; 

 bill 13i mm. 



This specimen is a young bird, as shown by tlie llntfy structure of the feathers 

 on the rump, and diifers from the type in having the head and mantle of a more 

 brownish hue, the sides of the neck strongly, the chest and the sides of the body 

 slightly washed with ferruginous, and the quills outwardly margined with the same 

 colour. The blackish throat-])atch is rather smaller, and the under wing-coverts 

 are narrowly tipped with orange. The tail is uniformly dull blackish, as in the 

 type specimen. The specimen collected by ^V^allace and recorded s. n. S. rutilans 

 by Sclater & Salvin, is an immature bird of the present species. 



<S'. omissa is jjeculiar to the district of Para. 



48. Automolus infuscatus paraensis Hart. 



Cf. iVrji). Zool. xii. (1905) p. 279. 



1 ? ad. and 1 adnlt bird not sexed, from Prata, 23. x., 17. xi. 05. Nos. 2, 

 145. Iris marked as " greyish white "' (No. 2) and " brown " (No. 145). 



These examples fully confirm the differences stated in my former article. 



49. Philydor erythrocercus (Pelz.) 



Cf. A'.-f. ZwA. xii. (1905) p. 280. 



A single i ad. from Prata, 28. x. o5. No. 37. " Iris Ijrown." 



